View source for Pesticide

{{short description|Substance used to destroy pests}}
{{cs1 config|name-list-style=vanc|display-authors=6}}

{{use mdy dates|cs1-dates=sy|date=December 2023}}
{{use American English|date=December 2016}}
[[File:Lite-Trac Crop Sprayer.jpg|thumb|A self-propelled crop sprayer spraying pesticide on a field]]
[[File:Cropduster spraying pesticides.jpg|thumb|A [[crop-duster]] spraying pesticide on a field]]
'''Pesticides''' are substances that are used to [[pest control|control]] [[pest (organism)|pests]].<ref>{{cite web |url=https://www.epa.gov/ingredients-used-pesticide-products/basic-information-about-pesticide-ingredients |title=Basic Information about Pesticide Ingredients |date=April 2, 2018 |publisher=[[United States Environmental Protection Agency|Environmental Protection Agency]] |language=en |access-date=2018-12-01}}</ref> They include [[herbicide]]s, [[insecticide]]s, [[nematicide]]s, [[fungicide]]s, and many others (see table).<ref>{{cite book |chapter-url=https://www.nasda.org/foundation/pesticide-applicator-certification-and-training |title=National Pesticide Applicator Certification Core Manual |vauthors=Randall C, Hock W, Crow E, Hudak-Wise C, Kasai J |publisher=[[National Association of State Departments of Agriculture]] Research Foundation |year=2014 |edition=2nd |location=Washington |chapter=Pest Management |access-date=2018-12-01 |archive-date=2019-12-10 |archive-url=https://web.archive.org/web/20191210080506/https://www.nasda.org/foundation/pesticide-applicator-certification-and-training}}</ref> The most common of these are herbicides, which account for approximately 50% of all pesticide use globally.<ref>{{cite web |url=https://www.epa.gov/sites/default/files/2017-01/documents/pesticides-industry-sales-usage-2016_0.pdf |title=Pesticide Industry Sales and Usage, 2008 – 2012 Market Estimates |website=EPA |access-date=17 February 2023}}</ref> Most pesticides are used as plant protection products (also known as crop protection products), which in general protect plants from [[weed]]s, fungi, or [[insect]]s. 

In general, a pesticide is a [[Chemical substance|chemical]] or [[biological agent]] (such as a [[virus]], [[bacterium]], or [[entomopathogenic fungus|fungus]]) that deters, incapacitates, kills, or otherwise discourages pests. Target pests can include insects, plant [[pathogen]]s, weeds, [[mollusca|molluscs]], [[bird]]s, [[mammal]]s, [[fish]], [[nematode]]s (roundworms), and [[microbe]]s that destroy property, cause nuisance, spread disease, or are disease [[Vector (epidemiology)|vectors]]. Pesticides thus increase [[Crop yield|agricultural yields]]. Along with these benefits, pesticides also have drawbacks, such as [[Pesticide poisoning|potential toxicity]] to humans and other species.

{{TOC limit|3}}

==Definition==
{| class="wikitable floatright" style = "text-align:center"
|-
!Type of pesticide
!Target pest group
|-		
| [[Algicide]]s or [[algaecide]]s || [[Algae]]
|-
| [[Avicide]]s || [[Bird]]s
|-	
| [[Bactericide]]s || [[Bacteria]]
|-	
| [[Fungicide]]s || [[Fungus|Fungi]] and [[oomycete]]s
|-
| [[Herbicide]]s || [[Plant]]
|-	
| [[Insecticide]]s || [[Insect]]s
|-	
| [[Lampricide]]s || [[Lamprey]]s<ref name="Dunlop-et-al-2018">{{cite journal |last1=Dunlop |first1=Erin S. |last2=McLaughlin |first2=Rob |last3=Adams |first3=Jean V. |last4=Jones |first4=Michael |last5=Birceanu |first5=Oana |last6=Christie |first6=Mark R. |last7=Criger |first7=Lori A. |last8=Hinderer |first8=Julia L.M. |last9=Hollingworth |first9=Robert M. |last10=Johnson |first10=Nicholas S. |last11=Lantz |first11=Stephen R. |last12=Li |first12=Weiming |last13=Miller |first13=James |last14=Morrison |first14=Bruce J. |last15=Mota-Sanchez |first15=David |year=2018 |title=Rapid evolution meets invasive species control: the potential for pesticide resistance in sea lamprey |journal=[[Canadian Journal of Fisheries and Aquatic Sciences]] |publisher=[[National Research Council Canada]] |volume=75 |issue=1 |pages=152–168 |doi=10.1139/cjfas-2017-0015 |issn=0706-652X |hdl-access=free |last16=Muir |first16=Andrew |last17=Sepúlveda |first17=Maria S. |last18=Steeves |first18=Todd |last19=Walter |first19=Lisa |last20=Westman |first20=Erin |last21=Wirgin |first21=Isaac |last22=Wilkie |first22=Michael P. |bibcode=2018CJFAS..75..152D |hdl=1807/78674}}</ref>
|-	
| [[Miticide]]s or [[acaricide]]s || [[Mite]]s
|-	
| [[Molluscicide]]s || [[Snail]]s
|-	
| [[Nematicide]]s || [[Nematode]]s
|-
| [[Rodenticide]]s || [[Rodent]]s
|-
| [[Slimicide]]s || [[Algae]], [[Bacteria]], [[Fungi]], and [[Slime mold]]s
|-
| [[Virucide]]s || [[Virus]]es
|}

The word pesticide derives from the Latin ''pestis'' (plague) and ''caedere'' (kill).<ref>{{Cite book |last=Sykes |first=J. B. |title=The Concise Oxford dictionary of current english |publisher=Oxford University Press |year=1989 |isbn=978-0-19-861131-8 |oclc=848516593 |edition=7th}}</ref>

The [[Food and Agriculture Organization]] (FAO) has defined ''pesticide'' as:
: any substance or mixture of substances intended for preventing, destroying, or controlling any pest, including vectors of human or animal disease, unwanted species of plants or animals, causing harm during or otherwise interfering with the production, processing, storage, transport, or marketing of food, agricultural commodities, wood and wood products or animal feedstuffs, or substances that may be administered to animals for the control of insects, arachnids, or other pests in or on their bodies. The term includes substances intended for use as a plant growth regulator, defoliant, desiccant, or agent for thinning fruit or preventing the premature fall of fruit. Also used as substances applied to crops either before or after harvest to protect the commodity from deterioration during storage and transport.<ref name=code />

=== Classifications ===
Pesticides can be classified by target [[organism]] (e.g., [[herbicide]]s, [[insecticide]]s, [[fungicide]]s, [[rodenticide]]s, and [[pediculicide]]s – see table),<ref>{{Cite web |title=Types of pesticides |url=http://npic.orst.edu/ingred/ptype/index.html |access-date=January 4, 2024 |website=National Pesticide Information Center}}</ref>

[[Biopesticide]]s according to the [[United States Environmental Protection Agency|EPA]] include microbial pesticides, biochemical pesticides, and plant-incorporated protectants.<ref name=":11">{{Cite web |url=https://www.epa.gov/ingredients-used-pesticide-products/types-pesticide-ingredients |title=Types of Pesticide Ingredients |date=Jan 3, 2017 |website=US Environmental Protection Agency |language=en |access-date=Dec 1, 2018}}</ref>

Pesticides can be classified into structural classes, with many structural classes developed for each of the target organisms listed in the table. A structural class is usually associated with a single [[mode of action]], whereas a mode of action may encompass more than one structural class.

The pesticidal chemical ([[active ingredient]]) is mixed ([[Pesticide formulation|formulated]]) with other components to form the product that is sold, and which is [[Pesticide application|applied]] in various ways. Pesticides in gas form are [[Fumigation|fumigants]].

Pesticides can be classified based upon their [[mode of action]], which indicates the exact biological mechanism which the pesticide disrupts. The modes of action are important for [[Pesticide resistance|resistance]] management, and are categorized and administered by the [[Insecticide Resistance Action Committee|insecticide]], [[Herbicide Resistance Action Committee|herbicide]], and [[Fungicide Resistance Action Committee|fungicide]] resistance action committees.

Pesticides may be systemic or non-systemic.<ref>{{Cite journal |last1=Zhang |first1=Yu |last2=Lorsbach |first2=Beth A. |last3=Castetter |first3=Scott |last4=Lambert |first4=William T. |last5=Kister |first5=Jeremy |last6=Wang |first6=Nick X. |last7=Klittich |first7=Carla J. R. |last8=Roth |first8=Joshua |last9=Sparks |first9=Thomas C. |last10=Loso |first10=Mike R. |date=2018 |title=Physicochemical property guidelines for modern agrochemicals |doi=10.1002/ps.5037 |journal=Pest Management Science |volume=74 |issue=9 |pages=1979–1991|pmid=29667318 |bibcode=2018PMSci..74.1979Z |s2cid=4937939 }}</ref><ref>{{Cite journal |last=Hofstetter |first=Sandro |date=2018 |title=How To Design for a Tailored Subcellular Distribution of Systemic Agrochemicals in Plant Tissues |doi=10.1021/acs.jafc.8b02221 |journal=J. Agric. Food Chem. |volume=66 |issue=33 |pages=8687–8697|pmid=30024749 |bibcode=2018JAFC...66.8687H |s2cid=261974999 |url=https://backend.orbit.dtu.dk/ws/files/167227061/Rev_Hofstetter_et_al_intracellular_localization_of_agrochemicals.pdf }}</ref> A systemic pesticide moves (translocates) inside the plant. Translocation may be upward in the [[xylem]], or downward in the [[phloem]] or both. Non-systemic pesticides (contact pesticides) remain on the surface and act through direct contact with the target organism. Pesticides are more effective if they are systemic. Systemicity is a prerequisite for the pesticide to be used as a seed-treatment.

Pesticides can be classified as [[Persistent organic pollutant|persistent]] (non-biodegradable) or non-persistent ([[Biodegradation|biodegradable]]). A pesticide must be persistent enough to kill or control its target but must degrade fast enough not to accumulate in the [[Environmental impact of pesticides|environment]] or the [[Biomagnification|food chain]] in order to be approved by the authorities.<ref name=":7" /><ref name=":8" /> Persistent pesticides, including [[DDT]], were [[Stockholm Convention on Persistent Organic Pollutants|banned many years ago]], an exception being spraying in houses to combat [[malaria]] [[Vector control|vectors]].<ref name=":9">{{cite web |date=September 16, 2006 |title=WHO urges DDT for malaria control Strategies |url=http://www.commondreams.org/headlines06/0916-05.htm |archive-url=https://web.archive.org/web/20061017195527/http://www.commondreams.org/headlines06/0916-05.htm |archive-date=October 17, 2006 |access-date=September 15, 2007 |website=Common Dreams News Center |publisher=Inter Press Service |vauthors=Lobe J}}</ref>

== History ==
From ancient times until the 1950s the pesticides used were [[Inorganic compound|inorganic]] compounds and [[Extract|plant extracts]].<ref name=":4">{{Cite book |last=Mathews |first=Graham A. |title=A history of pesticides |publisher=CABI |year=2018 |isbn=978-1-78639-487-3 |location=Wallingford, Oxfordshire, UK}}</ref><ref name=":18">{{Cite book |url=https://www.unep.org/resources/report/environmental-and-health-impacts-pesticides-and-fertilizers-and-ways-minimizing |title=Environmental and Health Impacts of Pesticides and Fertilizers and Ways of Minimizing Them. Envisioning A Chemical-Safe World |publisher=United Nations Environment Programme [UNEP] |year=2022 |chapter=Chapter 2. Status and trends of pesticide use |chapter-url=https://wedocs.unep.org/bitstream/handle/20.500.11822/40351/Pesticides_Ch2.pdf}}</ref> The inorganic compounds were derivatives of [[Bordeaux mixture|copper]], [[Paris green|arsenic]], mercury, [[sulfur]], among others, and the plant extracts contained [[pyrethrum]], [[nicotine]], and [[rotenone]] among others. The less toxic of these are still in use in [[organic farming]]. In the 1940s the insecticide [[DDT]], and the herbicide [[2,4-Dichlorophenoxyacetic acid|2,4-D]], were introduced. These synthetic [[organic compound]]s were widely used and were very profitable. They were followed in the 1950s and 1960s by numerous other synthetic pesticides, which led to the growth of the pesticide industry.<ref name=":4" /><ref name=":18" /> During this period, it became increasingly evident that DDT, which had been sprayed widely in the environment to combat the vector, had [[Biomagnification|accumulated]] in the [[food chain]]. It had become a global pollutant, as summarized in the well-known book [[Silent Spring]]. Finally, DDT was banned in the 1970s in several countries, and subsequently all persistent pesticides were banned worldwide, an exception being spraying on interior walls for vector control.<ref name=":9" />

Resistance to a pesticide was first seen in the 1920s with inorganic pesticides,<ref name=":4" /> and later it was found that development of resistance is to be expected, and measures to delay it are important. [[Integrated pest management]] (IPM) was introduced in the 1950s. By careful analysis and spraying only when an economical or biological threshold of crop damage is reached, pesticide application is reduced. This became in the 2020s the official policy of international organisations, industry, and many governments.<ref name=":18" /> With the introduction of high yielding varieties in the 1960s in the [[Green Revolution|green revolution]], more pesticides were used.<ref name=":18" /> Since the 1980s [[genetically modified crops]] were introduced, which resulted in lower amounts of insecticides used on them.<ref name=":18" /> [[Organic farming|Organic]] agriculture, which uses only non-synthetic pesticides, has grown and in 2020 represents about 1.5 per cent of the world's total agricultural land.<ref name=":18" />

Pesticides have become more effective. Application rates fell from 1,000 to 2,500 grams of active ingredient per hectare (g/ha) in the 1950s to 40–100 g/ha in the 2000s.<ref name=":18" /> Despite this, amounts used have increased. In high income countries over 20 years between the 1990s and 2010s amounts used increased 20%, while in the low income countries amounts increased 1623%.<ref name=":18" />

== Development of new  pesticides ==
The aim is to find new compounds or agents with improved properties such as a new [[mode of action]] or lower application rate. Another aim is to replace older pesticides which have been banned for reasons of [[Health effects of pesticides|toxicity]] or [[Environmental impact of pesticides|environmental harm]] or have become less effective due to development of [[Pesticide resistance|resistance]].<ref name=":15">{{Cite journal |last=Umetsu |first=Noriharu |date=May 2020 |title=Development of novel pesticides in the 21st century |journal=Journal of Pesticide Science |volume=45 |issue=2 |pages=54–74 |doi=10.1584/jpestics.D20-201 |pmid=33132734 |pmc=7581488}}</ref><ref>{{Cite journal |last=Sparks |first=Thomas C. |date=2021 |title=Crop protection compounds - trends and perspective |journal=Pest Management Science |volume=77 |issue=8 |pages=3608–3616|doi=10.1002/ps.6293 |pmid=33486823 |bibcode=2021PMSci..77.3608S |s2cid=231704006}}</ref><ref>{{Cite web |last=Ling |first=Kenneth |date=2014 |title=Discovery of Agrochemicals |website=Oxford University |url=http://www.oxfordsynthesiscdt.ox.ac.uk/resources/SBM-CDT-Agrochemistry.pdf |access-date=13 December 2023}}</ref><ref name="Bebber-Gurr-2015">{{cite journal |last1=Bebber |first1=Daniel P. |last2=Gurr |first2=Sarah J. |year=2015 |title=Crop-destroying fungal and oomycete pathogens challenge food security |journal=[[Fungal Genetics and Biology]] |publisher=[[Academic Press]] |volume=74 |pages=62–64 |doi=10.1016/j.fgb.2014.10.012 |issn=1087-1845 |pmid=25459533}}</ref>

The process starts with testing (screening) against target organisms such as [[Insecticide|insects]], [[Fungicide|fungi]] or [[Herbicide|plants]]. Inputs are typically random compounds, [[natural product]]s,<ref>{{Cite journal |last=Sparks |first=Thomas C. |date=2023 |title=Natural Product-Based Crop Protection Compounds─Origins and Future Prospects |journal=Journal of Agricultural and Food Chemistry |volume=71 |issue=5 |pages=2259–2269 |doi=10.1021/acs.jafc.2c06938 |pmid=36693160 |bibcode=2023JAFC...71.2259S |s2cid=256230724}}</ref> compounds designed to disrupt a biochemical target, compounds described in patents or literature, or [[Biopesticide|biocontrol]] organisms.

Compounds that are active in the screening process, known as hits or leads, cannot be used as pesticides, except for biocontrol organisms and some potent natural products. These lead compounds need to be [[Lead optimization|optimised]] by a series of cycles of synthesis and testing of analogs. For approval by [[Pesticide regulation in the United States|regulatory authorities]] for use as pesticides, the optimized compounds must meet several requirements.<ref name=":7">{{Cite web |date=January 25, 2023 |title=About Pesticide Registration |url=https://www.epa.gov/pesticide-registration/about-pesticide-registration#registration |access-date=13 December 2023 |website=Environmental Protection Agency}}</ref><ref name=":8">{{Cite web |title=Approval of active substances |publisher=[[European Commission]] |url=https://food.ec.europa.eu/plants/pesticides/approval-active-substances_en |access-date=13 December 2023}}</ref> In addition to being potent (low application rate), they must show low toxicity to non-target organisms, low environmental impact, and viable manufacturing cost. The cost of developing a pesticide in 2024 was estimated to be 301 million US dollars.<ref>{{Cite web |date=February 2024 |title=Time and Cost of New Agrochemical Product Discovery, Development and Registration. A Study on Behalf of Crop Life International. |url=https://agbioinvestor.com/new-agrochemical-product-study/ |access-date=21 August 2025 |website=agbioinvestor.com}}</ref> It has become more difficult to find new pesticides. More than 100 new active ingredients were introduced in the 2000s and less than 40 in the 2010s.<ref name=":18" /> [[Biopesticide]]s are cheaper to develop, since the authorities require less toxicological and environmental study. Since 2000 the rate of new biological product introduction has frequently exceeded that of conventional products.<ref name=":18" />

More than 25% of existing chemical pesticides contain one or more [[Chirality (chemistry)|chiral]] centres (stereogenic centres).<ref name="Ulrich-et-al-2012">{{cite book |last1=Ulrich |first1=Elin M. |last2=Morrison |first2=Candice N. |last3=Goldsmith |first3=Michael R. |last4=Foreman |first4=William T. |title=Reviews of Environmental Contamination and Toxicology |chapter=Chiral Pesticides: Identification, Description, and Environmental Implications |publisher=[[Springer US]] |year=2012 |isbn=978-1-4614-2328-7 |volume=217 |publication-place=[[Boston]] |pages=1–74 |doi=10.1007/978-1-4614-2329-4_1 |issn=0179-5953 |pmid=22350557}} {{small|(WTF [[ResearcherID|RID]]: [http://researcherid.com/rid/N-2573-2016 N-2573-2016])}}.</ref> Newer pesticides with lower application rates tend to have more complex structures, and thus more often contain chiral centres.<ref name="Ulrich-et-al-2012" /> In cases when most or all of the pesticidal activity in a new compound is found in one [[enantiomer]] (the [[Eudysmic ratio|eutomer]]), the registration and use of the compound as this single enantiomer is preferred. This reduces the total application rate and avoids the tedious environmental testing required when registering a racemate.<ref>{{Cite journal |last=Bura |first=László |title= Guidance of EFSA on risk assessments for active substances of plant protection products that have stereoisomers as components or impurities and for transformation products of active substances that may have stereoisomers|journal= EFSA Journal|date=2019 |volume=17 |issue=8 |pages=e05804 |doi=10.2903/j.efsa.2019.5804 |pmid=32626414 |pmc=7009100 |doi-access=free}}</ref><ref>{{Cite web |date=26 October 2000 |title=Interim Policy for Evaluation of Stereoisomeric Pesticides |url=https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/interim-policy-evaluation-stereoisomeric-pesticides |access-date=4 December 2023 |website=U.S. Environmental Protection Agency}}</ref> However, if a [[Manufacturing cost|viable]] [[Enantioselective synthesis|enantioselective manufacturing route]] cannot be found, then the [[Racemic mixture|racemate]] is registered and used.

==Uses==
[[File:Pesticide use (2023).svg|thumb|Pesticide use worldwide, by country in 2023<ref>{{Cite book |last=FAO |url=https://openknowledge.fao.org/handle/20.500.14283/cd4313en |title=World Food and Agriculture – Statistical Yearbook 2025 |date=2025 |publisher=FAO |isbn=978-92-5-140174-3 |language=English |doi=10.4060/cd4313en}}</ref>]]
In addition to their main use in [[agriculture]], pesticides have a number of other applications. Pesticides are used to control organisms that are considered to be harmful, or pernicious to their surroundings.<ref name="purdue">{{Cite book |url=https://www.extension.purdue.edu/extmedia/ppp/ppp-70.pdf |title=The Benefits of Pesticides, A Story Worth Telling |last=Whitford |first=F. |publisher=Purdue Extension |year=2009}}</ref> For example, they are used to kill [[mosquitoes]] that can transmit potentially deadly diseases like [[West Nile virus]], [[yellow fever]], and [[malaria]]. They can also kill [[bee]]s, [[wasp]]s or [[ant]]s that can cause allergic reactions. Insecticides can protect animals from illnesses that can be caused by [[parasitism|parasites]] such as [[flea]]s.<ref name="purdue"/> Pesticides can prevent sickness in humans that could be caused by [[Mold (fungus)|mold]]y food or diseased produce. Herbicides can be used to clear roadside weeds, trees, and brush. They can also kill invasive [[weed]]s that may cause environmental damage. Herbicides are commonly applied in ponds and lakes to control [[algae]] and plants such as water grasses that can interfere with activities like swimming and fishing and cause the water to look or smell unpleasant.<ref name="VCE">{{Cite web |url=http://www.ext.vt.edu/pubs/waterquality/420-013/420-013.html |title=Pesticides and aquatic animals: A guide to reducing impacts on aquatic systems |vauthors=Helfrich LA, Weigmann DL, Hipkins P, Stinson ER |date=Jun 1996 |website=Virginia Cooperative Extension |archive-url=https://web.archive.org/web/20090305060503/http://www.ext.vt.edu/pubs/waterquality/420-013/420-013.html |archive-date=March 5, 2009 |access-date=Oct 14, 2007}}</ref> Uncontrolled pests such as termites and mold can damage structures such as houses.<ref name="purdue"/> Pesticides are used in grocery stores and food storage facilities to manage [[rodents]] and insects that infest food such as grain. Pesticides are used on [[lawn]]s and [[golf course]]s, partly for cosmetic reasons.<ref name=":17">{{Cite journal |vauthors=Robbins P |date=2003 |title=The Lawn-Chemical Economy and Its Discontents |journal=Antipode |volume=35 |issue=5 |pages=955–979 |bibcode=2003Antip..35..955R |doi=10.1111/j.1467-8330.2003.00366.x |s2cid=154002130}}</ref>

[[Integrated pest management]], the use of multiple approaches to control pests, is becoming widespread and has been used with success in countries such as [[Indonesia]], [[China]], [[Bangladesh]], the U.S., [[Australia]], and [[Mexico]].<ref name="sustaining" /> IPM attempts to recognize the more widespread impacts of an action on an [[ecosystem]], so that natural balances are not upset.<ref name=":1">{{Cite book |title=Introduction to insect biology and diversity |vauthors=Daly HV, Doyen JT, Purcell AH |date=1998 |publisher=Oxford University Press |isbn=978-0-19-510033-4 |edition=2nd |location=Oxford |pages=279–300 |chapter=Chapter 14 |oclc=37211384}}</ref>

Each use of a pesticide carries some associated risk. Proper pesticide use decreases these associated risks to a level deemed acceptable by pesticide regulatory agencies such as the [[United States Environmental Protection Agency]] (EPA) and the [[Pest Management Regulatory Agency]] (PMRA) of Canada.

[[DDT]], sprayed on the walls of houses, is an organochlorine that has been used to fight [[malaria]] vectors (mosquitos) since the 1940s. The [[World Health Organization]] recommend this approach.<ref>{{Cite web |website=[[World Health Organization|WHO]] |url=https://www.who.int/mediacentre/news/releases/2006/pr50/en/ |title=WHO gives indoor use of DDT a clean bill of health for controlling malaria |date=Sep 15, 2006 |archive-url=https://web.archive.org/web/20060921220230/http://www.who.int/mediacentre/news/releases/2006/pr50/en/ |archive-date=Sep 21, 2006 |access-date=Sep 13, 2007}}</ref> It and other organochlorine pesticides have been [[Stockholm Convention on Persistent Organic Pollutants|banned]] in most countries worldwide because of their persistence in the environment and human toxicity. DDT has become less effective, as [[Pesticide resistance|resistance]] was identified in Africa as early as 1955, and by 1972 nineteen species of mosquito worldwide were resistant to DDT.<ref>{{cite web |title=In Depth: DDT & Malaria |url=http://magazine.panna.org/summer2006/inDepthDDT.html |work=PAN Magazine |archive-url=https://web.archive.org/web/20080118043120/http://magazine.panna.org/summer2006/inDepthDDT.html |archive-date=2008-01-18}}</ref><ref>{{cite web |title=A Story to be Shared: the Successful Fight Against Malaria in Vietnam |date=Nov 6, 2000 |url=http://www.afronets.org/files/malaria.pdf |publisher=WHO WPRO |archive-url=https://web.archive.org/web/20031005062640/http://www.afronets.org/files/malaria.pdf |archive-date=Oct 5, 2003}}</ref>

==Amount used==
[[File:Pesticide use by region-.svg|thumb|Pesticide use by region<ref>{{Cite book |last=FAO |url=https://openknowledge.fao.org/handle/20.500.14283/cd4313en |title=World Food and Agriculture – Statistical Yearbook 2025 |date=2025 |publisher=FAO |isbn=978-92-5-140174-3 |language=English |doi=10.4060/cd4313en}}</ref>]]
Total pesticides use in agriculture in 2021 was 3.54 million tonnes of active ingredients (Mt), a 4 percent increase with respect to 2020, an 11 percent increase in a decade, and a doubling since 1990. Pesticides use per area of cropland in 2021 was 2.26&nbsp;kg per hectare (kg/ha), an increase of 4 percent with respect to 2020; use per value of agricultural production was 0.86&nbsp;kg per thousand [[international dollar]] (kg/1000 I$) (+2%); and use per person was 0.45&nbsp;kg per capita (kg/cap) (+3%). Between 1990 and 2021, these indicators increased by 85 percent, 3 percent, and 33 percent, respectively. Brazil was the world's largest user of pesticides in 2021, with 720 kt of pesticides applications for agricultural use, while the USA (457 kt) was the second-largest user.<ref name=":16">{{Cite web |date=2023 |title=Pesticides use and trade 1990–2021 |url=https://www.fao.org/3/cc6958en/cc6958en.pdf |access-date=January 15, 2024 |website=Food and agricultural organisation of the united nations}}</ref><ref name=":14">{{Cite book |url=https://www.fao.org/documents/card/en?details=cc8166en |title=World Food and Agriculture – Statistical Yearbook 2023 |date=2023 |publisher=Food and Agriculture Organization of the United Nations |isbn=978-92-5-138262-2 |location=Rome, Italy |language=en |doi=10.4060/cc8166en |access-date=2023-12-13 |via=FAODocuments}}</ref>

Applications per cropland area in 2021 varied widely, from 10.9&nbsp;kg/[[hectare]] in Brazil to 0.8&nbsp;kg/ha in the Russian Federation. The level in Brazil was about twice as high as in Argentina (5.6&nbsp;kg/ha) and Indonesia (5.3&nbsp;kg/ha).<ref name=":16" /> Insecticide use in the US has declined by more than half since 1980 (0.6%/yr), mostly due to the near phase-out of [[organophosphate]]s. In corn fields, the decline was even steeper, due to the switchover to [[transgenic]] [[Bt corn]].<ref name=s730>{{cite journal |title=Infographic: Pesticide Planet |journal=Science |volume=341 |issue=6147 |pages=730–1 |date=August 2013 |bibcode=2013Sci...341..730. |pmid=23950524 |doi=10.1126/science.341.6147.730}}</ref>

==Benefits==
Pesticides increase agricultural yields.<ref>{{Cite book |title=Agricultural Productivity. Studies in Productivity and Efficiency |veditors=Ball VE, Norton GW |vauthors=Kellogg RL, Nehring RF, Grube A, Goss DW, Plotkin S |date=2002 |volume=2 |pages=213–56 |chapter=Environmental Indicators of Pesticide Leaching and Runoff from Farm Fields |location=Boston |chapter-url=https://www.nrcs.usda.gov/Technical/land/pubs/eip_pap.html |publisher=Springer |isbn=978-1-4613-5270-9 |archive-url=https://web.archive.org/web/20020618151910/http://www.nrcs.usda.gov/Technical/land/pubs/eip_pap.html |archive-date=June 18, 2002}}</ref> Median yield increases range between 12% and 27% when pesticides are used, depending on the crop.<ref>{{cite journal |url=https://onlinelibrary.wiley.com/doi/abs/10.1002/ps.6782 |title=Yield to the data: some perspective on crop productivity and pesticides |date=November 2009 |journal=Pest Management Science |volume=78 |issue=5 |pages=1765–1771 |doi=10.1002/ps.6782 |language=en| vauthors = Washuck N, Hanson M, Prosser R |pmid=34995003 |url-access=subscription }}</ref> Another study found that not using pesticides reduced crop yields by about 10%.<ref>{{Cite journal |vauthors=Saitoh K, Kuroda T, Kumano S |date=2001 |title=Effects of Organic Fertilization and Pesticide Application on Growth and Yield of Field-Grown Rice for 10 Years |journal=Japanese Journal of Crop Science |language=ja |volume=70 |issue=4 |pages=530–540 |doi=10.1626/jcs.70.530 |doi-access=free}}</ref> A study conducted in 1999, found that a ban on pesticides in the United States may result in a rise of [[food prices]], loss of jobs, and an increase in world hunger.<ref>{{Cite journal| vauthors=Knutson R |date=1999 |title=Economic Impact of Reduced Pesticide Use in the United States: Measurement of Costs and Benefits |journal=AFPC Policy Issues |volume=99 |issue=2 |url=https://www.afpc.tamu.edu/research/publications/148/99-2.pdf |url-status=live |archive-date=2018-12-03 |archive-url=https://web.archive.org/web/20181203060027/https://www.afpc.tamu.edu/research/publications/148/99-2.pdf}}</ref>

There are two levels of benefits for pesticide use, primary and secondary. Primary benefits are direct gains from the use of pesticides and secondary benefits are effects that are more long-term.<ref name="Cooper" />

===Biological===
Controlling [[pest (organism)|pest]]s and plant disease vectors
*Improved [[crop yield]]s
*Improved crop/livestock quality
*[[Invasive species]] controlled

Controlling human/livestock [[disease vector]]s and nuisance organisms
*Human lives saved and disease reduced. Diseases controlled include malaria,<ref name="Cooper"/> with millions of lives having been saved or enhanced with the use of [[DDT]] alone.<ref>{{cite journal |vauthors=Yamey G |date=May 2004 |title=Roll Back Malaria: a failing global health campaign |journal=[[The BMJ|BMJ]] |volume=328 |issue=7448 |pages=1086–7 |doi=10.1136/bmj.328.7448.1086 |pmc=406307 |pmid=15130956}}</ref>
*Animal lives saved and disease reduced

Controlling organisms that harm other human activities and structures
*Drivers view unobstructed
*Tree/brush/leaf hazards prevented
*Wooden structures protected<ref name="Cooper" />

===Economics===
In 2018 world pesticide sales were estimated to be $65 billion, of which 88% was used for agriculture.<ref name=":18" /> Generic accounted for 85% of sales in 2018.<ref>{{Cite journal |last1=Mansfield |first1=Becky |last2=Werner |first2=Marion |last3=Berndt |first3=Christian |date=2024 |title=A new critical social science research agenda on pesticides |journal=Agriculture and Human Values|volume=41 |issue=2 |pages=395–412 |doi=10.1007/s10460-023-10492-w |doi-access=free }}</ref> In one study, it was estimated that for every dollar ($1) that is spent on pesticides for crops results in up to four dollars ($4) in crops which would otherwise be lost to insects, fungi and weeds.<ref name="Pimental1992">{{cite journal |vauthors=Pimentel D, Acquay H, Biltonen M, Rice P, Silva M |year=1992 |title=Environmental and Economic Costs of Pesticide Use |journal=BioScience |volume=42 |issue=10| pages=750–60 |jstor=1311994 |doi=10.2307/1311994}}</ref>  In general, farmers benefit from having an increase in crop yield and from being able to grow a variety of crops throughout the year. Consumers of agricultural products also benefit from being able to afford the vast quantities of produce available year-round.<ref name="Cooper">{{cite journal |vauthors=Cooper J, Dobson H |date=2007 |title=The benefits of pesticides to mankind and the environment |journal=Crop Protection |volume=26 |issue=9 |pages=1337–1348 |doi=10.1016/j.cropro.2007.03.022 |bibcode=2007CrPro..26.1337C |s2cid=84808730 |url=https://croplifefoundation.org/Documents/Research%20Briefs/PesticideBenefitsResearchPaper.pdf |archive-url= https://web.archive.org/web/20110927225454/https://croplifefoundation.org/Documents/Research%20Briefs/PesticideBenefitsResearchPaper.pdf |archive-date=September 27, 2011}}</ref>

==Disadvantages==
On the cost side of pesticide use there can be [[environmental damage|costs to the environment]] and costs to human health.<ref>{{cite journal |vauthors=Fantke P, Friedrich R, Jolliet O |title=Health impact and damage cost assessment of pesticides in Europe |journal=Environment International |volume=49 |pages=9–17 |date=November 2012 |pmid=22940502 |doi=10.1016/j.envint.2012.08.001|bibcode=2012EnInt..49....9F }}</ref> Pesticides safety education and pesticide applicator regulation are designed to protect the public from [[pesticide misuse]], but do not eliminate all misuse. Reducing the use of pesticides and choosing less toxic pesticides may reduce risks placed on society and the environment from pesticide use.<ref name="VCE" />

===Health effects===
{{Main|Health effects of pesticides}}

{{further|Pesticide poisoning|Environmental impact of pesticides #Humans|}}
[[File:Warning2Pesticides.jpg|thumb|A sign warning about potential pesticide exposure]]

Most health concerns related to pesticides stem from direct use, whether in occupational or non-occupational settings. In contrast, health risks from [[pesticide residue]]s in fruits and vegetables are considered minimal.

Occupational use of pesticides may affect health negatively.<ref>{{Cite web |url=http://www.epa.gov/oppfead1/safety/newnote/workshop3.htm |title=National Assessment of the Worker Protection Workshop #3 |date=Aug 30, 2007 |website=Pesticides: Health and Safety |publisher=U.S. [[United States Environmental Protection Agency|Environmental Protection Agency]] |archive-url=https://web.archive.org/web/20090927235545/http://www.epa.gov/oppfead1/safety/newnote/workshop3.htm |archive-date=September 27, 2009}}</ref><ref>{{Cite web |title=Occupational exposure to chemicals and hearing impairment |url=https://www.norskoljeoggass.no/globalassets/dokumenter/drift/arbeidsmiljo/kjemisk-arbeidsmiljo/fagtema/horselsskadelige-kjemikalier/occupational-exposure-to-chemicals-and-hearing-impairment.pdf |website=norskoljeoggass.no |archive-url=https://web.archive.org/web/20200329205326/https://www.norskoljeoggass.no/globalassets/dokumenter/drift/arbeidsmiljo/kjemisk-arbeidsmiljo/fagtema/horselsskadelige-kjemikalier/occupational-exposure-to-chemicals-and-hearing-impairment.pdf |archive-date=2020-03-29 |url-status=live}}</ref> mimicking hormones causing reproductive problems, and also causing cancer.<ref>{{cite web |url=http://www.epa.gov/pesticides/health/human.htm |title=Human Health Issues |date=Jun 28, 2006 |website=Pesticides: Health and Safety |publisher=[[United States Environmental Protection Agency|US EPA]] |archive-url=https://web.archive.org/web/20150528144110/http://www.epa.gov/pesticides/health/human.htm |archive-date=May 28, 2015}}</ref> A 2007 [[systematic review]] found that "most studies on [[non-Hodgkin lymphoma]] and [[leukemia]] showed positive associations with pesticide exposure" and thus concluded that cosmetic use of pesticides should be decreased.<ref>{{cite journal |vauthors=Bassil KL, Vakil C, Sanborn M, Cole DC, Kaur JS, Kerr KJ |title=Cancer health effects of pesticides: systematic review |journal=Canadian Family Physician |volume=53 |issue=10 |pages=1704–11 |date=October 2007 |pmid=17934034 |pmc=2231435}}</ref> There is substantial evidence of associations between organophosphate insecticide exposures and neurobehavioral alterations.<ref name=":32">{{cite journal |last1=Jurewicz |first1=Joanna |last2=Hanke |first2=Wojciech |title=Prenatal and Childhood Exposure to Pesticides and Neurobehavioral Development: Review of Epidemiological Studies |journal=International Journal of Occupational Medicine and Environmental Health |volume=21 |issue=2 |pages=121–32 |year=2008 |pmid=18614459 |doi=10.2478/v10001-008-0014-z |doi-broken-date=July 1, 2025 |issn=1896-494X |url=http://oldwww.imp.lodz.pl/home_en/publishing_office/journals_/_ijomeh/&articleId=20947&l=PL |url-access=subscription }}</ref><ref>{{cite journal |vauthors=Weselak M, Arbuckle TE, Foster W |title=Pesticide exposures and developmental outcomes: the epidemiological evidence |journal=Journal of Toxicology and Environmental Health Part B: Critical Reviews |volume=10 |issue=1–2 |pages=41–80 |year=2007 |pmid=18074304 |doi=10.1080/10937400601034571 |bibcode=2007JTEHB..10...41W |s2cid=25304655}}</ref><ref>{{cite journal |vauthors=Wigle DT, Arbuckle TE, Turner MC, Bérubé A, Yang Q, Liu S, Krewski D |title=Epidemiologic evidence of relationships between reproductive and child health outcomes and environmental chemical contaminants |journal=Journal of Toxicology and Environmental Health Part B: Critical Reviews |volume=11 |issue=5–6 |pages=373–517 |date=May 2008 |pmid=18470797 |doi=10.1080/10937400801921320 |bibcode=2008JTEHB..11..373W |s2cid=33463851}}</ref><ref>{{cite journal |vauthors=Mink PJ, Mandel JS, Lundin JI, Sceurman BK |title=Epidemiologic studies of glyphosate and non-cancer health outcomes: a review |journal=[[Regulatory Toxicology and Pharmacology]] |volume=61 |issue=2 |pages=172–84 |date=November 2011 |pmid=21798302 |doi=10.1016/j.yrtph.2011.07.006}}</ref> Limited evidence also exists for other negative outcomes from pesticide exposure including neurological, [[birth defects]], and [[fetal death]].<ref>{{cite journal |vauthors=Sanborn M, Kerr KJ, Sanin LH, Cole DC, Bassil KL, Vakil C |title=Non-cancer health effects of pesticides: systematic review and implications for family doctors |journal=Canadian Family Physician |volume=53 |issue=10 |pages=1712–20 |date=October 2007 |pmid=17934035 |pmc=2231436}}</ref>

2014 epidemiological review found associations between autism and exposure to certain pesticides, but noted that the available evidence was insufficient to conclude that the relationship was causal.<ref>{{cite journal |vauthors=Kalkbrenner AE, Schmidt RJ, Penlesky AC |title=Environmental chemical exposures and autism spectrum disorders: a review of the epidemiological evidence |journal=Current Problems in Pediatric and Adolescent Health Care |volume=44 |issue=10 |pages=277–318 |date=November 2014 |pmid=25199954 |pmc=4855851 |doi=10.1016/j.cppeds.2014.06.001}}</ref>

Owing to inadequate regulation and safety precautions, 99% of pesticide-related deaths occur in developing countries that account for only 25% of pesticide usage.<ref name=":022">{{Cite report |title=Childhood Pesticide Poisoning: Information for Advocacy and Action |last=Goldmann |first=Lynn |date=May 2004 |url=https://www.who.int/ceh/publications/pestpoisoning.pdf |publisher=[[World Health Organization|WHO]] |archive-url=https://web.archive.org/web/20090517035747/https://www.who.int/ceh/publications/pestpoisoning.pdf |archive-date=2009-05-17}}</ref>

==== Exposure to pesticide residues from eating food ====
{{Main|Pesticide residue#Health impacts}}

According to the [[American Cancer Society]] there is no evidence that pesticide residues in food increase the risk of people getting cancer.<ref name="acs">{{cite web |publisher=[[American Cancer Society]] |url=http://www.cancer.org/healthy/eathealthygetactive/acsguidelinesonnutritionphysicalactivityforcancerprevention/acs-guidelines-on-nutrition-and-physical-activity-for-cancer-prevention-common-questions |archive-url=https://archive.today/20130414122451/http://www.cancer.org/healthy/eathealthygetactive/acsguidelinesonnutritionphysicalactivityforcancerprevention/acs-guidelines-on-nutrition-and-physical-activity-for-cancer-prevention-common-questions |archive-date=14 April 2013 |access-date=12 December 2015 |date=9 April 2015 |title=ACS Guidelines on Nutrition and Physical Activity for Cancer Prevention – Common questions about diet and cancer }}</ref> A 2009 study estimated that lifetime exposure to pesticide residues from eating fruits and vegetables results in only 4.2 and 3.2 minutes of lost life per person in Switzerland and the United States, respectively.<ref>{{cite journal |date=November 2009 |title=Life cycle human toxicity assessment of pesticides: comparing fruit and vegetable diets in Switzerland and the United States |journal=  Chemosphere|volume=77 |issue=7 |pages=939–945 |doi=10.1016/j.chemosphere.2009.08.006 |pmid=19729188 |bibcode=2009Chmsp..77..939J |language=en| vauthors = Juraske R, Mutel CL, Stoessel F, Hellweg S }}</ref>

==== Non-occupational pesticide use====
Pesticides are also found in majority of U.S. households with 88&nbsp;million out of the 121.1&nbsp;million households indicating that they use some form of pesticide in 2012.<ref name="EPAPesticides">{{cite web|url=https://www.epa.gov/sites/default/files/2017-01/documents/pesticides-industry-sales-usage-2016_0.pdf |archive-url=https://web.archive.org/web/20170417185628/https://www.epa.gov/sites/production/files/2017-01/documents/pesticides-industry-sales-usage-2016_0.pdf |archive-date=2017-04-17 |url-status=live |title=Pesticides Industry Sales and Usage 2008–2012 |date=2012 |publisher=US EPA |access-date=26 March 2012}}</ref><ref>{{cite web |url=https://www.statista.com/statistics/183635/number-of-households-in-the-us/ |title=U.S.: Number of households 1960–2017 |website=Statista |access-date=26 March 2018}}</ref> As of 2007, there were more than 1,055 active ingredients registered as pesticides,<ref name="Goldman 2007">{{cite journal |vauthors=Goldman LR |year=2007 |title=Managing pesticide chronic health risks: U.S. policies |journal=Journal of Agromedicine |volume=12 |issue=1 |pages=67–75 |doi=10.1300/J096v12n02_08 |pmid=18032337 |s2cid=216149465}}</ref> which yield over 20,000 pesticide products that are marketed in the United States.<ref name=":2">{{cite web |title=Pesticide Illness & Injury Surveillance |date=Feb 7, 2017 |website=CDC.gov |publisher=[[National Institute for Occupational Safety and Health|NIOSH]] |url=https://www.cdc.gov/niosh/topics/pesticides/ |access-date=Jan 28, 2014}}</ref>

The American Academy of Pediatrics recommends limiting exposure of children to pesticides and using safer alternatives:<ref>{{cite journal |last1=Roberts |first1=James R. |last2=Karr |first2=Catherine J. |collaboration=Council On Environmental Health |title=Pesticide exposure in children |journal=Pediatrics |volume=130 |issue=6 |pages=e1757–63 |date=December 2012 |pmid=23184103 |doi=10.1542/peds.2012-2757 |doi-access=free}}</ref>

One study found pesticide self-poisoning the method of choice in one third of suicides worldwide, and recommended, among other things, more restrictions on the types of pesticides that are most harmful to humans.<ref>{{cite journal |vauthors=Gunnell D, Eddleston M, Phillips MR, Konradsen F |title=The global distribution of fatal pesticide self-poisoning: systematic review |journal=BMC Public Health |volume=7 |issue=1 |article-number=357 |date=December 2007 |pmid=18154668 |pmc=2262093 |doi=10.1186/1471-2458-7-357 |doi-access=free}}</ref>

==== Pesticide use among agricultural workers ====
The World Health Organization and the [[UN Environment Programme]] estimate that 3&nbsp;million agricultural workers in the developing world experience severe [[Pesticide poisoning|poisoning from pesticides]] each year, resulting in 18,000 deaths.<ref name="sustaining"/> According to one study, as many as 25&nbsp;million workers in developing countries may suffer mild pesticide poisoning yearly.<ref>{{cite journal |vauthors=Jeyaratnam J |title=Acute pesticide poisoning: a major global health problem |journal=World Health Statistics Quarterly. Rapport Trimestriel de Statistiques Sanitaires Mondiales |volume=43 |issue=3 |pages=139–44 |year=1990 |pmid=2238694}}</ref> Other occupational exposures besides agricultural workers, including pet groomers, [[Groundskeeping|groundskeepers]], and [[Fumigation|fumigators]], may also put individuals at risk of health effects from pesticides.<ref name=":2"/>

Pesticide use is widespread in [[Latin America]], as around US$3&nbsp;billion are spent each year in the region. Records indicate an increase in the frequency of pesticide poisonings over the past two decades. The most common incidents of pesticide poisoning is thought to result from exposure to organophosphate and carbamate insecticides.<ref name=":12">{{Cite journal |vauthors=Laborde A, Tomasina F, Bianchi F, Bruné M, Buka I, Comba P, Corra L, Cori L, Duffert CM |date=2015 |title=Children's Health in Latin America: The Influence of Environmental Exposures |journal=Environmental Health Perspectives |volume=123 |issue=3 |pages=201–209 |doi=10.1289/ehp.1408292 |issn=0091-6765 |pmc=4348745 |pmid=25499717|bibcode=2015EnvHP.123..201L }}</ref> At-home pesticide use, use of unregulated products, and the role of undocumented workers within the agricultural industry makes characterizing true pesticide exposure a challenge. It is estimated that 50–80% of pesticide poisoning cases are unreported.

Underreporting of pesticide poisoning is especially common in areas where agricultural workers are less likely to seek care from a healthcare facility that may be monitoring or tracking the incidence of acute poisoning. The extent of unintentional pesticide poisoning may be much greater than available data suggest, particularly among developing countries. Globally, agriculture and food production remain one of the largest industries. In East Africa, the agricultural industry represents one of the largest sectors of the economy, with nearly 80% of its population relying on agriculture for income.<ref>{{Cite web|title=Agriculture & Food Security |website=www.eac.int |url=https://www.eac.int/agriculture#:~:text=The%20major%20food%20crops%20are,tobacco,%20coconut%20and%20cashew%20nuts.|access-date=2020-11-30}}</ref> Farmers in these communities rely on pesticide products to maintain high crop yields.

Some East Africa governments are shifting to [[corporate farming]], and opportunities for foreign conglomerates to operate commercial farms have led to more accessible research on pesticide use and exposure among workers. In other areas where large proportions of the population rely on subsistence, small-scale farming, estimating pesticide use and exposure is more difficult.

==== Pesticide poisoning ====
[[File:Cholinergic synapse-de.svg|thumb|The cholinergic synapse and the breakdown of [[acetylcholine]] into choline and acetate by acetylcholinesterase]]
Pesticides may exhibit toxic effects on [[Environmental impact of pesticides#Humans|humans]] and other non-target species, the severity of which depends on the frequency and magnitude of exposure. Toxicity also depends on the rate of absorption, distribution within the body, metabolism, and elimination of compounds from the body. Commonly used pesticides like organophosphates and carbamates act by inhibiting [[acetylcholinesterase]] activity, which prevents the breakdown of [[acetylcholine]] at the neural [[synapse]]. Excess acetylcholine can lead to [[Organophosphate poisoning#Signs and symptoms|symptoms]] like muscle cramps or tremors, confusion, dizziness and nausea. Studies show that farm workers in Ethiopia, Kenya, and Zimbabwe have decreased concentrations of plasma acetylcholinesterase, the enzyme responsible for breaking down acetylcholine acting on synapses throughout the [[nervous system]].<ref name=":13">{{Cite journal |last1=Mekonnen |first1=Yalemtsehay |last2=Ejigu |first2=D. |date=September 2005 |title=Plasma cholinesterase level of Ethiopian farm workers exposed to chemical pesticide |journal=Occupational Medicine (Oxford, England) |volume=55 |issue=6 |pages=504–505 |doi=10.1093/occmed/kqi088 |issn=0962-7480 |pmid=16140842 |doi-access=free}}</ref><ref name=":33">{{Cite journal|vauthors=Ohayo-Mitoko GJ, Kromhout H, Simwa JM, Boleij JS, Heederik D |date=2000 |title=Self reported symptoms and inhibition of acetylcholinesterase activity among Kenyan agricultural workers |journal=Occupational and Environmental Medicine |volume=57 |issue=3 |pages=195–200 |doi=10.1136/oem.57.3.195 |issn=1351-0711 |pmc=1739922 |pmid=10810102}}</ref><ref name=":23">{{Cite journal |last1=Magauzi |first1=Regis |last2=Mabaera |first2=Bigboy |last3=Rusakaniko |first3=Simbarashe |last4=Chimusoro |first4=Anderson |last5=Ndlovu |first5=Nqobile |last6=Tshimanga |first6=Mufuta |last7=Shambira |first7=Gerald |last8=Chadambuka |first8=Addmore |last9=Gombe |first9=Notion |date=2011-07-11 |title=Health effects of agrochemicals among farm workers in commercial farms of Kwekwe district, Zimbabwe |journal=The Pan African Medical Journal |volume=9 |issue=1 |page=26 |doi=10.4314/pamj.v9i1.71201 |issn=1937-8688 |pmc=3215548 |pmid=22145061}}</ref> Other studies in Ethiopia have observed reduced respiratory function among farm workers who spray crops with pesticides.<ref>{{Cite journal |last1=Mekonnen |first1=Yalemtsehay |last2=Agonafir |first2=Tadesse |date=2004 |title=Lung function and respiratory symptoms of pesticide sprayers in state farms of Ethiopia |journal=Ethiopian Medical Journal |volume=42 |issue=4 |pages=261–266 |issn=0014-1755 |pmid=16122117}}</ref> Numerous exposure pathways for farm workers increase the risk of pesticide poisoning, including dermal absorption walking through fields and applying products, as well as inhalation exposure.

==== Measuring exposure to pesticides ====
There are multiple approaches to measuring a person's exposure to pesticides, each of which provides an estimate of an individual's internal dose. Two broad approaches include measuring biomarkers and markers of biological effect.<ref name=":03">{{Cite journal |vauthors=He F |date=1999-09-05 |title=Biological monitoring of exposure to pesticides: current issues |journal=Toxicology Letters |volume=108 |issue=2–3 |pages=277–283 |doi=10.1016/S0378-4274(99)00099-5 |pmid=10511272 |bibcode=1999ToxL..108..277H }}</ref> The former involves taking direct measurement of the parent compound or its metabolites in various types of media: urine, blood, serum. Biomarkers may include a direct measurement of the compound in the body before it's been biotransformed during metabolism. Other suitable biomarkers may include the metabolites of the parent compound after they've been biotransformed during metabolism.<ref name=":03" /> Toxicokinetic data can provide more detailed information on how quickly the compound is metabolized and eliminated from the body, and provide insights into the timing of exposure.

Markers of biological effect provide an estimation of exposure based on cellular activities related to the mechanism of action. For example, many studies investigating exposure to pesticides often involve the quantification of the acetylcholinesterase enzyme at the neural synapse to determine the magnitude of the inhibitory effect of organophosphate and carbamate pesticides.<ref name=":13"/><ref name=":33"/><ref name=":23"/><ref name=":03"/>

Another method of quantifying exposure involves measuring, at the molecular level, the amount of pesticide interacting with the site of action. These methods are more commonly used for occupational exposures where the mechanism of action is better understood, as described by WHO guidelines published in "Biological Monitoring of Chemical Exposure in the Workplace".<ref>{{Cite book |author=((World Health Organization. Office of Occupational Health.)) |title=Biological monitoring of chemical exposure in the workplace: guidelines |date=1996 |publisher=World Health Organization |isbn=978-951-802-158-5 |language=en |url=https://apps.who.int/iris/handle/10665/41856 |hdl=10665/41856}}</ref> Better understanding of how pesticides elicit their toxic effects is needed before this method of exposure assessment can be applied to occupational exposure of agricultural workers.

Alternative methods to assess exposure include questionnaires to discern from participants whether they are experiencing symptoms associated with pesticide poisoning. Self-reported symptoms may include headaches, dizziness, nausea, joint pain, or respiratory symptoms.<ref name=":33"/>

===== Challenges in assessing pesticide exposure =====
Multiple challenges exist in assessing exposure to pesticides in the general population, and many others that are specific to occupational exposures of agricultural workers. Beyond farm workers, estimating exposure to family members and children presents additional challenges, and may occur through "take-home" exposure from pesticide residues collected on clothing or equipment belonging to parent farm workers and inadvertently brought into the home. Children may also be exposed to pesticides prenatally from mothers who are exposed to pesticides during pregnancy.<ref name=":32"/> Characterizing children's exposure resulting from drift of airborne and spray application of pesticides is similarly challenging, yet well documented in developing countries.<ref>{{Cite journal |last1=Wesseling |first1=Catharina |last2=De Joode |first2=Berna Van Wendel |last3=Ruepert |first3=Clemens |last4=León |first4=Catalina |last5=Monge |first5=Patricia |last6=Hermosillo |first6=Hernán |last7=Partanen |first7=Limo J. |date=October 2001|title=Paraquat in Developing Countries |journal=International Journal of Occupational and Environmental Health |volume=7 |issue=4 |pages=275–286 |url=http://www.maneyonline.com/doi/abs/10.1179/oeh.2001.7.4.275 |doi=10.1179/oeh.2001.7.4.275 |pmid=11783857 |issn=1077-3525 |language=en|url-access=subscription }}</ref> Because of critical development periods of the fetus and newborn children, these non-working populations are more vulnerable to the effects of pesticides, and may be at increased risk of developing neurocognitive effects and impaired development.<ref name=":32"/><ref name=":022"/>

While measuring biomarkers or markers of biological effects may provide more accurate estimates of exposure, collecting these data in the field is often impractical and many methods are not sensitive enough to detect low-level concentrations. Rapid cholinesterase test kits exist to collect blood samples in the field. Conducting large scale assessments of agricultural workers in remote regions of developing countries makes the implementation of these kits a challenge.<ref name=":03"/> The cholinesterase assay is a useful clinical tool to assess individual exposure and acute toxicity. Considerable variability in baseline enzyme activity among individuals makes it difficult to compare field measurements of cholinesterase activity to a [[reference dose]] to determine health risk associated with exposure.<ref name=":03"/> Another challenge in deriving a reference dose is identifying health endpoints that are relevant to exposure. More epidemiological research is needed to identify critical health endpoints, particularly among populations who are occupationally exposed.

==== Prevention ====
Minimizing harmful exposure to pesticides can be achieved by proper use of personal protective equipment, adequate reentry times into recently sprayed areas, and effective product labeling for hazardous substances as per [[Federal Insecticide, Fungicide, and Rodenticide Act|FIFRA]] regulations. Training high-risk populations, including agricultural workers, on the proper use and storage of pesticides, can reduce the incidence of acute pesticide poisoning and potential chronic health effects associated with exposure. Continued research into the human toxic health effects of pesticides serves as a basis for relevant policies and enforceable [[Pesticide regulation in the United States|standards]] that are health protective to all populations.

===Environmental effects===
{{Main|Environmental effects of pesticides}}

Pesticide use raises a number of environmental concerns. Over 98% of sprayed insecticides and 95% of herbicides reach a destination other than their target species, including non-target species, air, water and soil.<ref name="sustaining"/> [[Pesticide drift]] occurs when pesticides suspended in the air as particles are carried by wind to other areas, potentially contaminating them. Pesticides are one of the causes of [[water pollution]], and some pesticides were [[persistent organic pollutants]] (now banned), which contribute to [[soil contamination|soil]] and flower (pollen, nectar) contamination.<ref name=":6">{{Cite journal|title=A survey of honey bee-collected pollen reveals widespread contamination by agricultural pesticides |journal=Science of the Total Environment |volume=615 |pages=208–218 |doi=10.1016/j.scitotenv.2017.09.226 |pmid=28968582 |year=2018 |last1=Tosi |first1=Simone |last2=Costa |first2=Cecilia |last3=Vesco |first3=Umberto |last4=Quaglia |first4=Giancarlo |last5=Guido |first5=Giovanni |s2cid=19956612}}</ref> Furthermore, pesticide use can adversely impact neighboring agricultural activity, as pests themselves drift to and harm nearby crops that have no pesticide used on them.<ref>{{Cite web |date=February 21, 2020 |title=Soyalism {{!}} DW Documentary |url=https://www.youtube.com/watch?v=ksrc7eI3IMY&t=1459 |website=YouTube |location=Brazil |type=AV media}}</ref>

In addition, pesticide use reduces invertebrate [[biodiversity]] in streams,<ref>{{Cite journal |last1=Liess |first1=Matthias |last2=Liebmann |first2=Liana |last3=Vormeier |first3=Philipp |last4=Weisner |first4=Oliver |last5=Altenburger |first5=Rolf |last6=Borchardt |first6=Dietrich |last7=Brack |first7=Werner |last8=Chatzinotas |first8=Antonis |last9=Escher |first9=Beate |last10=Foit |first10=Kaarina |last11=Gunold |first11=Roman |last12=Henz |first12=Sebastian |last13=Hitzfeld |first13=Kristina L. |last14=Schmitt-Jansen |first14=Mechthild |last15=Kamjunke |first15=Norbert |date=2021-08-01 |title=Pesticides are the dominant stressors for vulnerable insects in lowland streams |url=https://linkinghub.elsevier.com/retrieve/pii/S0043135421004607 |journal=Water Research |volume=201 |article-number=117262 |doi=10.1016/j.watres.2021.117262 |pmid=34118650 |bibcode=2021WatRe.20117262L |issn=0043-1354|url-access=subscription }}</ref> contributes to [[pollinator decline]],<ref>{{cite journal |last1=Dicks |first1=Lynn V. |last2=Breeze |first2=Tom D. |last3=Ngo |first3=Hien T. |last4=Senapathi |first4=Deepa |last5=An |first5=Jiandong |last6=Aizen |first6=Marcelo A. |last7=Basu |first7=Parthiba |last8=Buchori |first8=Damayanti |last9=Galetto |first9=Leonardo |last10=Garibaldi |first10=Lucas A. |last11=Gemmill-Herren |first11=Barbara |last12=Howlett |first12=Brad G. |last13=Imperatriz-Fonseca |first13=Vera L. |last14=Johnson |first14=Steven D. |last15=Kovács-Hostyánszki |first15=Anikó |last16=Kwon |first16=Yong Jung |last17=Lattorff |first17=H. Michael G. |last18=Lungharwo |first18=Thingreipi |last19=Seymour |first19=Colleen L. |last20=Vanbergen |first20=Adam J. |last21=Potts |first21=Simon G. |title=A global-scale expert assessment of drivers and risks associated with pollinator decline |journal=Nature Ecology & Evolution |date=16 August 2021 |volume=5 |issue=10 |pages=1453–1461 |doi=10.1038/s41559-021-01534-9 |pmid=34400826 |bibcode=2021NatEE...5.1453D |s2cid=237148742 |url=http://rid.unrn.edu.ar/handle/20.500.12049/7526}}</ref><ref>{{cite journal |last1=Goulson |first1=Dave |last2=Nicholls |first2=Elizabeth |last3=Botías |first3=Cristina |last4=Rotheray |first4=Ellen L. |title=Bee declines driven by combined stress from parasites, pesticides, and lack of flowers |journal=Science |date=27 March 2015 |volume=347 |issue=6229 |article-number=1255957 |doi=10.1126/science.1255957 |pmid=25721506 |s2cid=206558985 |doi-access=free}}</ref><ref>{{cite news |last=Wells |first=Matt |title=Vanishing bees threaten U.S. crops |date=March 11, 2007 |url=https://news.bbc.co.uk/2/hi/americas/6438373.stm |access-date=2007-09-19 |website=[[BBC News]] |location=London}}</ref> destroys habitat (especially for birds),<ref name="palmerw">{{cite web |vauthors=Palmer WE, Bromley PT, Brandenburg RL |url=http://ipm.ncsu.edu/wildlife/peanuts_wildlife.html |archive-url=https://web.archive.org/web/20080217024025/http://ipm.ncsu.edu/wildlife/peanuts_wildlife.html |archive-date=17 February 2008 |title=Wildlife & Pesticides – Peanuts |publisher=North Carolina Cooperative Extension Service |access-date=11 October 2007}}</ref> and threatens [[endangered species]].<ref name="sustaining"/> Pests can develop a resistance to the pesticide ([[pesticide resistance]]), necessitating a new pesticide. Alternatively a greater dose of the pesticide can be used to counteract the resistance, although this will cause a worsening of the ambient pollution problem.

The [[Stockholm Convention on Persistent Organic Pollutants]] banned all [[Persistent organic pollutant|persistent]] pesticides,<ref>{{Cite web |date=2024 |title=Stockholm Convention on Persistent Organic Pollutants (POPs) |url=https://www.pops.int/ |access-date=6 October 2024 |website=Stockholm Convention on Persistent Organic Pollutants}}</ref><ref>{{cite web |date=April 2005 |title=Ridding The World of Pops: A Guide to the Stockholm Convention on Persistent Organic Pollutants |url=http://www.pops.int/documents/guidance/beg_guide.pdf |archive-url=https://web.archive.org/web/20170315065236/http://www.pops.int/documents/guidance/beg_guide.pdf |archive-date=15 March 2017 |access-date=5 February 2017 |publisher=United Nations Environment Programme}}</ref> in particular [[DDT]] and other organochlorine pesticides, which were stable and [[Lipophilicity|lipophilic]], and thus able to [[Bioaccumulation|bioaccumulate]]<ref name="Castro">{{cite book |last1=Castro |first1=Peter |title=Marine Biology |last2=Huber |first2=Michael E. |date=2010 |publisher=McGraw-Hill Companies Inc. |isbn=978-0-07-352416-0 |edition=8th |location=New York |oclc=488863548 }}</ref> in the body and the [[Biomagnification|food chain]]. and which [[Global distillation|spread throughout the planet]].<ref name="pubs.caes.uga.edu">Pesticide Usage in the United States: History, Benefits, Risks, and Trends; Bulletin 1121, November 2000, K.S. Delaplane, Cooperative Extension Service, The University of Georgia College of Agricultural and Environmental Sciences {{cite web |title=Archived copy |url=http://pubs.caes.uga.edu/caespubs/pubs/PDF/B1121.pdf |archive-url=https://web.archive.org/web/20100613142901/http://pubs.caes.uga.edu/caespubs/pubs/PDF/B1121.pdf |archive-date=2010-06-13 |access-date=2012-11-10}}</ref><ref>{{Cite thesis |type=MSc Thesis |last=Quinn |first=Amie L. |year=2007 |url=http://opus.uleth.ca/handle/10133/676 |title=The impacts of agricultural chemicals and temperature on the physiological stress response in fish |publisher=University of Lethbridge |location=Lethbridge}}</ref>  Persistent pesticides are no longer used for agriculture, and will not be approved by the authorities.<ref name=":7" /><ref name=":8" /> Because the half life in soil is long (for DDT 2–15 years<ref name="National Biomonitoring Program">{{Cite web |date=April 7, 2017 |title=National Biomonitoring Program |url=https://www.cdc.gov/biomonitoring/DDT_BiomonitoringSummary.html |access-date=January 6, 2024 |website=Center for disease control and prevention}}</ref>) residues can still be detected in humans at levels 5 to 10 times lower than found in the 1970s.<ref name="cdc.gov">{{Cite web |date=August 16, 2021 |title=Dichlorodiphenyltrichloroethane (DDT) Factsheet |url=https://www.cdc.gov/biomonitoring/DDT_FactSheet.html |access-date=January 6, 2024 |website=Center for disease control and prevention}}</ref>

Pesticides now have to be [[Pesticide degradation|degradable]] in the environment. Such degradation of pesticides is due to both innate chemical properties of the compounds and environmental processes or conditions.<ref>{{cite journal |vauthors=Sims GK, Cupples AM |year=1999 |title=Factors controlling degradation of pesticides in soil |journal=Pesticide Science |volume=55 |issue=5 |pages=598–601 |issn=1096-9063 |doi= 10.1002/(SICI)1096-9063(199905)55:5<598::AID-PS962>3.0.CO;2-N}}</ref> For example, the presence of [[halogens]] within a chemical structure often slows down degradation in an aerobic environment.<ref>{{cite journal |vauthors=Sims GK, Sommers LE |year=1986 |title=Biodegradation of pyridine derivatives in soil suspensions |journal=Environmental Toxicology and Chemistry |volume=5 |issue=6| pages=503–509 |doi=10.1897/1552-8618(1986)5[503:bopdis]2.0.co;2}}</ref> [[Adsorption]] to soil may retard pesticide movement, but also may reduce [[bioavailability]] to microbial degraders.<ref>{{cite journal |vauthors=Wolt JD, Smith JK, Sims JK, Duebelbeis DO |year=1996 |title=Products and kinetics of cloramsulam-methyl aerobic soil metabolism |journal=J. Agric. Food Chem. |volume=44 |issue=1 |pages=324–332 |doi=10.1021/jf9503570|bibcode=1996JAFC...44..324W }}</ref>

Pesticide contamination in the environment can be monitored through [[bioindicator]]s such as [[bee]] [[pollinator]]s.<ref name=":6" />

===Economics===
{| class="wikitable floatright" style = "text-align:center"
|-
! Harm
! Annual US cost 
|-		
| Public health || $1.1&nbsp;billion
|-
| Pesticide resistance in pest || $1.5&nbsp;billion
|-	
| Crop losses caused by pesticides || $1.4&nbsp;billion
|-	
| Bird losses due to pesticides || $2.2&nbsp;billion
|-	
| Groundwater contamination || $2.0&nbsp;billion
|-	
| Other costs || $1.4&nbsp;billion
|-	
| '''Total costs''' || '''$9.6&nbsp;billion'''
|}

In one study, the human health and environmental costs due to pesticides in the United States was estimated to be $9.6 billion: offset by about $40&nbsp;billion in increased agricultural production.<ref name="Pimental">{{cite journal |vauthors=Pimentel D |year=2005 |title=Environmental and Economic Costs of the Application of Pesticides Primarily in the United States |journal=Environment, Development and Sustainability |volume=7 |issue=2| pages=229–252 |url=http://www.beyondpesticides.org/documents/pimentel.pesticides.2005update.pdf |doi=10.1007/s10668-005-7314-2|bibcode=2005EDSus...7..229P | s2cid=35964365}}</ref>

Additional costs include the registration process and the cost of purchasing pesticides: which are typically borne by agrichemical companies and farmers respectively. The registration process can take several years to complete (there are 70 types of field tests) and can cost $50–70&nbsp;million for a single pesticide.<ref name="Pimental" /> At the beginning of the 21st century, the United States spent approximately $10&nbsp;billion on pesticides annually.<ref name="Pimental" />

==Resistance==
{{main|Pesticide resistance}}

The use of pesticides inherently entails the risk of resistance developing. Various techniques and procedures of [[pesticide application]] can slow the development of resistance, as can some natural features of the target population and surrounding environment.<ref name="Dunlop-et-al-2018" />

==Alternatives==
Alternatives to pesticides are available and include methods of cultivation, use of [[biological pest control]]s (such as pheromones and microbial pesticides), [[genetic engineering]] (mostly [[Genetically modified crops|of crops]]), and methods of interfering with insect breeding.<ref name="sustaining"/> Application of composted yard waste has also been used as a way of controlling pests.<ref name="nematodes">{{cite journal |vauthors=McSorley R, Gallaher RN |title=Effect of yard waste compost on nematode densities and maize yield |journal=Journal of Nematology |volume=28 |issue=4S |pages=655–60 |date=December 1996 |pmid=19277191 |pmc=2619736}}</ref>

These methods are becoming increasingly popular and often are safer than traditional chemical pesticides. In addition, EPA is registering reduced-risk pesticides in increasing numbers.{{citation needed|date=December 2022}}

===Cultivation practices===
Cultivation practices include [[polyculture]] (growing multiple types of plants), [[crop rotation]], planting crops in areas where the pests that damage them do not live, timing planting according to when pests will be least problematic, and use of [[trap crop]]s that attract pests away from the real crop.<ref name="sustaining"/> Trap crops have successfully controlled pests in some commercial agricultural systems while reducing pesticide usage.<ref>{{cite journal |vauthors=Shelton AM, Badenes-Perez FR |date=Dec 6, 2005 |title=Concepts and applications of trap cropping in pest management |journal=Annual Review of Entomology |volume=51 |issue=1 |pages=285–308 |doi=10.1146/annurev.ento.51.110104.150959 |pmid=16332213}}</ref> In other systems, trap crops can fail to reduce pest densities at a commercial scale, even when the trap crop works in controlled experiments.<ref>{{Cite journal |last1=Holden |first1=Matthew H. |last2=Ellner |first2=Stephen P. |last3=Lee |first3=Doo-Hyung |last4=Nyrop |first4=Jan P. |last5=Sanderson |first5=John P. |date=2012-06-01 |title=Designing an effective trap cropping strategy: the effects of attraction, retention and plant spatial distribution |journal=Journal of Applied Ecology |volume=49 |issue=3 |pages=715–722 |doi=10.1111/j.1365-2664.2012.02137.x |bibcode=2012JApEc..49..715H |doi-access=free}}</ref>

===Use of other organisms===
Release of other organisms that fight the pest is another example of an alternative to pesticide use. These organisms can include natural [[predator]]s or [[parasite]]s of the pests.<ref name="sustaining"/> [[Biological pesticides]] based on [[entomopathogenic fungi]], [[bacteria]] and [[virus]]es causing disease in the pest species can also be used.<ref name="sustaining"/>

===Biological control engineering===
Interfering with insects' reproduction can be accomplished by [[Sterile insect technique|sterilizing males]] of the target species and releasing them, so that they [[mating|mate]] with females but do not produce offspring.<ref name="sustaining"/> This technique was first used on the [[Cochliomyia hominivorax|screwworm fly]] in 1958 and has since been used with the [[medfly]], the [[tsetse fly]],<ref>{{Cite web |title=The Biological Control of Pests |date=Jul 25, 2007 |url=http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/B/Biocontrols.html |archive-url=https://web.archive.org/web/20070921015356/http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/B/Biocontrols.html |archive-date=September 21, 2007 |access-date=Sep 17, 2007}}</ref> and the [[gypsy moth]].<ref>{{Cite book |title=Skylab, Classroom in Space |publisher=[[Marshall Space Flight Center|MSFC]] |year=1977 |editor-last=Summerlin |editor-first=Lee B. |location=Washington |chapter=Chapter 17: Life Sciences |access-date=Sep 17, 2007 |chapter-url=https://history.nasa.gov/SP-401/ch17.htm}}</ref> This is a costly and slow approach that only works on some types of insects.<ref name="sustaining"/>

===Other alternatives===
Other alternatives include "laserweeding" – the use of novel [[agricultural robot]]s for [[weed control]] [[agricultural technology|using lasers]].<ref name="interestingengineeringPapadopoulos">{{cite news |last1=Papadopoulos |first1=Loukia |title=This new farming robot uses lasers to kill 200,000 weeds per hour |url=https://interestingengineering.com/innovation/farming-robot-lasers-200000-weeds-per-hour |access-date=17 November 2022 |work=interestingengineering.com |date=21 October 2022}}</ref>

===Push pull strategy===
[[Push–pull agricultural pest management|Push-pull technique]]: intercropping with a "push" crop that repels the pest, and planting a "pull" crop on the boundary that attracts and traps it.<ref name=PushPull>{{cite journal |vauthors=Cook SM, Khan ZR, Pickett JA |title=The use of push-pull strategies in integrated pest management |journal=Annual Review of Entomology |volume=52 |issue=1 |pages=375–400 |year=2007 |doi=10.1146/annurev.ento.52.110405.091407 |pmid=16968206}}</ref>

=== Effectiveness ===
Some evidence shows that alternatives to pesticides can be equally effective as the use of chemicals. A study of [[Maize]] fields in northern Florida found that the application of composted yard waste with high [[carbon to nitrogen ratio]] to agricultural fields was highly effective at reducing the population of plant-parasitic [[nematode]]s and increasing crop yield, with yield increases ranging from 10% to 212%; the observed effects were long-term, often not appearing until the third season of the study.<ref name="nematodes" /> Additional [[silicon#Biological role|silicon]] nutrition protects some [[horticultural crop]]s against [[fungal plant pathogen|fungal diseases]] almost completely, while insufficient silicon sometimes leads to severe infection even when fungicides are used.<ref name="Epstein-1999">{{cite journal |last=Epstein |first=Emanuel |title=Silicon |journal=[[Annual Review of Plant Physiology and Plant Molecular Biology]] |publisher=[[Annual Reviews (publisher)|Annual Reviews]] |volume=50 |issue=1 |year=1999 |issn=1040-2519 |doi=10.1146/annurev.arplant.50.1.641 |pages=641–664 |pmid=15012222}}</ref>

Pesticide resistance is increasing and that may make alternatives more attractive.

==Types==
===Biopesticides===
{{Main|Biopesticide}}

[[Biopesticides]] are certain types of pesticides derived from such natural materials as animals, plants, bacteria, and certain minerals. For example, canola oil and baking soda have pesticidal applications and are considered biopesticides. Biopesticides fall into three major classes:

* [[Microbial]] pesticides which consist of bacteria, [[entomopathogenic fungi]] or viruses (and sometimes includes the metabolites that bacteria or fungi produce). Entomopathogenic [[nematode]]s are also often classed as microbial pesticides, even though they are multi-cellular.<ref name="Coombs">{{cite web |last=Coombs |first=Amy |title=Fighting Microbes with Microbes |url=http://www.the-scientist.com/?articles.view/articleNo/33703/title/Fighting-Microbes-with-Microbes/ |date=Jan 1, 2013 |work=The Scientist |access-date=18 April 2013}}</ref><ref>{{Cite book |title=Microbial Insecticides: Principles and Applications |date=2011 |publisher=Nova Science Publishers |isbn=978-1-61942-770-9 |editor-last=Borgio |editor-first=J. Francis |location=New York |page=492 |oclc=780442651 |editor-last2=Sahayaraj |editor-first2=K. |editor-last3=Susurluk |editor-first3=Ismail Alper }}</ref>
* Biochemical pesticides or herbal pesticides<ref>{{Cite journal |vauthors=Pal GK, Kumar B |date=2013 |title=Antifungal activity of some common weed extracts against wilt causing fungi, ''Fusarium oxysporum'' |journal=Current Discovery |volume=2 |issue=1 |pages=62–67 |issn=2320-4400 |url=https://www.academia.edu/5848539 |via=Academia}}</ref> are naturally occurring substances that control (or monitor in the case of [[pheromones]]) pests and microbial diseases.
* Plant-incorporated protectants (PIPs) have genetic material from other species incorporated into their genetic material (''i.e.'' [[GM crop]]s). Their use is controversial, especially in many European countries.<ref>{{Cite web |url=http://npic.orst.edu/reg/pip.html |title=Plant Incorporated Protectants (PIPs) / Genetically Modified Plants |date=February 9, 2017 |website=npic.orst.edu |publisher=[[National Pesticide Information Center|US NPIC]] |access-date=Dec 9, 2018}}</ref>

===By pest type===
Pesticides that are related to the type of pests are:<ref name="US-EPA">{{cite web |title=Types of Pesticides |url=https://www.epa.gov/ingredients-used-pesticide-products |archive-url=https://web.archive.org/web/20130328231904/http://www.epa.gov/pesticides/about/types.htm |archive-date=March 28, 2013 |access-date=February 20, 2013 |url-status=live |publisher=US [[United States Environmental Protection Agency|EPA]]}}</ref>
{| class="wikitable"
|-
! Type !! Action
|-
| [[Algaecide|Algicides]] || Control algae in lakes, canals, swimming pools, water tanks, and other sites
|-
|[[Avicide]]s
|kill birds
|-
| [[Biofouling|Antifouling]] agents || Kill or repel organisms that attach to underwater surfaces, such as boat bottoms
|-
| [[Antimicrobials]] || Kill microorganisms (such as bacteria and viruses)
|-
| [[Pheromone trap|Attractants]] || Attract pests (for example, to lure an insect or rodent to a trap).
|-
|[[Bactericide]]s
|Kill bacteria
|-
| [[Biopesticides]] || Certain types of pesticides derived from such natural materials as animals, plants, bacteria, and certain minerals
|-
| [[Biocides]] || Kill microorganisms
|-
|[[Defoliant]]s
|Cause  leaves or foliage to drop from a plant, usually to facilitate harvest. 
|-
|[[Desiccant]]s 
|Promote  drying of living tissues, such as unwanted plant tops. 
|-
| [[Disinfectants]] and sanitizers || Kill or inactivate disease-producing microorganisms on inanimate objects
|-
| [[Fungicides]] || Kill fungi (including blights, mildews, molds, and rusts)
|-
| [[Fumigation|Fumigants]] || Produce gas or vapor intended to destroy pests in buildings or soil
|-
|[[Gene drive]]s
|A  genetic mechanism embedded into the genetic material of the target species, which can kill or suppress the reproductive of its descendants.<ref name="Dhole-et-al-2020">{{cite journal |last1=Dhole |first1=Sumit |last2=Lloyd |first2=Alun L. |last3=Gould |first3=Fred |date=2020-11-02 |title=Gene Drive Dynamics in Natural Populations: The Importance of Density Dependence, Space, and Sex |journal=[[Annual Review of Ecology, Evolution, and Systematics]] |publisher=[[Annual Reviews (publisher)|Annual Reviews]] |volume=51 |issue=1 |pages=505–531 |arxiv=2005.01838 |doi=10.1146/annurev-ecolsys-031120-101013 |issn=1543-592X |pmc=8340601 |pmid=34366722 |s2cid=218502293}}</ref>
|-
| [[Herbicides]] || Kill weeds and other plants that grow where they are not wanted
|-
|[[Insect growth regulator]]s
|Disrupt  the molting, maturing from pupal stage to adult, or other life processes of  insects. 
|-
| [[Insecticides]] || Kill insects and other arthropods
|-
|[[Lampricide]]s
|Kills Lampreys
|-
| [[Miticides]] or acaricides || Kill mites that feed on plants and animals
|-
| [[Biopesticide|Microbial pesticides]] || Microorganisms that kill, inhibit, or out compete pests, including insects or other microorganisms
|-
| [[Molluscicide]]s || Kill snails and slugs
|-
| [[Nematicide]]s || Kill nematodes (microscopic, worm-like organisms that feed on plant roots)
|-
| [[Ovicides]]|| Kill eggs of insects and mites
|-
| [[Pheromones]] || Biochemicals used to disrupt the mating behavior of insects
|-
|[[Piscicide]]
|Kills fish
|-
|[[Plant growth regulator]]s
|Alter  the expected growth, flowering or reproduction rate of plants (does not  include fertilizers).
|-
|[[Biopesticide|Plant Incorporated protectants]] 
|Substances that plants produce from genetic material that has been added to the plant. 
|-
| [[Insect repellent|Repellent]]s || Repel pests, including insects (such as mosquitoes) and birds
|-
| [[Rodenticides]] || Control mice and other rodents
|-
| [[Slimicide]]s || Kill slime-producing microorganisms such as [[algae]], [[bacteria]], [[fungi]], and [[slime mold]]s
|-
|Soil sterilant
|Temporarily or permanently prevents the growth of all plants and animals<ref name=":10">{{CRS|article=Report for Congress: Agriculture: A Glossary of Terms, Programs, and Laws, 2005 Edition|url=http://ncseonline.org/nle/crsreports/05jun/97-905.pdf|author=Jasper Womach}}</ref>
|-
|[[Virucide]]s
|Kills viruses.
|-
|[[Wood preservation|Wood preservatives]]
|Used to make wood resistant to insects, fungi, and other pests.
|}

==Regulation==
===International===
In many countries, pesticides must be approved for sale and use by a government agency.<ref name=":3">{{Cite book |title=Radcliffe's IPM World Textbook |last=Willson |first=Harold R. |publisher=University of Minnesota |year=1996 |editor-last=Radcliffe |editor-first=E. B. |location=St. Paul |chapter=Pesticide Regulations |editor-last2=Hutchison |editor-first2=W. D. |editor-last3=Cancelado |editor-first3=R. E. |chapter-url=https://ipmworld.umn.edu/wilson-regulations |archive-url=https://web.archive.org/web/20170713110412/https://ipmworld.umn.edu/wilson-regulations |archive-date=July 13, 2017 |url-status=live}}</ref><ref>{{Cite web |url=http://pest-aside.com.my/Act_149-Pesticides_Act_1974_Malaysia_Kota_Kinabalu.pdf |archive-url=https://web.archive.org/web/20180704063557/http://pest-aside.com.my/Act_149-Pesticides_Act_1974_Malaysia_Kota_Kinabalu.pdf |archive-date=2018-07-04 |url-status=live |title=Laws of Malaysia. Act 149: Pesticides Act 1974 |date=Jun 1, 2015 |website=pest-aside.com.my |access-date=Dec 10, 2018}}</ref>

Worldwide, 85% of countries have pesticide legislation for the proper storage of pesticides and 51% include provisions to ensure proper disposal of all obsolete pesticides.<ref name="NationsOrganization2019">{{cite book |author1=Food and Agriculture Organization of the United Nations |author2=World Health Organization |title=Global situation of pesticide management in agriculture and public health: Report of a 2018 WHO–FAO survey |url=https://books.google.com/books?id=tGe_DwAAQBAJ&pg=PA25 |date=14 November 2019 |publisher=Food & Agriculture Org. |isbn=978-92-5-131969-7 |pages=25–}}</ref>

Though pesticide regulations differ from country to country, pesticides, and products on which they were used are traded across international borders. To deal with inconsistencies in regulations among countries, delegates to a conference of the United Nations [[Food and Agriculture Organization]] adopted an International Code of Conduct on the Distribution and Use of Pesticides in 1985 to create voluntary standards of pesticide regulation for many countries.<ref name=":3" /> The Code was updated in 1998 and 2002.<ref>{{cite web |url=http://www.fao.org/ag/AGP/AGPP/Pesticid/Code/PM_Code.htm|title=Programmes: International Code of Conduct on the Distribution and Use of Pesticides|publisher=[[Food and Agriculture Organization|UN FAO]]|archive-url=https://web.archive.org/web/20081202034101/http://www.fao.org/ag/agp/agpp/pesticid/Code/PM_Code.htm|archive-date=December 2, 2008|access-date=October 25, 2007}}</ref> The FAO claims that the code has raised awareness about pesticide hazards and decreased the number of countries without restrictions on pesticide use.<ref name="code">{{cite web |publisher=Food and Agriculture Organization of the United Nations |date=2002 |url=http://www.fao.org/WAICENT/FAOINFO/AGRICULT/AGP/AGPP/Pesticid/Code/Download/code.pdf |archive-url= https://web.archive.org/web/20130404190746/http://www.fao.org/WAICENT/FAOINFO/AGRICULT/AGP/AGPP/Pesticid/Code/Download/code.pdf |archive-date=4 April 2013 |title=International Code of Conduct on the Distribution and Use of Pesticides}}</ref>

Three other efforts to improve regulation of international pesticide trade are the [[United Nations London Guidelines for the Exchange of Information on Chemicals in International Trade]] and the [[Codex Alimentarius|United Nations Codex Alimentarius Commission]]. The former seeks to implement procedures for ensuring that prior informed consent exists between countries buying and selling pesticides, while the latter seeks to create uniform standards for maximum levels of pesticide residues among participating countries.<ref>{{Cite journal |vauthors=Reynolds JD |date=1997 |title=International Pesticide Trade: Is There any Hope for the Effective Regulation of Controlled Substances? |journal=Journal of Land Use & Environmental Law |volume=13 |issue=1 |pages=69–105 |url=http://www.law.fsu.edu/journals/landuse/vol131/reyn.html |jstor=42842699 |archive-date=May 27, 2012 |archive-url=https://web.archive.org/web/20120527062748/http://www.law.fsu.edu/journals/landuse/vol131/reyn.html |jstor-access=free}}</ref>

===United States===
{{Main|Pesticide regulation in the United States}}

[[File:Monsanto's Lasso herbicide (cropped).jpg|thumb|upright|Preparation for an [[pesticide application|application]] of hazardous herbicide in the US]]

In the [[United States]], the [[United States Environmental Protection Agency|Environmental Protection Agency]] (EPA) is responsible for regulating pesticides under the [[Federal Insecticide, Fungicide, and Rodenticide Act]] (FIFRA) and the [[Food Quality Protection Act]] (FQPA).<ref name="epa.gov">{{cite web |title=Pesticides and Public Health |url=http://www.epa.gov/pesticides/health/public.htm#regulation |date=2015-08-20 |website=Pesticides: Health and Safety |publisher=[[United States Environmental Protection Agency|US EPA]] |archive-url=https://web.archive.org/web/20140114104958/http://www.epa.gov/pesticides/health/public.htm |archive-date=January 14, 2014 |access-date=Dec 10, 2018}}</ref>

Studies must be conducted to establish the conditions in which the material is safe to use and the effectiveness against the intended pest(s).<ref>{{cite web |title=Data Requirements for Pesticide Registration|date=2015-08-20|website=Pesticides: Regulating Pesticides |access-date=Dec 10, 2018 |url= http://www.epa.gov/pesticides/regulating/data_requirements.htm |publisher=[[United States Environmental Protection Agency|US EPA]]|archive-url=https://web.archive.org/web/20130401081851/http://www.epa.gov/pesticides/regulating/data_requirements.htm |archive-date=April 1, 2013}}</ref> The EPA regulates pesticides to ensure that these products do not pose adverse effects to humans or the environment, with an emphasis on the health and safety of children.<ref name=":5">{{cite web |first1=Susan |last1=Wayland |first2=Penelope |last2=Fenner-Crisp |date=April 2020 |url=http://www.epaalumni.org/hcp/pesticides.pdf |title=Reducing Pesticide Risks: A Half Century of Progress |publisher=EPA Alumni Association |orig-date=March 2016 |archive-url=https://web.archive.org/web/20161022222635/http://www.epaalumni.org/hcp/pesticides.pdf |archive-date=2016-10-22 }}</ref> Pesticides produced before November 1984 continue to be reassessed in order to meet the current scientific and regulatory standards. All registered pesticides are reviewed every 15 years to ensure they meet the proper standards.<ref name="epa.gov"/> During the registration process, a label is created. The label contains directions for proper use of the material in addition to safety restrictions. Based on acute toxicity, pesticides are assigned to a [[Toxicity Class]]. Pesticides are the most thoroughly tested chemicals after drugs in the United States; those used on food require more than 100 tests to determine a range of potential impacts.<ref name=":5" />

Some pesticides are considered too hazardous for sale to the general public and are designated [[restricted use pesticide]]s. Only certified applicators, who have passed an exam, may purchase or supervise the application of restricted use pesticides.<ref name=":3" /> Records of sales and use are required to be maintained and may be audited by government agencies charged with the enforcement of pesticide regulations.<ref>{{cite web |title=Protocol for Conducting Environmental Compliance Audits under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) |date=2011 |website=epa.gov |publisher=[[United States Environmental Protection Agency|US EPA]] |url=http://www.epa.gov/compliance/resources/policies/incentives/auditing/apcol-fifra.pdf |access-date=Dec 10, 2018 |archive-url=https://web.archive.org/web/20140801031141/http://www.epa.gov/compliance/resources/policies/incentives/auditing/apcol-fifra.pdf|archive-date=August 1, 2014}}</ref><ref>{{Cite book |chapter-url=https://www.epa.gov/sites/default/files/2014-01/documents/fiframanual.pdf |archive-url=https://web.archive.org/web/20150921202142/http://www2.epa.gov/sites/production/files/2014-01/documents/fiframanual.pdf |archive-date=2015-09-21 |url-status=live |title=Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Inspection Manual |publisher=[[United States Environmental Protection Agency|US EPA]] |year=2013 |location=Washington |pages=11–1–11–4 |chapter=Ch. 11. Restricted-Use Pesticides: Dealer and Applicator Records Inspections}}</ref> These records must be made available to employees and state or territorial environmental regulatory agencies.<ref>{{cite web |title=Chemical Hazard Communication |date=1998 |url=https://www.osha.gov/Publications/osha3084.html |publisher=United States Department of Labor; [[Occupational Safety and Health Administration|OSHA]]}}</ref><ref>{{Cite web |url=https://www.epa.gov/epcra |title=Emergency Planning and Community Right-to-Know Act (EPCRA) |date=Jul 24, 2013 |publisher=[[United States Environmental Protection Agency|US EPA]] |access-date=Dec 10, 2018}}</ref>

In addition to the EPA, the [[United States Department of Agriculture]] (USDA) and the United States [[Food and Drug Administration]] (FDA) set standards for the level of pesticide residue that is allowed on or in crops.<ref name="Regulations">{{cite web |url=http://ipm.ncsu.edu/safety/factsheets/laws.pdf |title=Federal Pesticide Laws and Regulations |date=Mar 1996 |publisher=North Carolina Cooperative Extension Service |archive-url=https://web.archive.org/web/20150403092424/http://ipm.ncsu.edu/safety/factsheets/laws.pdf |archive-date=April 3, 2015 |access-date=Dec 10, 2018 |last=Toth |first=Stephen J. Jr.}}</ref> The EPA looks at what the potential human health and environmental effects might be associated with the use of the pesticide.<ref name="EPA">{{cite web |title=Pesticide Registration Program |url=http://www.epa.gov/pesticides/factsheets/registration.htm |date=2010 |website=Pesticides: Topical & Chemical Fact Sheets |publisher=[[United States Environmental Protection Agency|US EPA]] |archive-url=https://web.archive.org/web/20110212233949/http://www.epa.gov/pesticides/factsheets/registration.htm |archive-date=February 12, 2011 |access-date=February 25, 2011}}</ref>

In addition, the U.S. EPA uses the National Research Council's four-step process for human health risk assessment: (1) Hazard Identification, (2) Dose-Response Assessment, (3) Exposure Assessment, and (4) Risk Characterization.<ref>{{cite web |url=http://www.epa.gov/pesticides/factsheets/riskassess.htm|title=Assessing Health Risks from Pesticides|date=Apr 5, 2007 |website=Pesticides: Topical & Chemical Fact Sheets|publisher=[[United States Environmental Protection Agency|US EPA]]|archive-url=https://web.archive.org/web/20140401031231/http://www.epa.gov/pesticides/factsheets/riskassess.htm|archive-date=April 1, 2014 |access-date=Dec 10, 2018}}</ref>

In 2013 Kaua'i County (Hawaiʻi) passed Bill No. 2491 to add an article to Chapter 22 of the county's code relating to pesticides and GMOs. The bill strengthens protections of local communities in Kaua'i where many large pesticide companies test their products.<ref>{{cite web |url=http://media.wix.com/ugd/5f73cf_56e4e700de9ae57e7b709740824bbed4.pdf |title=Bill No. 2491, Draft 2 |publisher=Council of the County of Kaua'i |date=October 17, 2013}}</ref>

The first legislation providing federal authority for regulating pesticides was enacted in 1910.<ref name="Goldman 2007" />

===Canada===
{{main|Pest Management Regulatory Agency}}

===EU===
{{main|Regulation of pesticides in the European Union}}

EU legislation has been approved banning the use of highly toxic pesticides including those that are [[carcinogenic]], [[mutagenic]] or toxic to reproduction, those that are endocrine-disrupting, and those that are [[persistent, bioaccumulative and toxic substances|persistent, bioaccumulative and toxic]] (PBT) or very persistent and very bioaccumulative (vPvB) and measures have been approved to improve the general safety of pesticides across all EU member states.<ref>{{Cite web |date=Jan 13, 2009 |title=MEPs approve pesticides legislation |url=http://www.europarl.europa.eu/news/expert/infopress_page/066-45937-012-01-03-911-20090112IPR45936-12-01-2009-2009-false/default_en.htm |archive-url=https://web.archive.org/web/20090201195914/http://www.europarl.europa.eu/news/expert/infopress_page/066-45937-012-01-03-911-20090112IPR45936-12-01-2009-2009-false/default_en.htm |archive-date=February 1, 2009 |access-date=Dec 10, 2018 |website=europarl.europa.eu |publisher=EU Parliament}}</ref>

In 2023 The Environment Committee of European Parliament approved a decision aiming to reduce pesticide use by 50% (the most hazardous by 65%) by the year 2030 and ensure sustainable use of pesticides (for example use them only as a last resort). The decision also includes measures for providing farmers with alternatives.<ref>{{cite news |last1=Hemingway Jaynes |first1=Cristen |title=EU Votes to Cut Pesticide Use in Half by 2030 |url=https://www.ecowatch.com/eu-pesticide-reduction-2030.html |access-date=6 November 2023 |website=Ecowatch |date=25 October 2023 |editor-last1=McDermott |editor-first1=Chris}}</ref>

==Residue==
{{Main|Pesticide residue}}

Pesticide residue refers to the pesticides that may remain on or in food after they are applied to food crops.<ref>{{Cite book |title=Compendium of Chemical Terminology |date=1987 |publisher=Blackwell |isbn=978-0-9678550-9-7 |editor-last=McNaught |editor-first=Alan D. |edition=2nd |location=Oxford |chapter=Pesticide Residue |doi=10.1351/goldbook.P04520 |oclc=901451465 |editor-last2=Wilkinson |editor-first2=Andrew |title-link=IUPAC books#Gold Book}} XML on-line corrected version created by Nic M, Jirat J, Kosata B; updates compiled by Jenkins A.</ref> The [[maximum residue limit]]s (MRL) of pesticides in food are carefully set by the regulatory authorities to ensure, to their best judgement, no health impacts. Regulations such as pre-harvest intervals also often prevent harvest of crop or livestock products if recently treated in order to allow residue concentrations to decrease over time to safe levels before harvest. Exposure of the general population to these residues most commonly occurs through consumption of treated food sources, or being in close contact to areas treated with pesticides such as farms or lawns.<ref name="EPAres">{{cite web|url=http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd&lv=list.listByAlpha&r=224028&subtop=312 |title=Pesticide Residues in Food |date=Dec 5, 2011 |publisher=[[United States Environmental Protection Agency|US EPA]] |archive-url=https://web.archive.org/web/20131104075151/http://cfpub.epa.gov/eroe/index.cfm?fuseaction=detail.viewInd&lv=list.listByAlpha&r=224028&subtop=312 |archive-date=November 4, 2013 |access-date=Dec 10, 2018}}</ref>

[[Persistent organic pollutant|Persistent]] pesticides are no longer used for agriculture, and will not be approved by the authorities.<ref>{{Cite web |date=January 4, 2024 |title=About Pesticide Registration |url=https://www.epa.gov/pesticide-registration/about-pesticide-registration#registration |access-date=January 6, 2024 |website=EPA (environmental protection agency)}}</ref><ref>{{Cite web |title=Approval of pesticides and herbicides in the EU |url=https://food.ec.europa.eu/plants/pesticides/approval-active-substances_en |access-date=January 6, 2024 |publisher=[[European Commission]]}}</ref> Because the half life in soil is long (for DDT 2–15 years<ref name="National Biomonitoring Program"/>) residues can still be detected in humans at levels 5 to 10 times lower than found in the 1970s.<ref name="cdc.gov"/>

Residues are monitored by the authorities. In 2016, over 99% of samples of US produce had no pesticide residue or had residue levels well below the [[EPA]] tolerance levels for each pesticide.<ref name="PDP">{{Cite web |title=Pesticide Data Program |url=https://www.ams.usda.gov/datasets/pdp |access-date=January 6, 2024 |website=U.S. Department of Agriculture (USDA)}}</ref>

== See also ==
* [[Index of pesticide articles]]
*[[Environmental hazard]]
* [[Pest control]]
* [[Pesticide residue]]
* [[Pesticide standard value]]
* [[WHO Pesticide Evaluation Scheme]]

== References ==
{{Reflist|refs=
<ref name="sustaining">{{cite book |title=Sustaining the Earth |last=Miller |first=G. Tyler |publisher=Thompson Learning, Inc. |year=2004 |isbn=978-0-495-55687-9 |edition=6th |location=Pacific Grove, CA |pages=211–216 |chapter=Ch. 9. Biodiversity |oclc=52134759}}</ref>
}}

===Bibliography===

* Davis, Frederick Rowe. "Pesticides and the perils of synecdoche in the history of science and environmental history." ''History of Science'' 57.4 (2019): 469–492.
* Davis, Frederick Rowe. ''Banned: a history of pesticides and the science of toxicology'' (Yale UP, 2014).
* Matthews, Graham A. ''A history of pesticides'' (CABI, 2018).
*{{cite journal
|journal=Chemosphere
|volume=6
|issue=10
|year=1977
|pages=641–651
|title=Analysis of an aromatic solvent used in a forest spray program
|author=S.Safe
|author2=H.Plugge
|author3=J.F.S.Crocker
|doi=10.1016/0045-6535(77)90075-3
|bibcode=1977Chmsp...6..641S
}}

== Sources ==
{{Free-content attribution
| title = World Food and Agriculture – Statistical Yearbook 2023
| author = FAO
| publisher = FAO
| documentURL = https://www.fao.org/documents/card/en?details=cc8166en
| license statement URL = https://commons.wikimedia.org/whttps://commons.wikimedia.org/wiki/File:World_Food_and_Agriculture_-_Statistical_Yearbook_2023.pdf
| license = CC BY-SA IGO 3.0
}}

== External links ==
{{Prone to spam|date=September 2018}}
<!--     {{No more links}}

       Please be cautious about adding more external links.

Wikipedia is not a collection of links and should not be used for advertising.

     Excessive or inappropriate links will be removed.

 See [[Wikipedia:External links]] and [[Wikipedia:Spam]] for details.

If there are already suitable links, propose additions or replacements on
the article's talk page.

-->
{{commons category|Pesticides}}

* [https://www.who.int/topics/pesticides/en/ Pesticides] at the [[World Health Organization]] (WHO)
* [https://www.unep.org/explore-topics/chemicals-waste/what-we-do/emerging-issues/highly-hazardous-pesticides-hhps Pesticides] at the [[United Nations Environment Programme]] (UNEP)
* [https://food.ec.europa.eu/plants/pesticides_en Pesticides] at the [[European Commission]]
* [https://www.epa.gov/pesticides Pesticides] at the [[United States Environmental Protection Agency]]

{{pesticides|state=expanded}}
{{Horticulture and gardening}}
{{Consumer Food Safety}}
{{Neurotoxins}}
{{Pollution}}
{{Authority control}}
{{Portal bar|Agriculture and agronomy|Science}}

[[Category:Chemical substances]]
[[Category:Pesticides| ]]
[[Category:Toxic effects of pesticides]]
[[Category:Soil contamination]]
[[Category:Biocides]]