Pesticide application can artificially select for resistant pests. In this diagram, the first generation happens to have an insect with a heightened resistance to a pesticide (red). After pesticide application, its descendants represent a larger proportion of the population, because sensitive pests (white) have been selectively killed. After repeated applications, resistant pests may comprise the majority of the population.
Pesticide application can artificially select for resistant pests. In this diagram, the first generation happens to have an insect with a heightened resistance to a pesticide (red). After pesticide application, its descendants represent a larger proportion of the population, because sensitive pests (white) have been selectively killed. After repeated applications, resistant pests may comprise the majority of the population.

Pesticide resistance describes the decreased susceptibility of a pest population to a pesticide that was previously effective at controlling the pest. Pest species evolve pesticide resistance via natural selection: the most resistant specimens survive and pass on their acquired heritable changes traits to their offspring.[1] If a pest has resistance then the pesticide lacks efficacy – efficacy and resistance are inversely related.[2]

Cases of resistance have been reported in all classes of pests (i.e. crop diseases, weeds, rodents, etc.), with 'crises' in insect control occurring early-on after the introduction of pesticide use in the 20th century. The Insecticide Resistance Action Committee (IRAC) definition of insecticide resistance is 'a heritable change in the sensitivity of a pest population that is reflected in the repeated failure of a product to achieve the expected level of control when used according to the label recommendation for that pest species'.[3]

Pesticide resistance is increasing. Farmers in the US lost 7% of their crops to pests in the 1940s; over the 1980s and 1990s, the loss was 13%, even though more pesticides were being used.[1] Over 500 species of pests have evolved a resistance to a pesticide.[4] Other sources estimate the number to be around 1,000 species since 1945.[5]

Although the evolution of pesticide resistance is usually discussed as a result of pesticide use, it is important to keep in mind that pest populations can also adapt to non-chemical methods of control. For example, the northern corn rootworm (Diabrotica barberi) became adapted to a corn-soybean crop rotation by spending the year when the field is planted with soybeans in a diapause.[6]

As of 2014, few new weed killers are near commercialization, and none with a novel, resistance-free mode of action.[7] Similarly, as of January 2019 discovery of new insecticides is more expensive and difficult than ever.[8]


Pesticide resistance probably stems from multiple factors:


Resistance has evolved in multiple species: resistance to insecticides was first documented by A. L. Melander in 1914 when scale insects demonstrated resistance to an inorganic insecticide. Between 1914 and 1946, 11 additional cases were recorded. The development of organic insecticides, such as DDT, gave hope that insecticide resistance was a dead issue. However, by 1947 housefly resistance to DDT had evolved. With the introduction of every new insecticide class – cyclodienes, carbamates, formamidines, organophosphates, pyrethroids, even Bacillus thuringiensis – cases of resistance surfaced within two to 20 years.


Insecticides are widely used across the world to increase agricultural productivity and quality in vegetables and grains (and to a lesser degree the use for vector control for livestock). The resulting resistance has reduced function for those very purposes, and in vector control for humans.[22]

Multiple and cross-resistance


Pests becomes resistant by evolving physiological changes that protect them from the chemical.[11]

One protection mechanism is to increase the number of copies of a gene, allowing the organism to produce more of a protective enzyme that breaks the pesticide into less toxic chemicals.[11] Such enzymes include esterases, glutathione transferases, and mixed microsomal oxidases.[11]

Alternatively, the number and/or sensitivity of biochemical receptors that bind to the pesticide may be reduced.[11]

Behavioral resistance has been described for some chemicals. For example, some Anopheles mosquitoes evolved a preference for resting outside that kept them away from pesticide sprayed on interior walls.[23]

Resistance may involve rapid excretion of toxins, secretion of them within the body away from vulnerable tissues and decreased penetration through the body wall.[24]

Mutation in only a single gene can lead to the evolution of a resistant organism. In other cases, multiple genes are involved. Resistant genes are usually autosomal. This means that they are located on autosomes (as opposed to allosomes, also known as sex chromosomes). As a result, resistance is inherited similarly in males and females. Also, resistance is usually inherited as an incompletely dominant trait. When a resistant individual mates with a susceptible individual, their progeny generally has a level of resistance intermediate between the parents.[citation needed]

Adaptation to pesticides comes with an evolutionary cost, usually decreasing relative fitness of organisms in the absence of pesticides. Resistant individuals often have reduced reproductive output, life expectancy, mobility, etc. Non-resistant individuals sometimes grow in frequency in the absence of pesticides - but not always[25] - so this is one way that is being tried to combat resistance.[26]

Blowfly maggots produce an enzyme that confers resistance to organochloride insecticides. Scientists have researched ways to use this enzyme to break down pesticides in the environment, which would detoxify them and prevent harmful environmental effects. A similar enzyme produced by soil bacteria that also breaks down organochlorides works faster and remains stable in a variety of conditions.[27]

Resistance to gene drive forms of population control is expected to occur and methods of slowing its development are being studied.[28]

The molecular mechanisms of insecticide resistance only became comprehensible in 1997. Guerrero et al 1997 used the newest methods of the time to find mutations producing pyrethroid resistance in dipterans. Even so, these adaptations to pesticides were unusually rapid and may not necessarily represent the norm in wild populations, under wild conditions. Natural adaptation processes take much longer and almost always happen in response to gentler pressures.[29]


This section needs expansion. You can help by adding to it. (January 2021)

In order to remediate the problem it first must be ascertained what is really wrong. Assaying of suspected pesticide resistance - and not merely field observation and experience - is necessary because it may be mistaken for failure to apply the pesticide as directed, or microbial degradation of the pesticide.[30]

The United Nation's World Health Organization established the Worldwide Insecticide resistance Network in March 2016,[31][32][33][34] due to increasing need and increasing recognition, including the radical decline in function against pests of vegetables.[31][32][33][34]

Integrated pest management

Main article: Integrated pest management

The Integrated pest management (IPM) approach provides a balanced approach to minimizing resistance.

Resistance can be managed by reducing use of a pesticide. This allows non-resistant organisms to out-compete resistant strains. They can later be killed by returning to use of the pesticide.

A complementary approach is to site untreated refuges near treated croplands where susceptible pests can survive.[35][36]

When pesticides are the sole or predominant method of pest control, resistance is commonly managed through pesticide rotation. This involves switching among pesticide classes with different modes of action to delay or mitigate pest resistance.[37] The Resistance Action Committees monitor resistance across the world, and in order to do that, each maintains a list of modes of action and pesticides that fall into those categories: the Fungicide Resistance Action Committee,[38] the Weed Science Society of America[39][40] (the Herbicide Resistance Action Committee no longer has its own scheme, and is contributing to WSSA's from now on),[41] and the Insecticide Resistance Action Committee.[42] The U.S. Environmental Protection Agency (EPA) also uses those classification schemes.[43]

Manufacturers may recommend no more than a specified number of consecutive applications of a pesticide class be made before moving to a different pesticide class.[44]

Two or more pesticides with different modes of action can be tankmixed on the farm to improve results and delay or mitigate existing pest resistance.[35]



Glyphosate-resistant weeds are now present in the vast majority of soybean, cotton, and corn farms in some U.S. states. Weeds resistant to multiple herbicide modes of action are also on the rise.[7]

Before glyphosate, most herbicides would kill a limited number of weed species, forcing farmers to continually rotate their crops and herbicides to prevent resistance. Glyphosate disrupts the ability of most plants to construct new proteins. Glyphosate-tolerant transgenic crops are not affected.[7]

A weed family that includes waterhemp (Amaranthus rudis) has developed glyphosate-resistant strains. A 2008 to 2009 survey of 144 populations of waterhemp in 41 Missouri counties revealed glyphosate resistance in 69%. Weed surveys from some 500 sites throughout Iowa in 2011 and 2012 revealed glyphosate resistance in approximately 64% of waterhemp samples.[7]

In response to the rise in glyphosate resistance, farmers turned to other herbicides—applying several in a single season. In the United States, most midwestern and southern farmers continue to use glyphosate because it still controls most weed species, applying other herbicides, known as residuals, to deal with resistance.[7]

The use of multiple herbicides appears to have slowed the spread of glyphosate resistance. From 2005 through 2010 researchers discovered 13 different weed species that had developed resistance to glyphosate. From 2010-2014 only two more were discovered.[7]

A 2013 Missouri survey showed that multiply-resistant weeds had spread. 43% of the sampled weed populations were resistant to two different herbicides, 6% to three and 0.5% to four. In Iowa a survey revealed dual resistance in 89% of waterhemp populations, 25% resistant to three and 10% resistant to five.[7]

Resistance increases pesticide costs. For southern cotton, herbicide costs climbed from between $50–$75 per hectare ($20–$30/acre) a few years ago to about $370 per hectare ($150/acre) in 2014. In the South, resistance contributed to the shift that reduced cotton planting by 70% in Arkansas and 60% in Tennessee. For soybeans in Illinois, costs rose from about $25–$160 per hectare ($10–$65/acre).[7]

Bacillus thuringiensis

During 2009 and 2010, some Iowa fields showed severe injury to corn producing Bt toxin Cry3Bb1 by western corn rootworm. During 2011, mCry3A corn also displayed insect damage, including cross-resistance between these toxins. Resistance persisted and spread in Iowa. Bt corn that targets western corn rootworm does not produce a high dose of Bt toxin, and displays less resistance than that seen in a high-dose Bt crop.[45]

Products such as Capture LFR (containing the pyrethroid bifenthrin) and SmartChoice (containing a pyrethroid and an organophosphate) have been increasingly used to complement Bt crops that farmers find alone to be unable to prevent insect-driven injury. Multiple studies have found the practice to be either ineffective or to accelerate the development of resistant strains.[46]

See also


  1. ^ a b c PBS (2001), Pesticide resistance. Retrieved on September 15, 2007.
  2. ^ Guedes, R.N.C.; Smagghe, G.; Stark, J.D.; Desneux, N. (2016-03-11). "Pesticide-Induced Stress in Arthropod Pests for Optimized Integrated Pest Management Programs". Annual Review of Entomology. Annual Reviews. 61 (1): 43–62. doi:10.1146/annurev-ento-010715-023646. ISSN 0066-4170. PMID 26473315. S2CID 207747295.
  3. ^ "Resistance Definition". Insecticide Resistance Action Committee. 2007.
  4. ^ How pesticide resistance develops Archived 2007-08-17 at the Wayback Machine. Excerpt from: Larry Gut, Annemiek Schilder, Rufus Isaacs and Patricia McManus. Fruit Crop Ecology and Management, Chapter 2: "Managing the Community of Pests and Beneficials." Retrieved on September 15, 2007.
  5. ^ a b c Miller GT (2004), Sustaining the Earth, 6th edition. Thompson Learning, Inc. Pacific Grove, California. Chapter 9, Pages 211-216.
  6. ^ Levine, E; Oloumi-Sadeghi, H; Fisher, JR (1992). "Discovery of multiyear diapause in Illinois and South Dakota Northern corn rootworm (Coleoptera: Cerambycidae) eggs and incidence of the prolonged diapause trait in Illinois". Journal of Economic Entomology. 85: 262–267. doi:10.1093/jee/85.1.262.
  7. ^ a b c d e f g h Service, Robert F. (20 September 2013). "What Happens When Weed Killers Stop Killing?". Science. 341 (6152): 1329. doi:10.1126/science.341.6152.1329. PMID 24052282.
  8. ^ Guedes, R. N. C.; Roditakis, E.; Campos, M. R.; Haddi, K.; Bielza, P.; Siqueira, H. A. A.; Tsagkarakou, A.; Vontas, J.; Nauen, R. (2019-01-31). "Insecticide resistance in the tomato pinworm Tuta absoluta: patterns, spread, mechanisms, management and outlook". Journal of Pest Science. Springer. 92 (4): 1329–1342. doi:10.1007/s10340-019-01086-9. ISSN 1612-4758. S2CID 59524736.
  9. ^ Ferro, DN (1993). "Potential for resistance to Bacillus thuringiensis: Colorado potato beetle (Coleoptera: Chrysomelidae) – a model system". American Entomologist. 39: 38–44. doi:10.1093/ae/39.1.38.
  10. ^ Bishop, B. A.; Grafius, E. J. (1996). "Insecticide resistance in the Colorado potato beetle". In Jolivet, Pierre H. A.; Cox, M. L. (eds.). Chrysomelidae biology. Vol. 1. New York, N.Y: SPB Academic Publishing. ISBN 978-9051031232. OCLC 36335993. ISBN 90-5103-123-8. AGRIS id US201300312340.
  11. ^ a b c d e f g h i j k l m Daly H, Doyen JT, and Purcell AH III (1998), Introduction to insect biology and diversity, 2nd edition. Oxford University Press. New York, New York. Chapter 14, Pages 279-300.
  12. ^ a b Jørgensen, Peter Søgaard; Folke, Carl; Carroll, Scott P. (2019-11-02). "Evolution in the Anthropocene: Informing Governance and Policy". Annual Review of Ecology, Evolution, and Systematics. Annual Reviews. 50 (1): 527–546. doi:10.1146/annurev-ecolsys-110218-024621. ISSN 1543-592X. S2CID 202846760.
  13. ^ Doris Stanley (January 1996), Natural product outdoes malathion - alternative pest control strategy. Retrieved on September 15, 2007.
  14. ^ Mouchet, Jean (1988). "Agriculture and Vector Resistance". International Journal of Tropical Insect Science. Cambridge University Press (CUP). 9 (3): 297–302. doi:10.1017/s1742758400006238. ISSN 1742-7584. S2CID 85650599.
  15. ^ Roberts, Donald R.; Manguin, S; Mouchet, J (2000). "DDT house spraying and re-emerging malaria". The Lancet. Elsevier. 356 (9226): 330–332. doi:10.1016/s0140-6736(00)02516-2. ISSN 0140-6736. PMID 11071203. S2CID 19359748.
  16. ^ Andrew Leonard (August 27, 2008). "Monsanto's bane: The evil pigweed". Salon.
  17. ^ "Palmer Amaranth (Pigweed)". Take Action Pesticide Resistance Management. 2020-09-21. Retrieved 2021-09-22.
  18. ^ Alyokhin, A.; Baker, M.; Mota-Sanchez, D.; Dively, G.; Grafius, E. (2008). "Colorado potato beetle resistance to insecticides". American Journal of Potato Research. 85 (6): 395–413. doi:10.1007/s12230-008-9052-0. S2CID 41206911.
  19. ^ Janmaat, Alida F.; Myers, Judith (2003-11-07). "Rapid evolution and the cost of resistance to Bacillus thuringiensis in greenhouse populations of cabbage loopers, Trichoplusia ni". Proceedings of the Royal Society of London B: Biological Sciences. 270 (1530): 2263–2270. doi:10.1098/rspb.2003.2497. ISSN 0962-8452. PMC 1691497. PMID 14613613.
  20. ^ Kain, Wendy C.; Zhao, Jian-Zhou; Janmaat, Alida F.; Myers, Judith; Shelton, Anthony M.; Wang, Ping (2004). "Inheritance of Resistance to Bacillus thuringiensis Cry1Ac Toxin in a Greenhouse-Derived Strain of Cabbage Looper (Lepidoptera: Noctuidae)". Journal of Economic Entomology. 97 (6): 2073–2078. doi:10.1603/0022-0493-97.6.2073. PMID 15666767. S2CID 13920351.[permanent dead link]
  21. ^ Endepols, Stefan; Buckle, Alan; Eason, Charlie; Pelz, Hans-Joachim; Meyer, Adrian; Berny, Philippe; Baert, Kristof; Prescott, Colin (September 2015). "RRAC guidelines on Anticoagulant Rodenticide Resistance Management" (PDF). RRAC. Brussels: CropLife. pp. 1–29.
  22. ^ Roberts, Donald R.; Andre, Richard G. (1994-01-01). "Insecticide Resistance Issues in Vector-Borne Disease Control". The American Journal of Tropical Medicine and Hygiene. American Society of Tropical Medicine and Hygiene. 50 (6 Supplemental): 21–34. doi:10.4269/ajtmh.1994.50.21. ISSN 0002-9637. PMID 8024082.
  23. ^ Berenbaum, May (1995). Bugs In The System: Insects And Their Impact On Human Affairs. Reading, Mass: Addison-Wesley. pp. xvi+377. ISBN 978-0-201-62499-1. OCLC 30157272.
  24. ^ Yu, Simon J. (2008). The Toxicology and Biochemistry of Insecticides. Boca Raton: CRC Press/Taylor & Francis. p. 296. ISBN 978-1-4200-5975-5. OCLC 190620703. ISBN 1420059750.
  25. ^ David, Mariana Rocha; Garcia, Gabriela Azambuja; Valle, Denise; Maciel-De-Freitas, Rafael (2018). "Insecticide Resistance and Fitness: The Case of Four Aedes aegypti Populations from Different Brazilian Regions". BioMed Research International. 2018: 1–12. doi:10.1155/2018/6257860. PMC 6198578. PMID 30402487.
  26. ^ Stenersen, J. 2004. Chemical Pesticides: Mode of Action and Toxicology. CRC Press, Boca Raton.
  27. ^ Marino M. (August 2007), Blowies inspire pesticide attack: Blowfly maggots and dog-wash play starring roles in the story of a remarkable environmental clean-up technology Archived 2008-02-18 at the Wayback Machine. Solve, Issue 12. CSIRO Enquiries. Retrieved on 2007-10-03.
  28. ^ Dhole, Sumit; Lloyd, Alun L.; Gould, Fred (2020-11-02). "Gene Drive Dynamics in Natural Populations: The Importance of Density Dependence, Space, and Sex". Annual Review of Ecology, Evolution, and Systematics. Annual Reviews. 51 (1): 505–531. arXiv:2005.01838. doi:10.1146/annurev-ecolsys-031120-101013. ISSN 1543-592X. PMC 8340601. PMID 34366722.
  29. ^ Jakobson, Christopher M.; Jarosz, Daniel F. (2020-11-23). "What Has a Century of Quantitative Genetics Taught Us About Nature's Genetic Tool Kit?". Annual Review of Genetics. Annual Reviews. 54 (1): 439–464. doi:10.1146/annurev-genet-021920-102037. ISSN 0066-4197. PMID 32897739. S2CID 221570237.
  30. ^ Waddington, Donald V; Carrow, Robert N; Shearman, Robert C (1992). Turfgrass. Madison, Wisconsin, United States: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America. p. 682. ISBN 978-0-89118-108-8. OCLC 25048047. [It] is necessary to determine if the cause of the problem is actually resistance, an application problem, or perhaps enhanced microbial degradation of the pesticide.
  31. ^ a b Corbel, Vincent; Achee, Nicole L.; Chandre, Fabrice; Coulibaly, Mamadou B.; Dusfour, Isabelle; Fonseca, Dina M.; Grieco, John; Juntarajumnong, Waraporn; Lenhart, Audrey; Martins, Ademir J.; Moyes, Catherine; Ng, Lee Ching; Pinto, João; Raghavendra, Kamaraju; Vatandoost, Hassan; Vontas, John; Weetman, David; Fouque, Florence; Velayudhan, Raman; David, Jean-Philippe (2016-12-01). Barrera, Roberto (ed.). "Tracking Insecticide Resistance in Mosquito Vectors of Arboviruses: The Worldwide Insecticide resistance Network (WIN)". PLOS Neglected Tropical Diseases. Public Library of Science (PLoS). 10 (12): e0005054. doi:10.1371/journal.pntd.0005054. ISSN 1935-2735. PMC 5131894. PMID 27906961.
  32. ^ a b "WIN network / IRD". WIN network / Research Institute for Development (in French). 2020-12-02. Retrieved 2021-01-03.
  33. ^ a b "Worldwide Insecticide Resistance Network (WIN)". MIVEGEC (in French). Retrieved 2021-01-03.
  34. ^ a b "New global network tracking insecticide resistance on vectors of arboviruses". World Health Organization. 2016-03-30. Retrieved 2021-01-03.
  35. ^ a b Chris Boerboom (March 2001), Glyphosate resistant weeds. Weed Science - University of Wisconsin. Retrieved on September 15, 2007
  36. ^ Onstad, D.W. 2008. Insect Resistance Management. Elsevier: Amsterdam.
  37. ^ Graeme Murphy (December 1, 2005), Resistance Management - Pesticide Rotation Archived 2007-10-13 at the Wayback Machine. Ontario Ministry of Agriculture, Food and Rural Affairs. Retrieved on September 15, 2007
  38. ^ FRAC (Fungicide Resistance Action Committee) (March 2021). "FRAC Code List ©*2021: Fungal control agents sorted by cross resistance pattern and mode of action (including coding for FRAC Groups on product labels)" (PDF).
  39. ^ Weed Science Society of America. "Summary of Herbicide Mechanism of Action According to the Weed Science Society of America (WSSA)" (PDF).
  41. ^ "HRAC MOA 2020 Revision Description and Master Herbicide List". Herbicide Resistance Action Committee. 2020-09-14. Retrieved 2021-04-01.
  42. ^ "Interactive MoA Classification". Insecticide Resistance Action Committee. 2020-09-16. Retrieved 2021-04-01.
  44. ^ "Colorado Potato Beetle Damage and Life History". Archived from the original on 2011-06-06.
  45. ^ Gassmann, Aaron J.; Petzold-Maxwell, Jennifer L.; Clifton, Eric H.; Dunbar, Mike W.; Hoffmann, Amanda M.; Ingber, David A.; Keweshan, Ryan S. (April 8, 2014). "Field-evolved resistance by western corn rootworm to multiple Bacillus thuringiensis toxins in transgenic maize" (PDF). PNAS. 111 (14): 5141–5146. Bibcode:2014PNAS..111.5141G. doi:10.1073/pnas.1317179111. PMC 3986160. PMID 24639498.
  46. ^ Kaskey, Jack (June 11, 2014). "War on Cornfield Pest Sparks Clash Over Insecticide". Bloomberg News.

Further reading