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Updates from the Daily News Blog

Farmers and Farmworkers Face DNA and Cellular Damage with Chronic Pesticide Exposure, Study Finds
May 29, 2025

Sleep Disorders in Farmers and Farmworkers Linked to Pesticide Exposure in Study Supporting Similar Findings
January 31, 2025

Pesticides Not Only Linked to Parkinson’s Disease Development, But Accelerating Disease Symptoms
January 12, 2023

Report Finds Banned, Illegal Pesticides in Popular Indian Tea Brands
August 14, 2014

Chinese Herbs Found To Be Tainted With Pesticides
June 25, 2013

New Study Links Suicidal Thoughts to Pesticides
October 26, 2009

Farmworkers Face Highest Risk of Pesticide Poisonings, EPA Worker Protection Standards Failing
December 8, 2008

Lawsuit Challenges EPA on Four Deadly Pesticides
April 7, 2008

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Methamidophos

General Information

• Product Names:

  No currently registered products

• Chemical Class: Organophosphate insecticide
• Uses: cotton, potato, tomato and alfalfa grown for seed for broad spectrum insect control, including aphid, Colorado potato beetle, green peach aphid, leafhopper, leafminer, lygus bug, stink bug, tomato pinworm and whitefly. Also used on peppers, strawberries, and squash grown in other countries and imported into the U.S.
• Alternatives: Organic Agriculture
  
• Beyond Pesticides rating: Toxic

Health and Environmental Effects

• Cancer: Not documented
• Endocrine Disruption: Not documented
• Reproductive Effects: Yes (1)
• Neurotoxicity: Yes (1)
• Kidney/Liver Damage: Yes (1)
• Sensitizer/ Irritant: Yes (2)
• Birth/Developmental: Not documented
• Detected in Groundwater: Not documented
• Potential Leacher: Not documented
• Toxic to Birds: Yes (2)
• Toxic to Fish/Aquatic Organisms: Yes (2)
• Toxic to Bees: Yes (2)

Additional Information

• Regulatory Status:
  • EPA Reregistration Eligibility Decision (RED) (7/2006)
• Supporting information:
  • Extoxnet Methamidophos Factsheet (Extension Toxicology Network)
  • PAN Pesticides Database - Methamidophos (Pesticide Action Network)
• Studies [compiled from the Pesticide-Induced Diseases Database]
  • The Washington aerial spray drift study: assessment of off-target organophosphorus insecticide atmospheric movement by plant surface volatilization. Ramaprasad, J. et al. (2004) The Washington Aerial Spray Drift Study: Assessment of off-target organophosphorus insecticide atmospheric movement by Plant Surface Volatilization, Atmospheric Environment. Available at: https://www.sciencedirect.com/science/article/abs/pii/S1352231004005199.
  • Proximity to residential and workplace pesticides application and the risk of progression of Parkinson's diseases in Central California. Li, S. et al. (2022) Proximity to residential and workplace pesticides application and the risk of progression of parkinson’s diseases in Central California, Science of The Total Environment. Available at: https://www.sciencedirect.com/science/article/pii/S0048969722079542.
  • Child and adolescent mortality associated with pesticide toxicity in Cape Town, South Africa, 2010–2019: a retrospective case review. Davies, B., Hlela, M.B.K.M. and Rother, H.-A. (2023) Child and adolescent mortality associated with pesticide toxicity in Cape Town, South Africa, 2010–2019: a retrospective case review, BMC Public Health. Available at: https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-023-15652-5.
  • Pesticide exposure and sleep disorder: A cross-sectional study among Thai farmers. Juntarawijit, C. et al. (2025) Pesticide exposure and sleep disorder: A cross-sectional study among Thai farmers, Heliyon. Available at: https://www.cell.com/heliyon/fulltext/S2405-8440(24)17154-X.
  • Assessment of genetic damage levels in agricultural workers exposed to pesticides in Paraíba, Brazil. Carvalho-Gonçalves, L. et al. (2025) Assessment of genetic damage levels in agricultural workers exposed to pesticides in Paraíba, Brazil, Environmental Toxicology and Pharmacology. Available at: https://www.sciencedirect.com/science/article/abs/pii/S1382668925000900.
  • Cytotoxicity and DNA damage of five organophosphorus pesticides mediated by oxidative stress in PC12 cells and protection by vitamin E. Lu, X. T. et al. (2012) ‘Cytotoxicity and DNA damage of five organophosphorus pesticides mediated by oxidative stress in PC12 cells and protection by vitamin E’, Journal of Environmental Science and Health, Part B, 47(5), pp. 445–454. doi: 10.1080/03601234.2012.663312.
  • Monitoring of pesticide residues in Brazilian infant formulas using the suspect screening methodology by GC-HRMS. Galindo, Marcella & Vargas-Pérez, Marta & López-Ruiz, Rosalía & Oliveira, Wellington & Godoy, Helena & Frenich, Antonia & Romero-González, Roberto. (2024). Monitoring of pesticide residues in Brazilian infant formulas using the suspect screening methodology by GC-HRMS. Journal of Food Composition and Analysis. 139. 107166. 10.1016/j.jfca.2024.107166.