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Updates from the Daily News Blog

With State Legislation Focused on Restricting Bee-Killing Pesticides, Advocates Call for Organic Transition
October 2, 2025

Waterway Contamination Findings with Neonicotinoid Insecticide a Threat to Aquatic Ecosystems and Biodiversity
January 24, 2025

“Forever Chemical” PFAS Drinking Water Rules Issued, Urgency to Shift from Petrochemicals Pesticides
April 17, 2024

EPA Urged to Stop Use of Misbranded "Minimum Risk" Pesticides, Step Up Oversight and Enforcement
September 22, 2021

Stamford, CT Passes Organic Land Ordinance Restricting Toxic Pesticide and Fertilizer Use on Public Property
September 14, 2021

Study Finds State Pollinator Protections Fall Short
February 7, 2019

Connecticut State Legislature Bans Residential Mosquito Misters
May 23, 2018

Minnesota Governor Issues Executive Order Protecting Pollinators from Pesticides
August 30, 2016

Decrease Found in Retail Sales of Plants Treated with Bee-Toxic Pesticides
August 17, 2016

Connecticut Legislature Votes Unanimously to Adopt Pollinator Protections
May 3, 2016

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Lambda-cyhalothrin

General Information

• Product Names:

  Karate (Syngenta)
  Impasse (Syngenta)
  Demand (Syngenta)
  Wasp & Hornet Killer (Chemsico), formulated with Prallethrin
  Saber (Schering-Plough Animal Health), formulated with Piperonyl butoxide (some formulations)

• Chemical Class: Synthetic pyrethroid insecticide
• Uses: Agriculture, residential, mosquitoes
• Alternatives: Organic agriculture, Least toxic residential products, Least toxic mosquito products
• Beyond Pesticides rating: Toxic

Health and Environmental Effects

• Cancer: Not documented
• Endocrine Disruption: Yes (1)
• Reproductive Effects: Not documented
• Neurotoxicity: Yes (2)
• Kidney/Liver Damage: Not documented
• Sensitizer/ Irritant: Yes (2)
• Birth/Developmental: Not documented
• Detected in Groundwater: Not documented
• Potential Leacher: Not documented
• Toxic to Birds: Not documented
• Toxic to Fish/Aquatic Organisms: Yes (2)
• Toxic to Bees: Yes (2, 3)

Residential Uses as Found in the ManageSafe™ Database

• Bagworms
• Bed Bugs
• Carpenter Bees
• Centipedes
• Chiggers
• Chinch Bugs
• Gypsy Moths
• Spiders
• Carpenter Ants
• Grubs
• Ticks
• Wasps and Yellowjackets

Additional Information

• Regulatory Status:
  • EPA Office of Pesticide Programs
  • EPA Lambda-cyhalothrin classification and endpoints (2022)
• Supporting information:
  • NPIC Factsheet (National Pesticide Information Center)
  • Asthma, Children and Pesticides (Beyond Pesticides)
  • Children & Lawn Chemicals Don't Mix (Beyond Pesticides)
  • The Safer Choice (Beyond Pesticides)
  • Extoxnet Pesticide Factsheet (Extension Toxicology Network)
  • PAN Pesticides Database: Cyhalothrin, Lambda (Pesticide Action Network)
• Studies [compiled from the Pesticide-Induced Diseases Database]
  • Use and Toxicity of Pyrethroid Pesticides in the Central Valley,California, USA. Amweg, E. et. al. 2004.Environmental Toxicology and Chemistry 24(4):966-972
  • Indoor spraying with the pyrethroid insecticide lambda-cyhalothrin: effects on spraymen and inhabitants of sprayed houses.. Moretto A. 1991.Bull WHO 69 (5): 591-594
  • Lambda-cyhalothrin disrupts the up-regulation effect of 17β-estradiol on post-synaptic density 95 protein expression via estrogen receptor α-dependent Akt pathway.. Wang Q, Xia X, Deng X, Li N, et al. 2016. J Environ Sci (China). 41:252-60.
  • Haematological and biochemical toxicity in freshwater fish Clarias gariepinus and Oreochromis niloticus following pulse exposure to atrazine, mancozeb, chlorpyrifos, lambda-cyhalothrin, and their combination. Kanu, K.C., Okoboshi, A.C. and Otitoloju, A.A., 2023. Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology, 270, p.109643.
  • Assessing pyrethroid resistance in Aedes aegypti from Cordoba Colombia: Implications of kdr mutations. Atencia–Pineda, M.C. et al. (2024) Assessing pyrethroid resistance in Aedes aegypti from Cordoba colombia: Implications of KDR mutations, PLOS ONE. Available at: https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0309201.
  • Insecticide Resistance and Its Intensity in Populations of Malaria Vectors in Colombia. Orjuela, L. et al. (2018) Insecticide Resistance and Its Intensity in Populations of Malaria Vectors in Colombia, BioMed Research International. Available at: https://onlinelibrary.wiley.com/doi/10.1155/2018/9163543.
  • Pesticides and prostate cancer incidence and mortality: An environment-wide association study. Soerensen, S. et al. (2024) Pesticides and prostate cancer incidence and mortality: An environment-wide association study, Cancer. Available at: https://acsjournals.onlinelibrary.wiley.com/doi/10.1002/cncr.35572.
  • Lambda-cyhalothrin alters locomotion, mood and memory abilities in Swiss mice. Assmaa Tali, Nadra Lekouch, Samir Ahboucha, Lambda-cyhalothrin alters locomotion, mood and memory abilities in Swiss mice, Food and Chemical Toxicology, Volume 188, 2024, 114680, ISSN 0278-6915, https://doi.org/10.1016/j.fct.2024.114680.
  • Impact of Endocrine Disrupting Pesticide Use on Obesity: A Systematic Review. Pérez-Bermejo, M. et al. (2024) Impact of Endocrine Disrupting Pesticide Use on Obesity: A Systematic Review, Biomedicines. Available at: https://www.mdpi.com/2227-9059/12/12/2677.
  • Assessing pesticide residue occurrence and risks in the environment across Europe and Argentina. Alaoui, A., Christ, F., Abrantes, N., Silva, V., González, N., Gai, L., Harkes, P., Navarro, I., Torre, A., Martínez, M. Á., Norgaard, T., Vested, A., Schlünssen, V., Aparicio, V. C., Campos, I., Pasković, I., Pasković, M. P., Glavan, M., Ritsema, C., & Geissen, V. (2024). Assessing pesticide residue occurrence and risks in the environment across Europe and Argentina. Environmental pollution (Barking, Essex : 1987), 363(Pt 1), 125056. https://doi.org/10.1016/j.envpol.2024.125056
  • Toxicokinetic model of the pyrethroid pesticide lambda-cyhalothrin, main exposure route and dose reconstruction predictions in agricultural workers. Côté J, Bouchard M (2024) Toxicokinetic model of the pyrethroid pesticide lambda-cyhalothrin, main exposure route and dose reconstruction predictions in agricultural workers. PLoS ONE 19(10): e0309803. https://doi.org/10.1371/journal.pone.0309803
  • Eco(geno)toxicity of the new commercial insecticide Platinum Neo, a mixture of the neonicotinoid thiamethoxam and the pyrethroid lambda-cyhalothrin. Dalpiaz, F. L., Laçoli, R., Butzke-Souza, N., Santin, J. R., Poyer-Radetski, L., Dallabona, J. A., Testolin, R. C., Almeida, T. C. M., Radetski, C. M., & Cotelle, S. (2024). Eco(geno)toxicity of the new commercial insecticide Platinum Neo, a mixture of the neonicotinoid thiamethoxam and the pyrethroid lambda-cyhalothrin. Environmental pollution (Barking, Essex : 1987), 358, 124485. https://doi.org/10.1016/j.envpol.2024.124485
  • Assessing ecological responses of exposure to the pyrethroid insecticide lambda-cyhalothrin in sub-tropical freshwater ecosystems. Yao, K. S., Van de Perre, D., Lei, H. J., Bai, H., Zhou, P. L., Ying, G. G., & Van den Brink, P. J. (2024). Assessing ecological responses of exposure to the pyrethroid insecticide lambda-cyhalothrin in sub-tropical freshwater ecosystems. The Science of the total environment, 952, 176022. https://doi.org/10.1016/j.scitotenv.2024.176022
  • Combined toxic effects of polyethylene microplastics and lambda-cyhalothrin on gut of zebrafish (Danio rerio). Zhao, Y., Chen, H., Liang, H., Zhao, T., Ren, B., Li, Y., Liang, H., Liu, Y., Cao, H., Cui, N., & Wei, W. (2024). Combined toxic effects of polyethylene microplastics and lambda-cyhalothrin on gut of zebrafish (Danio rerio). Ecotoxicology and environmental safety, 276, 116296. https://doi.org/10.1016/j.ecoenv.2024.116296
  • Adverse Effects of Pesticides on the Ovary: Evidence from Epidemiological and Toxicological Studies. Wang, L., Ma, X. and Liu, J. (2025) Adverse Effects of Pesticides on the Ovary: Evidence from Epidemiological and Toxicological Studies, Environment & Health. Available at: https://pubs.acs.org/doi/full/10.1021/envhealth.4c00243.
  • Characterizing pyrethroid and fipronil concentrations in biosolids. Wheeler, J., Black, G. P., Hladik, M. L., Sanders, C. J., Teerlink, J., Wong, L., Zhang, X., Budd, R., & Young, T. M. (2025). Characterizing pyrethroid and fipronil concentrations in biosolids. The Science of the total environment, 969, 178954. https://doi.org/10.1016/j.scitotenv.2025.178954
  • Antigonadal and endocrine-disrupting activities of lambda cyhalothrin in female rats and its attenuation by taurine. Ghosh R, Banerjee B, Das T, Jana K, Choudhury SM. Antigonadal and endocrine-disrupting activities of lambda cyhalothrin in female rats and its attenuation by taurine. Toxicology and Industrial Health. 2018;34(3):146-157. doi:10.1177/0748233717742291
  • Species at Risk (SPEAR) index indicates effects of insecticides on stream invertebrate communities in soy production regions of the Argentine Pampas. Hunt, L., Bonetto, C., Marrochi, N., Scalise, A., Fanelli, S., Liess, M., Lydy, M. J., Chiu, M. C., & Resh, V. H. (2017). Species at Risk (SPEAR) index indicates effects of insecticides on stream invertebrate communities in soy production regions of the Argentine Pampas. The Science of the total environment, 580, 699–709. https://doi.org/10.1016/j.scitotenv.2016.12.016
  • Urinary pesticide biomarkers from adolescence to young adulthood in an agricultural setting in Ecuador: Study of secondary exposure to pesticides among children, adolescents, and adults (ESPINA) 2016 and 2022 examination data. Parajuli, R. et al. (2025) Urinary pesticide biomarkers from adolescence to young adulthood in an agricultural setting in Ecuador: Study of secondary exposure to pesticides among children, adolescents, and adults (ESPINA) 2016 and 2022 examination data, Data in Brief. Available at: https://www.sciencedirect.com/science/article/pii/S2352340925006067.