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Med Vet Entomol. 2017 Sep;31(3):306-311. doi: 10.1111/mve.12236. Epub 2017 Apr 19.

Permethrin and malathion LD90 values for Culex quinquefasciatus vary with topical application site.

Author information

Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture-Agricultural Research Service, Gainesville, FL, U.S.A.
Entomology and Nematology Department, University of Florida, Gainesville, FL, U.S.A.
Entomology and Nematology Department, Emerging Pathogens Institute, University of Florida, Gainesville, FL, U.S.A.
School of Forest Resources and Conservation, University of Florida, Gainesville, FL, U.S.A.


Prior research in multiple insect species has demonstrated that insecticide-induced mortality varies according to the body region exposed on the insect. This variation has been demonstrated in Culex quinquefasciatus Say (Diptera: Culicidae), but has not been quantified using dose-response curves. Applications of technical permethrin or malathion to one of three body regions on Cx. quinquefasciatus resulted in dose-response curves that were not equivalent to one another. The generated LD90 values and curves for each body region were compared with previously reported LD values for analogous sites in several mosquito species, specifically the mesothorax. Based on the present results, the permethrin and malathion LD50 and LD90 concentrations required for droplets impinging on the abdomen and mesothorax of Cx. quinquefasciatus when applied through ground-based spray systems utilized by mosquito control programmes were calculated.


autotomization; dose-response curve; droplet; sub-lethal effect

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