Susceptibility of Aedes aegypti, Culex quinquefasciatus Say, and Anopheles quadrimaculatus Say to 19 Pesticides with Different Modes of Action
AGRICULTURAL RESEARCH SERVICE GAINESVILLE FL CENTER FOR MEDICAL AGRICULTURAL AND VETERINARY ENTOMOLOGY
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To access the relative potency of pesticides to control adult mosquitoes, 19 pesticides with various modes of action were evaluated against Aedes aegypti, Culex quinquefasciatus Say, and Anopheles quadrimaculatus Say. On the basis of 24-h LD50 values after topical application, the only pesticide that had higher activity than permethrin was fipronil, with LD50 values lower than permethrin for 107-, 4,849-, and 2-fold against Ae. aegypti, Cx. quinquefasciatus Say, and An. quadrimaculatus Say, respectively. Abamectin, imidacloprid, spinosad, diazinon, and carbaryl showed slightly lower activity than permethrin 20-fold. However, bifenazate showed very low activity against the three mosquito species tested, with LD50 values higher than permethrin for 1000-fold. On the basis of 24-h LD50 values, Cx. quinquefasciatus was the least susceptible species to nine pesticides tested DNOC, azocyclotin, chlorfenapyr, carbaryl, spinosad, imidaclorid, diazinon, abamectin, and permethrin, whereas Ae. aegypti was the least susceptible species to six pesticides tested dicofol, amitraz, propargite, hydramethylnon, cyhexatin, and diafenthiuron, and An. quadrimaculatus was the least susceptible species to four pesticides tested bifenazate, pyridaben, indoxacarb, and fipronil. Our results revealed that different species of mosquitoes had different susceptibility to pesticides, showing the need to select the most efficacious compounds for the least susceptible mosquito species to achieve successful mosquito control.