Susceptibility status of Aedes aegypti (Linnaeus) and Aedes albopictus (Skuse) (Diptera: Culicidae) to insecticides in southern Odisha, India

Abstract

Insecticides are a valuable resource in vector control programmes. The programmes primarily rely on the susceptibility of the vectors against the insecticides. The current study determined the insecticide susceptibility of two major dengue vectors, Aedes aegypti and Ae. albopictus in Koraput district of Odisha. Immature stages of dengue vectors were collected from domestic and adjoining mosquito breeding habitats and were reared to adult stage (F1), then exposed to insecticide impregnated papers. The treatments used were diagnostic concentration of organochlorines (4% DDT), pyrethroids (0.05% deltamethrin) and organophosphates (5% malathion). We found Ae. aegypti was resistant to DDT, deltamethrin and developed a possible resistance to malathion, while Ae. albopictus was resistant to DDT but susceptible to both malathion and deltamethrin. Hence there is an urgent need for implementation of proper insecticide resistance management strategies to control dengue vectors during outbreak.