Present Susceptibility Status of Culex Quinquefasciatus, Say to Four Insecticides at Mysore, India

The current susceptibility status of Culex quinquefasciatus at Mysore, India to four insecticides was determined using standard WHO larval bioassay method. Culex quinquefasciatus is the primary vector of lymphatic filariasis, an endemic disease in India in 17 states and 6 union territories with about 553 million people at risk of infection. So, an effort was made to determine the susceptibility of this mosquito to 3 chemical insecticides viz Deltamethrin, Lambdacyhalothrin, Propoxur and a biocide, Spinosad. Among these Spinosad was found to be the most effective insecticide with LC50 of 0.000002 ppm followed by Lambdacyhalothrin, Propoxur and Deltamethrin with LC50 values of 0.00001, 0.00013 and 0.00062 ppm respectively. The results revealed the importance of a biocide explored from nature maybe employed to prevent pollution and health hazards.