DETERMINATION OF DISCRIMINATIVE DOSE OF FIVE PYRETHROIDS OF ANOPHELES STEPHENSI (CULICIDAE-DIPTERA)

Abstract

An attempt was made to determine the discriminative dose of a number of pyrethroid insecticides for An. stephensi tested on blood fed adult female 1 or 2 days against two strains, i.e. India and Bandar Abbass laboratory species in 1998. The tests were carried out according to WHO standard method in lots of 25 adult mosquitoes in 4 replicates. India and Bandar Abbas species of An. stephensi were tested with insecticides permethrin 0.1% , 0.25%, 0.75% and 1%, deltamethrin 0.005%, 0.0125%, 0.025%, 0.05% and 0.1%, lambdacyhalothrin 0.01%, 0.025%, 0.05%, 0.1% and 0.2%, cyflothrin 0.005%, 0.0125%, 0.025%, 0.5% and 0.1%, etophenprox 0.1%, 0.25%, 0.5%, 0.75% and 1% in 60 min exposure. Based on the results, discriminative dose were calculated for the above insecticide respectively 0.25%, 0.025%, 0.025% and 0.5% for two species. According to the results, An.stephensi has similar susceptibility to pyrethroid insecticides.