Insecticide susceptibility of the dengue vector Aedes aegypti (Diptera: Culicidae) in Lahore City, Pakistan

Insecticide susceptibility of the dengue vector Aedes aegypti (Diptera: culicidae) in Lahore City, Pakistan Farkhanda manzoor1, Rooma Adalat, Ghazala Yasmin2 Ruhma Syed1, Abida Abdul Sattar1 Department of zoology, Lahore college for women university, Lahore1 Abstract Present studies were carried out to examine the insecticide susceptibility of larval and adults of Aedes aegypti (Ae. aegypti) from laboratory and field populations of Lahore. Four major groups of commonly used insecticides against Aedes aegypti i.e neo-nicotenoids (imidacloprid 5% SC), phenyl-pyrazoles (fipronil 2.5% EC), pyrethroids (deltamethrin 2.5% SC) and organophosphates (DDVP 50% EC) were tested against Aedes aegypti, the common vector of dengue, according to WHO standard procedures. Larval and adult toxicity results were different for Wild and laboratory strains exposed to different groups of insecticides. Regression analysis showed significant trends in mortality. Imidacloprid proved to be the most toxic with LC50= 0.001 in wild larval strains of Aedes aegypti collected from different localities of Lahore while fipronil was most effective with LC50 values of 0.005 µlitre/ml for wild larval samples.For both adults and larval strains deltamethrin showed least efficacy representing its high tolerance and resistance against pyrethroids. Laboratory samples were more resistant than field samples as resistant ratio varies (2.5-10) from insecticides to insecticides. Key words: Ae. aegypti - insecticides – Punjab -neo-nicotenoids - phenyl-pyrazoles - organophosphates -LC50