IRRITABILITY LEVEL OF ANOPHELES STEPHENSI(DIPTERA: C’ULICIDAE) TO PYRETHROID MPREGNATED NETS IN LABORATORY CONDITION

Abstract

In a laboratory study, irritancy of five pyrethroids impregnated nets including lambdacyhalothrin, permethrin, deltamethrin, cyfluthrin and etofenprox were evaluated against a strain of An.stephensi originated from Bandar Abbas, Iran. Mosquitoes were released into special cage impregnated with pyrethroids in one side. In order to measure the irritancy of insecticides, a circular hole was made on the body of cage to fit exit window trap. Impregnated nets with lambdacyhalothrin were 10 and 40mg/rn2. The concentrations for permethrin, deltamethrin, cyfluthrin and etefenprox were 200, 25, 40 and 25 mg/m2, respectively. The irritancy of pyrethroids was compared based on the number of mosquitoes repelled by insecticides and entered into window traps. Results of X2 test revealed that there are significant differences among different pyrethroids it terms of irritancy (P<0.005). The same results can be seen by two Indentations of lambdacyhalothrin (0.025