Susceptibility of adult Bactocera dorsalis (Diptera: Tephritidae) to commonly used chemical insecticides

In the present study,susceptibility of field-collected adult bactocera dorsalis to the insecticides,malathion,trichlorofon and λ-cyhalothrin,at fieldrecommended use rates was investigated in the laboratory. adult fly mortality was assessed at pre-determined post-treatment time intervals. the exposed b. dorsalis population was found to be susceptible to all tested insecticides. there was no difference in mortality among male and female flies exposed to malathion or trichlorofon; however,λ-cyhalothrin-treated males died,in significantly less time,than the females. the calculated ld50 and lt50 values suggested that malathion was more toxic than trichlorofon and λ-cyhalothrin. the toxicity data suggests that the tested insecticides are effective against b. dorsalis in the field-collected sites and could be economically used in the field for population management of the fruit fly. copyright © 2015 zoological society of pakistan.