Sublethal effects of eight insecticides on development and reproduction of {\sl Bradysia odoriphaga}

Abstract

After the LC_(20) and LC_(50) of eight insecticides to the 3rd instar larvae of Bradysia odoriphaga were determined, the effects of eight insecticides in sublethal doses to the biology of survival larvae were compared. The biological parameters included larval mortality after 72 h, adult survival rate 72 h after emergence, pupation rate, female pupa weight, emergence rate, sex proportion (♀:♂), eggs laid per female and egg hatchability. For chlorpyrifos, phoxim, abamectin and chlorfenapyr, the effect of sublethal doses were significant and in the order chlorpyrifosphoximabamectin ≌ chlorfenapyr; but for benfuracarb, methomyl, carbosulfan, and imidacloprid, the effect was not obvious. Compared with the control, there were no differences except pupation rate and emergence rate in the survival individuals treated at the dose of LC_(50) with benfuracarb, methomyl, carbosulfan, imidacloprid.