The Susceptibility of Bemisia Tabaciand Trialeurodes vaporariorum to Used Insecticides

The susceptibility of adults of Bemisia tabaci and Trialeurodes vaporariorum to 3 insecticides,imidacloprid,beta cypermethrin and dimethyl-dichloro-vinyl-phosphate was studied with the method of leaf-dip bioassay.Results suggested that the susceptibility of B.tabaci and T.vaporariorum,collected from same areas in Shandong to 3 insecticides,had been approximately same.High variability in the susceptibility to dimethyl-dichloro-vinyl-phosphate,beta cypermethrin and imidacloprid was noted,ranging from low(LC50=1383-1965mg/L) to medium(LC50=124-153mg/L) to high lethal concentration 50(LC50=60-95mg/L).But T.vaporariorum(Qingdao) to imidacloprid had generated the medium level resistance.So we should streng their resistance monitoring.