Bioassay of Acetaniprid and Imidacloprid on Melon Aphid

There were a lots of plant host on which Aphis gossypii feeds.Melon,bean,cotton and tobacco were heavily damaged by this species.When adults and nymphs damage on new leaves and new development points the plant could not regularly grow;the old damaged leaves turn yellow and drop off.This aphid could live and damage on cucumber in the whole year in greenhouse.Chemical control was a main method of integrated pest management which has a good efficiency on population of melon aphid.By Petri-dish bioassay the toxin of acetamiprid and imidacloprid on melon aphid were tested.Under 10～80 mg/kg the efficacy of imidacloprid(54.20%～89.04%) was higher than that of acetamiprid(35.45%～87.34%);LC50 of acetamiprid was 14.0685 mg/L and imidacloprid 9.674 mg/L,the toxin of later was 1.45 times of former.