关键词: 氯氰菊酯和B.t.iH-14混配制剂, 致乏库蚊, 毒效

Abstract: Objective:To study on the mixture insecticide efficacy against Culex pipiens quinquefaciatus larva.Method:Determining the LC₅₀.Result:Cypermethrin and Bacillus thuringensis mixture insecticide to sensitive Culex pipiens quinguefaciatus larva LC₅₀ was 0.0056mg/L,the guotiety was 0.98,which to resistant Culex pipiens quinquefaciatus larva LC₅₀ was 0.0545mg/L,the toxicity quotiety was 284.03,they have obvious synergistic action.Concoulion:On the dosage of 2.5mg/L consistancy to sensitive and resistant type,the killing efficiency was over 80% in the laboratory and validity time was 21 days.The efficiency quotiety was longer than that with 0.5mg/L Cypermethrin and 2.0mg/L B.t.I.H-14.But after 21 days,mixture insecticide efficiency quickly decreased.One month later,it was out of action.