关键词: 白纹伊蚊, 杀虫剂, 抗药性

Abstract: Objective To evaluate the insecticide resistance of Aedes albopictus in Tongchuan city and Ankang city of Shaanxi province, China. Methods Distinguishing dosage method was used to measure the mortality rates of Ae. albopictus larvae within 24 h of exposure to three insecticides; median lethal dose (LC₅₀) method was used to measure the LC₅₀ of nine insecticides for Ae. albopictus larvae. Results The distinguishing dosage method showed that Ae. albopictus in Ankang and Tongchuan had resistances to dichlorvos, permethrin, and deltamethrin. The LC₅₀ method showed that for Ae. albopictus in Ankang and Tongchuan, the LC₅₀ of β-cypermethrin was 0.003 71 mg/L and 0.001 45 mg/L, the LC₅₀ of permethrin was 0.006 25 mg/L and 0.017 67 mg/L, the LC₅₀ of deltamethrin was 0.002 69 mg/L and 0.000 76 mg/L, the LC₅₀ of cypermethrin was 0.017 46 mg/L and 0.009 37 mg/L, the LC₅₀ of DDT was 0.809 54 mg/L and 0.217 06 mg/L, the LC₅₀ of dichlorvos was 0.040 15 mg/L and 0.026 77 mg/L, the LC₅₀ of parathion was 0.002 22 mg/L and 0.003 10 mg/L, the LC₅₀ of propoxur was 0.348 14 mg/L and 0.651 91 mg/L, and the LC₅₀ of fenobucarb was 0.157 19 mg/L and 0.543 77 mg/L. Ae. albopictus in the two areas developed higher resistance ratios to dichlorvos, parathion, and propoxur than to other insecticides. Conclusion Insecticides should be used properly to control Ae. albopictus in a geographic area with certain ecological characteristics, so as to retard the development of insecticide resistance in Ae. albopictus.

Key words: Aedes albopictus, Insecticide, Insecticide resistance