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

摘要： 目的 了解陕西省伊蚊分布地区铜川及安康市白纹伊蚊抗药性情况。方法 采用区分剂量法测定白纹伊蚊幼虫对3种杀虫剂的24 h死亡率;采用半数致死剂量(LC₅₀)法测定白纹伊蚊幼虫对9种杀虫剂的LC₅₀。结果 区分剂量法测定结果显示,铜川和安康地区白纹伊蚊对敌敌畏、氯菊酯、溴氰菊酯均为抗性群体;半数致死量法测定结果显示,安康、铜川市白纹伊蚊对高效氯氰菊酯的LC₅₀分别为0.003 71和0.001 45 mg/L;对氯菊酯的LC₅₀分别为0.006 25 和0.017 67 mg/L;对溴氰菊酯的LC₅₀分别为0.002 69和0.000 76 mg/L;对氯氰菊酯的LC₅₀分别为0.017 46和0.009 37 mg/L;对DDT的LC₅₀分别为0.809 54和0.217 06 mg/L;对敌敌畏的LC₅₀分别为0.040 15和0.026 77 mg/L;对双硫磷的LC₅₀分别为0.002 22和0.003 10 mg/L;对残杀威的LC₅₀分别为0.348 14和0.651 91 mg/L;对仲丁威的LC₅₀分别为0.157 19和0.543 77 mg/L;抗性倍数以敌敌畏、双硫磷、残杀威等较高。结论 在应用杀虫剂防治媒介伊蚊时,应结合地理区域及生态环境特点对蚊虫进行综合治理,科学合理地使用杀虫剂,以减缓抗药性的产生。

关键词: 白纹伊蚊, 杀虫剂, 抗药性