Abstract:

Objective To investigate the susceptibility of Aedes albopictus larvae to four insecticides in some areas of Chongqing. Methods To determine the median lethal concentration (LC⁵⁰) of the field population of Ae. albopictus larvae of Yuzhong district and Wanzhou district located in the hinterland of the Three Gorges Reservoir, by immersing them with pesticide in 2014-2015. Results In comparison with the susceptible strain, the resistance ratios of Ae. albopictus larvae to beta-cypermethrin, deltamethrin, permethrin, and temephos were 7.59-, 4.50-, 9.88-, and 3.18-fold respectively in Yuzhong district, and 12.82-, 7.50-, 13.29-, and 2.00-fold respectively in Wanzhou. Conclusion Aedes albopictus larvae of Yuzhong had a low level resistance to beta-cypermethrin, deltamethrin, permethrin, and temephos; that of Wanzhou had a moderate resistance to beta-cypermethrin and permethrin, but a low level resistance to deltamethrin. Therefore, it is important to rotate pesticides and choose appropriate doses in mosquito control.

Key words: Aedes albopictus, Dipping method, Susceptibility, Insecticide

摘要：

目的 了解重庆市登革热传播媒介白纹伊蚊幼虫对常用杀虫剂的敏感性。方法 于2014－2015年，选择主城区的渝中区和位于三峡库区腹地的万州区作为监测点，采用浸渍法，测定白纹伊蚊幼虫野外种群的半数致死浓度。结果 与敏感品系试虫相比较，渝中区白纹伊蚊对高效氯氰菊酯、溴氰菊酯、氯菊酯和双硫磷的抗性倍数分别为7.59、4.50、9.88和3.18倍；万州区白纹伊蚊对高效氯氰菊酯、溴氰菊酯、氯菊酯和双硫磷的抗性倍数分别为12.82、7.50、13.29和2.00倍。结论 渝中区白纹伊蚊对高效氯氰菊酯、氯菊酯、溴氰菊酯和双硫磷均产生低度抗性，万州区白纹伊蚊对高效氯氰菊酯、氯菊酯产生中度抗性，对溴氰菊酯产生低度抗性。在实际防治中应注意交替使用、合理用药。

关键词: 白纹伊蚊, 浸渍法, 敏感性, 杀虫剂