Abstract: Objective　To investigate the population density change of Culex pipiens pallens and its resistance to commonly used insecticides in Zhejiang province, China, and to provide a reference for mosquito control. Methods　Light traps were used to determine the population density of Cx. pipiens pallens. The larva immersion method was used to determine the resistance of Cx. pipiens pallens to commonly used insecticides. Results　The population density change of Cx. pipiens pallens showed a single?peak curve throughout the year, with a peak value in June, the highest average density among all habitats was found in rural households. Among different Cx. pipiens pallens populations, the resistance ratios to pyrethroids, organophosphorus, and carbamate were 1.31-20.43, 1.88-10.14, and 0.82-4.96, respectively. Most of field?collected mosquitoes showed resistance to pyrethroids at all sampling sites. Conclusion　June is a key month of mosquito control in Zhejiang province, since the peak population density of adult Cx. pipiens pallens appears in June. Considering the prevalence of pyrethroids resistance among mosquitoes, comprehensive mosquito control should be promoted to delay the development of resistance to insecticides.

Key words: Culex pipiens pallens, Density, Insecticide resistance

摘要： 目的　了解浙江省淡色库蚊种群密度变化情况和对常用杀虫剂的抗药性水平,为蚊虫防制提供依据。方法　采用诱蚊灯法检测淡色库蚊密度,采用幼虫浸渍法检测淡色库蚊对常用杀虫剂的抗药性水平。结果　淡色库蚊全年密度呈现单峰曲线变化,高峰在6月,此时各种生境中以农户的淡色库蚊平均密度最高;各地淡色库蚊种群对拟除虫菊酯类杀虫剂的抗性在1.31～20.43倍之间,对有机磷杀虫剂的抗性在1.88～10.14倍之间,对氨基甲酸酯类杀虫剂抗性在0.82～4.96倍之间。大部分现场淡色库蚊种群对拟除虫菊酯类杀虫剂产生了抗药性。结论　6月是浙江省淡色库蚊成蚊密度的高峰,也是防制的关键月份;针对蚊虫对拟除虫菊酯类杀虫剂普遍产生抗药性的问题,应该提倡蚊虫的综合防制,延缓蚊虫抗药性的发展。

关键词: 淡色库蚊, 密度, 抗药性