浙江省4个地区2018年登革热媒介白纹伊蚊密度及抗药性监测

Surveillance of insecticide resistance and density of the dengue vector Aedes albopictus in four prefectures of Zhejiang province,China,2018

目的了解浙江省4个地区的登革热媒介白纹伊蚊密度消长及对常用杀虫剂的抗性水平,为合理选择和使用杀虫剂,科学防控登革热疫情提供科学依据。方法2018年4-11月,在浙江省的杭州、宁波、衢州和义乌4个地区,用双层叠帐法监测白纹伊蚊成蚊密度;采集幼蚊,饲养至成蚊进行诊断剂量法的抗药性测定。结果浙江省4个地区全年帐诱指数平均为1.33只/(顶·h);居民区帐诱指数为1.60只/(顶·h),在3个生境中最高。杭州种群对3种菊酯类杀虫剂和马拉硫磷敏感,对残杀威为可疑抗性。宁波种群对高效氯氰菊酯敏感,对溴氰菊酯、氯菊酯和残杀威为可疑抗性,对马拉硫磷已经产生抗性。衢州和义乌种群对马拉硫磷敏感,对3种菊酯类杀虫剂和残杀威为可疑抗性。4个地区对5种杀虫剂产生抗性的占5.00%,产生可疑抗性的占60.00%,呈敏感的占35.00%。结论2018年浙江省4个地区中,居民区和公园的白纹伊蚊成蚊密度高峰在7月,对测试的杀虫剂产生了不同程度的抗性,加强密度消长和抗药性监测,可减缓抗药性产生,有效防控登革热疫情。

Objective To investigate the density fluctuation of the dengue vector Aedes albopictus and its resistance to commonly used insecticides in four regions of Zhejiang province,China,and to provide a basis for rational selection and use of insecticides and scientific prevention and control of dengue.Methods The density of adult Ae.albopictus was monitored by the double mosquito net method in four cities of Hangzhou,Ningbo,Quzhou,and Yiwu in Zhejiang province from April to November of 2018.The larvae were collected and reared to adults for determining resistance using the diagnostic doses of insecticides.Results The annual average net trap index was 1.33 mosquitoes/net·hour in the four prefectures of Zhejiang province,and that was 1.60 mosquitoes/net·hour in residential areas,which was the highest among three habitats.The Ae.albopictus population of Hangzhou was sensitive to three pyrethroids and malathion,and showed suspected resistance to propoxur.The mosquito population of Ningbo showed sensitive to beta-cypermethrin,suspected resistance to deltamethrin,permethrin,and propoxur,and resistance to malathion.The Ae.albopictus populations of Quzhou and Yiwu were sensitive to malathion,and exhibited suspected resistance to three pyrethroids and propoxur.Of the mosquito populations of the four cities,5.00%,60.00%,and 35.00% showed resistance,suspected resistance,and sensitivity to five insecticides,respectively.Conclusion In the four cities of Zhejiang province,the density of Ae.albopictus in residential areas and parks peaks in July.The mosquitoes develop varying degrees of resistance to the tested insecticides.Strengthening the surveillance of their density fluctuation and insecticide resistance contributes to slowing the development of resistance and effectively controlling dengue.