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目的了解广州市登革热媒介白纹伊蚊对3种常用拟除虫菊酯类杀虫剂的抗药性现状,为合理使用杀虫剂提供依据。方法在广州市3个区采集白纹伊蚊幼虫,在实验室繁殖1~2代后,采用WHO成蚊滤纸接触法,观察蚊虫死亡率,测定其对3种拟除虫菊酯类杀虫剂的抗药性。结果荔湾区白纹伊蚊成蚊对溴氰菊酯、高效氯氰菊酯、氯菊酯产生了抗性;天河区和从化区成蚊对氯菊酯敏感,而对溴氰菊酯、高效氯氰菊酯则具初步抗性。结论对于此次试验中的3个区来说,在氯菊酯、高效氯氰菊酯、溴氰菊酯这3种杀虫剂中,氯菊酯的药效较好,天河区和从化区成蚊对此较为敏感,可作为目前首选使用的杀虫剂;从化区成蚊整体上来说对这3种杀虫剂的敏感性较高;天河区成蚊对于高效氯氰菊酯、溴氰菊酯抗药性强于从化区,荔湾区成蚊对于3种杀虫剂抗性最强。
Objective To understand the resistance status of dengue vector-mediated Aedes albopictus to three common pyrethroid insecticides in Guangzhou and to provide a basis for rational use of insecticides. Methods Aedes albopictus larvae were collected in 3 districts of Guangzhou City. After 1 to 2 generations of breeding in laboratory, the mortality rate of mosquitoes was observed by WHO filter paper contact method. The effects on the pyrethroid insecticides Resistance. Results Adult mosquitoes of Aedes albopictus in Liwan District had resistance to deltamethrin, alpha-cypermethrin and permethrin. Adult mosquitoes in Tianhe and Conghua were sensitive to permethrin, while deltamethrin and alpha-cypermethrin Preliminary resistance. Conclusion For the three plots in this trial, permethrin showed good efficacy among the three insecticides of permethrin, beta-cypermethrin, and deltamethrin This is more sensitive and can be used as the preferred insecticide at present; adult mosquitoes in Conghua area are generally more sensitive to these three insecticides; and adult mosquitoes in Tianhe District are more resistant to beta-cypermethrin and deltamethrin Conghua District, Liwan District adult mosquitoes for the three kinds of insecticides strongest.