关键词: 淡色/致倦库蚊, 杀虫剂, 抗性, LC₅₀, 方差分析

Abstract: Objective The resistances of Culex pipiens pallens/quinquefasciatus to five insecticides,such as dichlorvos et al.,were investigated so as to make the corresponding control strategy and the intelligent usage of mosquitoes insecticides in Zhejiang. Methods Immersion method of pesticide was used to assay the medium lethal concentration (LC₅₀) of the fourth-instar larvae. Results The resistances of C.pipiens pallens/quinquefasciatus to fenobucarb and plifenate were lower than other usual pesticides,the mosquitoes showed the lower resistance ( RR<4 ). The resistance of the mosquitoes from Jinhua,Quzhou and Zhoushan to dichlorvos belonged to medium level,which RR ranged from 5.2 to 6.6 . The mosquitoes from Jinhua and Zhoushan were more sensitive to permethrin and deltamethrin than those from other areas,the resistance times were 12.2 and 12.0 ,respectively. Conclusion The present experiment showed that C.pipiens pallens/quinquefasciatus had the relative resistance to five different pesticides,and especially had higher resistance to permethrin and deltamethrin.