关键词: 致倦库蚊, 家蝇, 抗药性, 浸渍法, 点滴法

Abstract: Objective To investigate the resistance ofCulex pipiens quinquefasciatusandMusca domesticato commonly used insecticides in Changsha, Yiyang, and Yueyang, Hunan province, China in 2011, and to provide a scientific guidance for the management of mosquitoes and houseflies.Methods The resistance of mosquitoes and houseflies to insecticides was determined by larval immersion and topical application, respectively.Results Cx. pipiens quinquefasciatusshowed resistance to all insecticides tested with the following resistance ratios: 1.14-2.86 fold to deltamethrin, 2.25-6.75 fold to beta-cypermethrin,1.00-17.24 fold to fenobucarb, and 25.00-65.00 fold to temephos, of which temephos resistance was the highest. Musca domesticawas also resistant to all insecticides tested in this study, with resistance ratios as follows: 36.13-109.13 fold to deltamethrin, 28.46-32.81 fold to beta-cypermethrin, 1.43-2.25 fold to DDVP, and 0.82-2.34 fold to propoxur; the resistance to chrysanthemum ester was the highest, with a peak value of 109.13 fold.Conclusion More efforts should be made to the resistance ofCx. pipiens quinquefasciatusandM. domesticato insecticides. It is necessary to enhance resistance monitoring and to use insecticides rationally, so as to prevent and reduce the development of pesticide resistance.

Key words: Culex pipiens quinquefasciatus, Musca domestica, Insecticide resistance, Immersionmethod, Dropping method