关键词: 致倦库蚊, 家蝇, 德国小蠊, 抗药性

Abstract: Objective To investigate the resistance of natural populations of Culex pipiens quinquefasciatus, Musca domestica, and Blattella germanica to 7 chemical insecticides in Taizhou city, China and to provide a basis for vector control using suitable insecticides. Methods The soaking method was used to determine the median lethal concentration (LC₅₀) for the 4th larval instar of Cx. pipiens quinquefasciatus; the droplet method was used to determine the median lethal dose (LD₅₀) for M. domestica; the residual film method was used to determine the median knockdown time (KT₅₀) for B. germanica. Results The resistance ratios of natural population of Cx. pipiens quinquefasciatus to deltamethrin, permethrin, beta-cypermethrin, dichlorvos, and fenobucarb were 9.0, 6.8, 5.6, 4.8, and 2.7, respectively; the resistance ratios of natural population of M. domestica to deltamethrin, beta- cypermethrin, cypermethrin, permethrin, dichlorvos, and tetramethrin were 31.9, 24.8, 15.6, 9.5, 9.2, and 4.4, respectively; the resistance ratios of natural population of B. germanica to beta-cypermethrin, deltamethrin, permethrin, and propoxur were 5.1, 3.5, 3.2, and 2.8, respectively. Conclusion In Taizhou, the natural populations of Cx. pipiens quinquefasciatus, M. domestica, and B. germanica are resistant to 7 chemical insecticides at different levels.

Key words: Culex pipiens quinquefasciatus, Musca domestica, Blattella germanica, Insecticide resistance