关键词: 淡色库蚊, 浸渍法, 敏感性, 杀虫剂

Abstract: Objective To investigate the sensitivity ofCulex pipiens pallenslarvae to four insecticides in some areas of Ningxia Hui Autonomous Region, China.Methods Immersion with pesticide was used to determine the median lethal concentration (LC50) for the field population of Cx. pipiens pallenslarvae. Results In comparison with the susceptible strain reported in literature, the resistance ratios ofCx. pipiens pallenslarvae to beta-cypermethrin, deltamethrin, DDVP, and fenobucarb were 1.00,1.00, 1.74, and 0.34 fold, respectively, in Yinchuan, and 0.67, 0.50, 0.22, and 0.10 fold, respectively, in Shizuishan. The results showed that mosquitoes in the two cities were all at the susceptible level to the four insecticides tested.Conclusion Culex pipiens pallenslarvae in Yinchuan and Shizuishan have not developed resistance to the four insecticides tested, which can be applied in mosquito control at this time.

Key words: Culex pipiens pallens, Immersion method, Sensitivity, Insecticide