宁夏部分地区淡色库蚊幼虫对4种杀虫剂的敏感性调查

目的 了解宁夏回族自治区（宁夏）部分地区淡色库蚊幼虫对4种杀虫剂的敏感性状况。方法 采用浸渍法,测定淡色库蚊幼虫现场种群的半数致死浓度（LC50）。结果 与文献报道的敏感品系试虫比较,银川市淡色库蚊幼虫对高效氯氰菊酯、溴氰菊酯、敌敌畏、仲丁威抗性系数分别为1.00、1.00、1.74和0.34倍,石嘴山市淡色库蚊幼虫对高效氯氰菊酯、溴氰菊酯、敌敌畏、仲丁威抗性系数分别为0.67、0.50、0.22和0.10倍,调查结果显示,两市4种杀虫剂均处于敏感水平。结论 银川和石嘴山市淡色库蚊幼虫对4种杀虫剂尚未产生抗药性,4种杀虫剂均可应用。

Survey on susceptibility of Culex pipiens paUens larvae to four insecticides in Ningxia,China

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.