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目的探讨淡色库蚊残杀威抗性品系对几种化学杀虫剂的抗性发展及交互抗性,为合理使用杀虫剂提供依据。方法采用WHO标准生物测试法,计算LC50、回归方程及抗性指数。结果经过43代的选育,抗残杀威品系的抗性达11.21倍。在21代时,对残杀威、DDVP、氯氰菊酯、三氯杀虫酯、溴氰菊酯的抗性倍数分别是9.54、2.68、7.00、1.74、1.70倍;到第30代时,分别是11.34、2.85、8.07、2.00、1.80倍;到39代时,对残杀威抗性为11.78倍,对DDVP、氯氰菊酯的抗性分别为3.35倍、9.71倍。经过43代的选育,抗DDVP品系的抗性达12.17倍,在2l代时,对DDVP、残杀威、氯氰菊酯、溴氰菊酯的抗性倍数分别是6.55、4.16、43.27、0.70倍;到第30代时,分别是8.17、4.74、52.48、0.75倍;到39代时,对DDVP的抗性为10.37倍,对残杀威、氯氰菊酯的抗性分别为6.96倍、160.43倍。结论长期使用一种杀虫剂易产生抗性,亦对其他杀虫剂产生交互抗性,用药时应注意种类的选择。
Objective To investigate the resistance development and cross resistance of Culex pipiens pallens resistant to several chemical insecticides and provide the basis for rational use of insecticides. Methods The WHO standard bioassay method was used to calculate LC50, regression equation and resistance index. Results After 43 generations of breeding, anti-malaria resistance strain of 11.21 times. At 21 generations, the resistance multiples of Propoxur, DDVP, cypermethrin, trichlorfon, deltamethrin were 9.54,2.68,7.00,1.74,1.70 times respectively; by the 30th generation they were 11.34, 2.85, 8.07, 2.00 and 1.80 times. By the 39th generation, the resistance to Propoxur was 11.78 folds, and the resistance to DDVP and cypermethrin was 3.35 and 9.71 times, respectively. After 43 generations of selection, the resistance of DDVP strain reached 12.17 times, and the resistance multiples of DDVP, Propoxur, Cypermethrin and Deltamethrin were 6.55, 4.16, 43.27 and 0.70 times respectively at 21 generations; At the 30th generation, they were 8.17, 4.74, 52.48, and 0.75 times respectively. By the 39th generation, the resistance to DDVP was 10.37 times and their resistance to propoxur and cypermethrin was 6.96 and 160.43 times, respectively. Conclusion Long-term use of an insecticide is resistant to development and also has resistance to other insecticides. Care should be taken when choosing a drug.