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目的了解淡色库蚊对常用化学杀虫剂的交互抗性,为合理使用化学杀虫剂提供依据。方法采用WHO生物测定方法,检测淡色库蚊敏感品系和抗敌敌畏、抗残杀威、抗氯氰菊酯3种抗性品系IV龄幼虫分别对敌敌畏、残杀威和氯氰菊酯3种化学杀虫剂的抗性。结果淡色库蚊抗敌敌畏品系对敌敌畏、残杀威和氯氰菊酯3种化学杀虫剂的抗性系数分别为14.47、8.96和207.27,抗残杀威品系对上述3种杀虫剂的抗性系数分别为3.27、6.93和8.65,抗氯氰菊酯品系对3种杀虫剂的抗性系数分别为2.93、1.61和501.11。结论长期使用一种化学杀虫剂易产生抗性,并对其他化学杀虫剂产生不同程度的交互抗性。使用杀虫剂时应注意选择药物品种和剂量,以避免和延缓蚊虫抗药性的产生。
Objective To understand the interactive resistance of Culex pipiens pallens to common chemical insecticides and to provide a basis for rational use of chemical insecticides. Methods The WHO bioassay method was used to test the resistance of three susceptible strains of Culex pipiens pallens susceptible to dichlorvos, propoxur and cypermethrin to IV insecticides resistant to dichlorvos, propoxur and cypermethrin. Results The resistance coefficients of Culex pipiens pallens to dichlorvos, propoxur and cypermethrin were 14.47, 8.96 and 207.27, respectively. The resistance coefficients of anti-malachite to these three insecticides were 3.27 , 6.93 and 8.65 respectively. The resistance coefficients of cypermethrin to the three insecticides were 2.93, 1.61 and 501.11, respectively. CONCLUSIONS Long-term use of a chemical insecticide is susceptible to resistance and to varying degrees of cross-resistance to other chemical pesticides. When using pesticides should pay attention to select the drug species and dose, in order to avoid and delay the emergence of mosquito resistance.