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目的了解北京市丰台区德国小蠊对高效氯氰菊酯、乙酰甲胺磷、溴氰菊酯、残杀威、毒死蜱的抗药性及其抗性衰退情况。方法采用WHO推荐的药膜法,测定经实验室饲养1代和正常饲养1年后的试虫对常用杀虫剂的半数击倒时间(KT50)及其95%置信区间(95%CI)、击倒率、死亡率,评价其抗药性程度及抗性衰退情况。结果德国小蠊现场种群对高效氯氰菊酯、乙酰甲胺磷、溴氰菊酯、残杀威和毒死蜱的抗性倍数分别为7.91、1.90、30.52、4.56和2.06倍;饲养1年后,其抗性消退率分别为42.82%、49.70%、74.77%、56.51%和-24.19%。结论丰台区德国小蠊现场种群对5种常用杀虫剂均产生不同程度的抗性;饲养1年后,除毒死蜱外,对其他杀虫剂的抗性均有所消退,抗性消退率均达40%以上。
Objective To understand the resistance and resistance decline of Blattella germanica in Fengtai District of Beijing to beta-cypermethrin, acephate, deltamethrin, propoxur and chlorpyrifos. Methods The half-knock-down time (KT50) and 95% confidence interval (95% CI) of commonly used insecticides on pest insects after one-year rearing in the laboratory and one year after normal feeding were determined by WHO method. Knockdown rate, mortality rate, evaluate the degree of resistance and resistance decline. Results The resistance of German cockroach population to beta-cypermethrin, acephate, deltamethrin, propoxur and chlorpyrifos was 7.91, 1.90, 30.52, 4.56 and 2.06 times, respectively. Rates were 42.82%, 49.70%, 74.77%, 56.51% and -24.19% respectively. Conclusion The live population of Blattella germanica in Fengtai district had different degrees of resistance to five commonly used insecticides. After one year of feeding, except for chlorpyrifos, the resistance to other insecticides subsided, and the rate of resistance regression More than 40%.