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目的 :调查我省城市致乏库蚊对常用杀虫剂的抗药性。方法 :区分剂量法和半数致死浓度法。结果 :区分剂量法结果显示 ,广州、深圳、佛山、江门、汕头、茂名、韶关等城市的致乏库蚊对马拉硫磷、溴氰菊酯、二氯苯醚菊酯都产生了抗性。半数致死浓度结果显示 ,上述城市中除江门外 ,其他城市的致乏库蚊对马拉硫磷的抗性指数都已超过 5倍 ,其中广州和深圳达到 15倍左右 ;对巴沙、残杀威的抗性指数上述城市均未超过 5倍 ;对溴氰菊酯的抗性指数均超过 5倍 ,其中广州最高为 5 4.8倍 ,其次是深圳和汕头为 36倍左右 ;对氯氰菊酯的抗性指数除茂名外均已超过 5倍 ;对二氯苯醚菊酯的抗性指数除江门外均已超过 5倍 ,最高的是深圳为 17.1倍 ;对EBT的抗性指数除广州外均未超过 5倍。结论 :我省蚊虫对拟除虫菊酯类杀虫剂特别是溴氰菊酯的抗性较高 ;为延缓抗性的发展 ,蚊虫的防制应轮换用药和使用复配杀虫剂。
Objective: To investigate the resistance of Culex pipiens pallens to common insecticides in our province. Methods: Dose-dose method and half-lethal concentration method. Results: Distinguishing dose method showed that Culex pipiens pallens in Guangzhou, Shenzhen, Foshan, Jiangmen, Shantou, Maoming and Shaoguan were resistant to malathion, deltamethrin and permethrin . The median lethal concentration showed that the resistance index of Culex pipiens pallens to malathion in other cities except Jiangmen was over 5 times, of which Guangzhou and Shenzhen reached about 15 times; The resistance index of these cities did not exceed 5 times; resistance index of deltamethrin more than 5 times, of which Guangzhou up to 5 4.8 times, followed by Shenzhen and Shantou for 36 times; resistance index of cypermethrin With the exception of Maoming both had more than 5 times; the resistance index of permethrin exceeded 5 times that of Jiangmen and the highest was 17.1 times of that of Shenzhen; the resistance index to EBT did not exceed 5 Times Conclusion: The mosquitoes in our province have higher resistance to pyrethroid insecticides, especially deltamethrin. To delay the development of resistance, mosquito control should be rotated and the compound pesticides should be used.