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目的了解江西省部分地区致倦库蚊对高效氯氰菊酯、胺菊酯、溴氰菊酯3种拟除虫菊酯抗药性,为指导蚊虫控制工作提供科学依据。方法采用浸渍法测定致倦库蚊幼虫半数致死浓度(LC50)。结果相较于2014年,抚州市、九江市、新余市3地市致倦库蚊对高效氯氰菊酯的抗性倍率分别上升21.06、3.78和6.98倍;对胺菊酯抗性倍率上升6.8、0.63和3倍;对溴氰菊酯的抗性倍率分别上升7.67、4.87和5.34倍。除此之外,新增加的上饶、吉安2个监测点中致倦库蚊对3种拟除虫菊酯均表现中高抗药性。结论除科学合理地使用杀虫剂交替轮用外,还应重点开展城市的环境治理,通过综合性的防治措施,延缓致倦库蚊抗药性的发展。
Objective To understand the resistance of three species of pyrethrins to cypermethrin, tetramethrin and deltamethrin to Culex pipiens quinquefasciatus in some areas of Jiangxi Province, and to provide a scientific basis for guiding mosquito control. Methods The half maximal lethal concentration (LC50) of Culex pipiens pallens larvae was determined by immersion method. Results Compared with 2014, the resistance rates of Culex pipiens quinquefasciatus to beta-cypermethrin in Fuzhou, Jiujiang and Xinyu cities were increased by 21.06, 3.78 and 6.98 times respectively; the resistance rates to tetramethrin increased by 6.8 and 0.63 and 3 times. The resistance rate to deltamethrin increased 7.67, 4.87 and 5.34 times respectively. In addition, the newly added Culex pipiens quinquefasciatus in two monitoring sites in Shangrao and Ji’an showed high resistance to all three pyrethroids. Conclusion In addition to the scientific and rational use of pesticides on an alternate basis, we should also focus on urban environmental governance and delay the development of Culex pipiens quinquefasciatus through comprehensive prevention and control measures.