论文部分内容阅读
目的了解咸宁市优势蚊种致倦库蚊的种群密度、分布、季节消长动态和对3种常用杀虫剂的抗性情况,为指导城区灭蚊工作提供科学依据。方法致倦库蚊种群动态监测采用诱蚊灯法,抗药性监测采用WHO推荐的幼虫浸渍法,测定溴氰菊酯、DDT和双硫磷对致倦库蚊Ⅳ龄幼虫的半数致死浓度LC50。结果致倦库蚊种群动态消长有明显的季节性,在7—9月份密度最高,呈现单峰曲线。牲畜棚的蚊密度最高,2013—2015年平均蚊密度分别为0.07、0.1和0.18只/(灯·h);抗药性监测数据显示,溴氰菊酯、DDT和双硫磷对致倦库蚊的LC50分别为0.011 05、0.375 10和0.000 81 mg/L,致倦库蚊对3种杀虫剂产生的抗性倍数分别为11.050、31.260和1.353倍。结论咸宁市城区优势种致倦库蚊的发生高峰期为7—9月份,是防治蚊虫的关键时期,建议结合治理蚊虫孳生地控制蚊密度,延缓抗药性发展。
Objective To understand the population density, distribution, seasonal dynamics and dynamics of Culex pipiens quinquefasciatus in Xianning city, and provide a scientific basis for the anti-mosquito work in urban areas. Methods The mosquito population dynamics of Culex pipiens pallens were monitored by the method of mosquito lamp and resistance monitoring. The LC50 of deltamethrin, DDT and diphosphorus to the fourth-instar larvae of Culex quinquefasciatus was determined by larvae immersion method recommended by the WHO. Results The population dynamics of Culex pipiens quinquefasciatus was obviously seasonal, with the highest density in July-September and a unimodal curve. The mosquito density of livestock shed was the highest, and the average mosquito density was 0.07, 0.1 and 0.18 / (lamp · h) respectively from 2013 to 2015. The resistance monitoring data showed that deltamethrin, DDT and diphtheria The LC50 of the three pesticides were 0.011 05, 0.375 10 and 0.000 81 mg / L, respectively. The resistance multiples of Culex pipiens pallens to the three insecticides were 11.050, 31.260 and 1.353 times, respectively. Conclusion The peak period of Culex pipiens quinquefasciatus in urban area of Xianning city is from July to September, which is the key period for mosquito control. It is suggested that mosquito density should be controlled in combination with mosquito breeding sites and the development of drug resistance should be delayed.