4种杀虫剂对淡色库蚊幼虫的药效对比试验

Comparative experiment study of the efficacy of four kinds of insecticides against mosquito larvae

目的探讨4种杀虫剂对淡色库蚊幼虫的致死效果,并对各杀虫剂的持效期进行评价。方法室内测定4种杀虫剂对蚊幼虫的致死活性,同时进行人工现场试验,测定4种杀虫剂持效时间。结果双硫磷和吡虫啉对蚊幼虫有较好的致死活性,其中双硫磷的持效时间在21～28d,吡虫啉的持效时间在14～21d;醚菊酯的防效最差,35d蚊幼虫的平均死亡率仅为21.8%,羽化率却高达66.7%;吡丙醚致死活性虽不高,但可有效防止蚊幼虫羽化,且持效期可达35d以上。结论综合施药人工成本及防治效果因素考虑,吡丙醚是4种杀虫剂中杀蚊幼虫的最佳选择。

Objective To evaluate the lethal efficacy and effective duration of insecticides against Culex pipiens pallens larvae.Methods The control efficacies of the four insecticides against mosquito larvae were measured under laboratory settings and the duration tested in an artificial field.Results Temephos and Imidacloprid had good killing effects on the mosquito larvae.The efficiency of Temephos lasted 21-28 days,while that of Imidacloprid lasted 14-21 days.Ethofenprox demonstrated the worst effect.The mortality for mosquito larvae was 21.8% by day 35.Despite a low death activity,Pyriproxyfen effectively prevented the eclosion of mosquito larvae,the action of which lasted for more than 35 days.Conclusion In terms of both the labor costs and control efficacy,Pyriproxyfen is the optimal option among the four insecticides.