6种杀虫剂对Q型烟粉虱的田间防治效果及抗性测定

本文测试了6种常用杀虫剂对黄瓜上Q型烟粉虱的田间防治效果，并进行室内毒力测定，以确定Q型烟粉虱对不同药剂的抗性。结果表明，施药后第3天，阿维菌素防治效果达78.8%，其次为苦参&;#8226;内酯，防效达65.1%，其他药剂防效低于45%；施药7d后，6种供试杀虫剂防效均下降到45%以下，且药剂间的差异不显著。毒力测定显示，Q型烟粉虱对6种常用杀虫剂均产生不同程度的抗性，且抗性水平高于B型。其中，Q型对高效氯氰菊酯抗性（抗性倍数47.69）显著高于B型（抗性倍数7.19）；对阿维菌素抗性则相对较低，抗性指数仅为4.40；对苦参碱、啶虫脒和吡虫啉的抗性居中（抗性倍数4.57~9.44）。

Control effects and toxicities of six insecticides against Bemisia tabaci Q biotype

Impacts of six common insecticides on Bemisia tabaci Q biotype in field efficiency trials and bioassays were tested with cucumber. The results showed that the corrected mortality of Q biotype whiteflies was 78.8% three days after abamectin was used. The corrected mortality by oxymatrine·prosuler was 65.1%, and the others were less than 45%. The mortality gradually decreased and had no significant differences between different insecticides tested after seven days. Compared with the B biotype whitefly, Q biotype developed higher resistance level to abamectin, matrine, acetamiprid, imidacloprid, oxymatrine·prosuler and cypermethrin. Attention should be paid to selecting appropriate pesticides to prevent Q Biotype whiteflies on cucumber. The six insecticides used at present induced different levels of resistance.