6种杀虫剂对Q型烟粉虱的田间防治效果及抗性测定

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

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·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）。

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.