5种杀虫剂和黄瓜新小绥螨对棉田朱砂叶螨的协调防治

摘要

To find the method for the integrated control of carmine spider mite,Tetranychus cinnabarinus and de-lay its resistance to pesticides,the joint actions of each of five commonly pesticides (abamectin,azadirachtin,ma-trine,pyrethrins and imidacloprid),and Neoseiulus cucumeris (Oudemans),the natural enemy of cotton red spi-der mite were studied.N .cucumeris was released after application of pesticides for seven days (for 0.3% aza-dirachtin EC)or six days (for other pesticides).The results showed that the combined action of 1.8% abamectin EW (1∶8 000)and N .cucumeris had the best control efficacy of 96.63% at 20 days after N .cucumeris releasing. The control efficacies of N .cucumeris and 0.3% azadirachtin EC (1∶250)were 59.7% and 90.16% after one day and 20 days,respectively,after N .cucumeris releasing.The control efficacy of N .cucumeris and 0.5% matrine AS (1∶2 000)was 82.65% at 20 days after N .cucumeris releasing.The results provide options for sustainable con-trol of T .cinnabarinus and for the delay of pesticides resistance.%为协调使用杀虫剂及害虫天敌，本文测定了阿维菌素、印楝素、苦参碱、除虫菊素和吡虫啉5种常用杀虫剂分别与天敌黄瓜新小绥螨（原名胡瓜钝绥螨）对棉田朱砂叶螨的联合防治效果。结果表明：1．8％阿维菌素 EW （1∶8000）处理6 d 后释放黄瓜新小绥螨对朱砂叶螨的防治效果最佳，20 d 后相对防治效果高达96．63％；其次是0．3％印楝素 EC （1∶250）处理7 d 后释放黄瓜新小绥螨，1 d 和20 d 后防效分别为59．7％和90．16％；0．5％苦参碱 AS （1∶2000）处理6 d 后释放黄瓜新小绥螨，20 d 后相对防治效果达到82．65％。本研究为朱砂叶螨可持续防控提供了可选方案，为延缓抗药性产生提供了研究思路。