不同类型生物杀虫剂对烟草斜纹夜蛾室内药效试验

摘要

The efficacy trials of several types of biological insecticides against 3th instar larvae of P. litura were carried out in laboratory by using flooding method. The results of insecticide application showed that the insect death rates of Beauveria bassiana ( dilution 1:250 ) and polyhedrons virus (dilution 1:250) were up to 100% after 1 day application, their control effects were better than that of avermectin( dilution 1:5000) and apinosad(dilution 1 : 5000), which the adjusted death rates reached over 90% after 3 days and at 100 % after 4 days application. However, the remaining treatments of meliae toosendan(dilution 1:100) , matine(dilution 1:600) and Bacillus thuringiensis(dilution 1:250) performed worst, which had low adjusted death rates at 67.2 %, 59.0 % and 66.7% respectively after 8 days application. Overall, the control efficacy in lab of Beauveria bassiana, polyhedrosis virus, avermectin and apinosad was superior to usually used chemical insecticide, cypermethrin.%文章采用浸液法测定了几种生物杀虫剂对烟草斜纹夜蛾3龄幼虫的室内杀虫效果.结果表明,微生物源杀虫剂白僵菌250倍液和斜纹夜蛾多角体病毒250倍液杀虫效果最好,施药第1天后害虫死亡率就达100％.抗生素类杀虫剂阿维菌素5000倍液和多杀霉素5000倍液次之,在药试第3天校正死亡率在90％以上,第4天均达100％.植物源杀虫剂苦楝素100倍液、苦参碱600倍液和微生物源杀虫剂苏云金杆菌250倍液室内杀虫效果较差,在药试第8d校正死亡率仅为67.2％、59.0％和66.7％.白僵菌、料纹夜蛾多角体病毒、阿维菌素和多杀霉素室内杀虫效果均优于常规化学杀虫剂氯氰菊酯.