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在温室内,试验观察了单独释放和组合释放东亚小花蝽Orius sauteri、丽蚜小蜂Encarsia formosa两种天敌对烟粉虱Bemisia tabaci的控制作用。结果显示:与不释放天敌的空白对照相比,单独释放东亚小花蝽处理对烟粉虱卵、若虫均有较好的控制效果;在释放后第1周,东亚小花蝽处理及东亚小花蝽和丽蚜小蜂组合处理与对照相比对烟粉虱卵和若虫的控制效果分别达到87.1%、89.3%和73.9%、78.3%,两周后的控制效果分别为72.7%、6.9%和64.8%、57.2%;而丽蚜小蜂的处理在释放天敌后第1周和第3周,对卵的控制效果分别为3.5%、80.3%,第3周对若虫的控制效果为75.7%。在相同数量天敌条件下,东亚小花蝽和丽蚜小蜂的组合处理较天敌单独处理对烟粉虱的控制效果好。
In the greenhouse, we observed the control effect of two natural enemies, Orius sauteri and Encarsia formosa, on Bemisia tabaci. The results showed that compared with the blank control without releasing natural enemies, the release of Trichosanthes simplex had better control effect on eggs and nymphs of B. tabaci. In the first week after the release, Compared with the control, the control effects on the eggs and nymphs of B. tabaci were 87.1%, 89.3%, 73.9% and 78.3%, respectively. The control effects after two weeks were 72.7%, 6.9% and 64.8% , And 57.2%, respectively. However, the control effect on eggs was 3.5% and 80.3% in the first week and the third week after the release of natural enemies, respectively. The control effect on nymphs in the third week was 75.7%. Under the same amount of natural enemies, the combination treatment of S. avenae and B. avenae was better than that of natural enemies to control B. tabaci.