烟蚜茧蜂和菜蚜茧蜂对烟蚜的复合控制效果

Combined Control Effect of Aphidius gifuensis and Diaeretiella rapae on Myzus persicae

大棚释放不同比例的烟蚜茧蜂和菜蚜茧蜂（4∶0、3∶1、2∶2、1∶3、0∶4）,防治不同数量烟蚜种群（蚜情指数为0-5级。结果表明：蚜情指数为0-3级时,烟蚜茧蜂和菜蚜茧蜂以3：1的比例释放可以达到更好的控制烟蚜的效果,防治效果达81.13%。蚜情指数达到4-5级时,烟蚜茧蜂和菜蚜茧蜂以1：1的比例释放时,控制效果高于比其他对照组,但不能及时有效的控制烟蚜种群的增长。

Different proportions of Aphidius gifuensis and Diaeretiella rapae（4∶ 0,3∶ 1,2∶ 2,1∶ 3,0∶ 4） were released in plastic greenhouse to control Myzus persicae（sulzer） population with aphid index from 0 - 5. The results showed that release of A. gifuensis and D. rapae in a ratio of 3∶ 1 had better control effect when the index of aphid number was between Grade 0 and Grade 3,of which the control effect was as high as 81. 13%.While the index of aphid number was from Grade 4-5,the proportion of A. gifuensis and D. rapae which was set as 1 ∶ 1 got better control efficiency than other treatments,but the increase of the aphid population could not be inhibited effectively under this condition.