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烟蚜茧蜂是多寄主型天敌,本文究了烟蚜茧蜂对绿色型或红色型桃蚜与萝卜蚜共存系统中各种蚜虫的寄生选择性,分析了烟蚜茧蜂对桃蚜和萝卜蚜的寄生喜好性、选择性和转换行为等.实验中蚜虫总密度设置为60头,两种蚜虫的密度比例变化分别为1∶5,2∶4,3∶3,4∶2,5∶1.实验结果表明:共存系统中烟蚜茧蜂对桃蚜的寄生作用明显强于对萝卜蚜的寄生作用,烟蚜茧蜂选择寄生的蚜虫桃蚜,烟蚜茧蜂对桃蚜和萝卜蚜的寄生比例随各蚜虫密度的增加而增加,烟蚜茧蜂对红色型桃蚜与萝卜蚜组合的寄生作用高于对绿色型桃蚜与萝卜蚜组合的寄生作用.烟蚜茧蜂对桃蚜具有正喜好性和负转换行为;对萝卜蚜具有负喜好性和正转换行为.
The tobacco aphid Braconid parasitoid is a multi-host predator. In this paper, the parasitism of Aphidius brachygnathus against various aphids in the coexistence system of green or red aphid and radish aphid was studied. Aphids parasitism preferences, selectivity and conversion behavior.In the experiment, the total aphid density was set to 60, the two kinds of aphids density ratio changes were 1: 5,2: 4,3: 3,4: 2,5: 1. The experimental results show that the parasitism of A. calyciflorus to Myzus persicae in the co-existing system is obviously stronger than that of the A. solani in the coexistence system. The parasitism of the aphid Myzus persicae Of the parasitism increased with the increase of aphid density, the parasitism of the aphid parasitoids on the combination of the red-type Myzus persicae and the radish aphid was higher than that of the green-type Myzus persicae and the radish aphid. Has a positive preference and negative conversion behavior; on turnip aphids have negative preferences and positive conversion behavior.