烟蚜茧蜂对桃蚜和萝卜蚜的寄生选择性
The Parasitic Selectivity of Aphidius gi f uensis to Myzus persicae and Lipaphis erysimi
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摘要: 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．Abstract: A phidius gifuensis is an important parasitoid to some aphids .In this research ,the parasitic selectivity of A. gifuensis to Myzus persicae and Lipaphis erysimi was studied ,in which the parasitic situation ,selectivi‐ty ,preference and switching behavior of the parasitoids were analyzed .The total sampling size was 60 a‐phids and the ratios of M. persicae individuals to L. erysimi individuals were 1∶5 ,2∶4 ,3∶3 ,4∶2 or 5∶1 .The test result showed that A. gif uensis had more oviposition in M. persicae than in L. erysimi , and that the parasitic ratio of A. gif uensis to M. persicae or L. erysimi was positively correlated with the aphid density ,and the total parasitic function of A. gi f uensis to M. persicae and L. erysimi group was higher .A. gif uensis showed a positive preference to M. persicae and a negative preference to L. ery‐simi .and a negative switching to M. persicae and a positive switching to L. erysimi .
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