寄主植物对小菜蛾产卵选择性及菜蛾绒茧蜂寄主选择行为的影响

测试了小菜蛾成虫对甘蓝和白菜的产卵选择性及菜蛾绒茧蜂对这两种蔬菜上寄主的寄生选择性。结果表明，当甘蓝和白菜同时存在时，小菜蛾在白菜上的产卵量约为甘蓝上的3倍。菜蛾绒茧蜂的寄主选择性试验表明，当两种蔬菜上寄主密度相同时，该蜂对白菜上小菜蛾幼虫的寄生数量接近甘蓝上的5倍。最后，对小菜蛾产卵选择性及菜蛾绒茧蜂的寄主选择行为与寄主植物的关系进行了讨论。

Effects of host plant on the oviposition preference of Plutella xylostella ( L.) and host- selection behavior of Cotesia plutellae (Kurdjmov).

The ovipositional preference of the diamondback moth, Plutella xylostella (L.) between different Brassica vegetable plants and the host selection by Cotesia plutellae (Kurdjmov) between host larvae on different Brassica plants were studied. With the presence of both the Chinese cabbage, B. campestris L. ssp. pekinensis, the common cabbage, Brassica oleracea L. var. capitata, P. xylostella, moths laid three times as many eggs on the former as that on the latter plants. When C. plutellae wasps were provided with equal numbers of larvae of P. xylostella on both species of plants in one area, parasitism rate of hosts on B. campestris was almost five times that on B. oleracea. The possible effects of infochemicals from the Brassica plants on the oviposition preference of P. xylostella and on the host selection by C. plutellae were discussed.