【摘要】 研究了半闭弯尾姬蜂对白菜和甘蓝上寄主的选择性 ,以及白菜和甘蓝经不同处理所产生的挥发物对该蜂寄主选择的作用。结果表明 :当白菜和甘蓝上小菜蛾幼虫密度相等时 ,半闭弯尾姬蜂对白菜上小菜蛾幼虫的寄生数明显高于甘蓝 ;在对挥发物的行为反应观察中 ,半闭弯尾姬蜂对白菜 小菜蛾复合体的选择性大于甘蓝 小菜蛾复合体 ,对被小菜蛾损伤的白菜植株的选择性也大于被小菜蛾损伤的甘蓝植株 ;而该蜂对两种蔬菜的完整植株或机械损伤植株之间则无明显的选择性。更多还原

【Abstract】 The host selection of Diadegma semiclausum between plants of two Brassica species and the effect of plant volatiles on the host selection behavior of D. semiclausum were studied in the lab. When D. semiclausum wasps were provided with equal numbers of larvae of Plutella xylostella on Chinese cabbage (Brassica campestris ssp. pekinensis) and common cabbage (Brassica oleracea var. capitata), the number of hosts parasitized on Chinese cabbage was higher than that on common cabbage. In bioassays with volatiles, D. semiclausum wasps showed preference for the Chinese cabbage with P. xylostella larvae over the common cabbage with P. xylostella larvae, the wasps also showed preference for Chinese cabbage plants previously infested by P. xylostella larvae over the common cabbage plants previously infested by P. xylostella larvae. However, the wasps showed no preference between the two plant species when the plants were intact or artificially damaged.更多还原