欧洲山芥对小菜蛾个体发育及产卵选择性的影响

Effects of Barbarea vulgaris on the development and oviposition preference of Plutella xylostella

测试了欧洲山芥对小菜蛾个体发育和成虫繁殖力的影响,以及小菜蛾雌蛾经历不同植物后对其产卵选择性的影响。结果表明,在欧洲山芥开花结籽期植株上取食发育至化蛹的少量个体,与白菜、结球甘蓝上取食发育的个体相比,身体较小,繁殖力较低;欧洲山芥具有刺激小菜蛾成虫增加生殖力的作用,对甘蓝上发育出来的雌成虫,当分别提供欧洲山芥或结球甘蓝让其产卵时,在两种植物上平均每雌产卵量分别为267粒和139粒;经历不能明显改变小菜蛾雌成虫对欧洲山芥的强烈嗜好性,当小菜蛾在成虫期经历白菜或甘蓝后,对这两种植物的相对嗜好性虽有所提高,但仍将绝大部分或所有的卵产在欧洲山芥上。可见,欧洲山芥对于小菜蛾是一种较为理想的诱杀植物。

Experiments were conducted to examine the effect of Barbarea vulgaris on the development and reproduction of the diamondback moth, Plutella xylostella, as well as the effect of experiencing various plants by female adults on their subsequent oviposition preference. A small proportion of diamondback moth larvae could feed and survive to pupation on flowering plants of B. vulgaris. Compared to individuals reared from Chinese cabbage and common cabbage, pupae and adults reared from flowering plants of B. vulgaris were smaller and showed a lower fecundity. However, when adults reared from common cabbage were provided rosette plants of B. vulgaris or common cabbage for oviposition, the average lifetime fecundity was 267 and 139 on the two species of plants respectively, indicating that B. vulgaris stimulated the moths to increase their fecundity. When female adults were offered experience of leaves of Chinese cabbage or common cabbage, their preference for these two plants were somewhat increased, but they still deposited most or all of their eggs on B. vulgaris, suggesting that the strong preference for B. vulgaris by the diamondback moth was not substantially altered by prior experience. These results showed that B. vulgaris is a relatively ideal dead-end trap plant for the manazement of diamondhack moth.