豆柄瘤蚜茧峰的嗅觉定向反应(英文)

豆柄瘤蚜茧蜂Lysiphlebusfabarum对能寄生于包括大豆蚜Aphisglycines和豆蚜A.craccivora的多种蚜虫中。本实验研究了豆柄瘤蚜茧蜂在风洞中对以下气味源的嗅觉走向反应：未受损伤的寄主食料植株（UD）、机械损伤的寄主食料植株（MD）、蚜害植株（AD ，带蚜虫；AD～，不带蚜虫）、以及致害蚜虫。发现以豆蚜为寄主的豆柄瘤好茧蜂对AD 和AD~的正走向率高于对UD和MD的正走向率，以大豆蚜为寄主的豆柄瘤蚜虽峰对AD 的趋性高于对UD和大豆蚜。同时，豆柄瘤蚜茧蜂对UD、MD和致害蚜虫的定向反应率没有显著差异。这说明植食性昆虫的取食活动能诱导被害植株提高自身对害虫天敌的吸引力。此外还发现大豆是否受蚜害并不直接影响大豆蚜进行寄主定位。

OLFACTORY ORIENTATION OF THE PARASITOID WASP LYSIPHLEBUS FABARUM TO ITS HOST FOOD PLANTS

Lysiphlebus fabarum (Hymenoptera: Aphidiidae) is a generalist parasitic wasp species which can oviposit in several aphid species, including the bean aphid, Aphis craccivora (Homoptera Aphidinae), and the soybean aphid, A. glycines. The response of female L. fabarum and one of its host aphid species, A. glycines, to odors of undamaged host food plant (UD), mechanically damaged host food plant (MD), aphid-damaged plant (AD , with aphid on, and AD~, aphid washed off),and host aphid alone were studied in a wind tunnel. The positive orientation frequency of L.fabarum, which emerged from Aphis craccivora, to AD and AD~ was significantly greater than to the UD, MD. Similarily, L. fabarum that emerged from A. glycines significantly flew more often to AD than to UD and aphid alone. And there was no significant difference among the positive response frequency of L. fabarum to UD, MD, and aphid alone. All these suggested that herbivorefeeding induced the attraction of the damaged plant to natural enemy of herbivore. It is also found that the condition of soybean seedling, being damaged or undamaged, did not have direct impact onhost plant location of aphid.