Insect Attractants, Behavior, and Basic Biology Research Laboratory, USDA, 32604, Gainesville, Florida.
J Chem Ecol. 1984 Mar;10(3):521-9. doi: 10.1007/BF00988097.
Potential kairomone sources of the fall armyworm (FAW),Spodoptera frugiperda (J.E. Smith), were bioassayed with females ofCotesia marginiventris (Cresson) in Petri dishes (10 cm diam). MatedC. marginiventris females, ranging in age from 1 to 3 days exhibited the most intense bioassay responses to potential sources of kairomone. Contacting a FAW-damaged corn leaf modified the pattern of movement inC. marginiventris from random to one exhibiting a significant increase in klinokinesis. No significant differences were present in kairomone responses of nonconditioned and conditioned parasitoids and parasitoid response to kairomones did not change throughout the photophase (0800-1800 hr). Removal of one, both, or the first eight antennal segments reduced or eliminated the response of the parasitoid to kairomones. Female parasitoids did not exhibit a preference for corn leaves damaged by a particular fall armyworm instar and parasitization rates were highest in larvae 48 hr old.
用玉米叶片饲养的草地贪夜蛾（Spodoptera frugiperda）幼虫（1-3 龄）对野外寄生蜂（Cotesia marginiventris）雌蜂具有最强的引诱作用。接触到被草地贪夜蛾取食过的玉米叶片后，C. marginiventris 的移动模式从随机变为向性运动，表现出明显的趋化性增强。未受处理和受过处理的寄生蜂对引诱源的反应没有显著差异，并且在整个光照期（0800-1800 小时）内，寄生蜂对引诱源的反应没有变化。切除一只、两只或前 8 个触角节段会降低或消除寄生蜂对引诱源的反应。雌寄生蜂对特定龄期的草地贪夜蛾取食叶片没有偏好，48 小时龄的幼虫寄生率最高。
