Department of Plant Protection, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt.
J Chem Ecol. 2011 Mar;37(3):267-72. doi: 10.1007/s10886-011-9915-6. Epub 2011 Feb 18.
Females of the gregarious endoparasitoid Cotesia kariyai were attracted to a blend of volatiles released from corn plants infested with larvae of their host, the common armyworm (Mythimna separata). We investigated the effects of time after the last infestation (1-168 h) on the attractiveness of corn plants infested by host larvae by using a wind tunnel under laboratory conditions. Immediately after the removal of the larvae, parasitoids were attracted more to plants that had been infested with the larvae than to intact plants (control). This attractiveness gradually decreased with time after the last infestation. The attractiveness of the infested plants was significantly higher than that of intact plants when the time after the last infestation was within 1 day. Fifteen herbivore-induced volatiles were recorded in the headspace of infested corn plants irrespective of time. The amounts of some compounds including (Z)-3-hexen-1-yl acetate, which have already been reported to attract C. kariyai, correlated with the attractiveness. The ecological meaning of the duration of production of C. kariyai attractants is discussed.
群居内寄生蜂卡里亚实蝇（Cotesia kariyai）雌性个体被玉米植株受其宿主幼虫（粘虫，Mythimna separata）侵害后释放的挥发性混合物所吸引。我们在实验室条件下使用风洞，研究了在最后一次侵害后（1-168 小时），受侵害玉米植株对宿主幼虫的吸引力的时间效应。在幼虫被移除后，立即吸引寄生蜂的是受幼虫侵害的植物，而不是未受侵害的植物（对照）。这种吸引力随着最后一次侵害后的时间的延长而逐渐减弱。当最后一次侵害后的时间在 1 天内时，受侵害植物的吸引力明显高于未受侵害的植物。在受侵害玉米植株的头空间中，无论时间如何，都记录到了 15 种取食诱导挥发物。包括（Z）-3-己烯-1-基乙酸酯在内的一些化合物的含量与吸引力有关，而这些化合物已经被报道可以吸引卡里亚实蝇。讨论了卡里亚实蝇引诱剂产生的持续时间的生态意义。
