Effects of volatile infochemicals (SOS signals) emitted from plants infested with the diamondback moth (Plutella xylostella) on the American serpentine leafminer (Liriomyza trifolii)

虽然许多研究都集中在吸引天敌的挥发性SOS信号发出的植物与害虫食草动物，相对知之甚少的SOS信号对其他害虫物种的影响。因此，我们研究了美洲斑潜蝇（Liriomyza trifolii）在十字花科植物（如白菜）中的觅食和产卵行为，其寄主，小菜蛾（Plutella xylostella），一种重要的十字花科植物的害虫。我们发现，叶斑潜蝇女性避免挥发性SOS信号发出的十字花科植物的P.xylostella感染，因此，他们不吃和产卵在受感染的植物。我们还发现，由草食动物诱导的十字花科植物的直接防御系统可以大大降低在植物的叶子内取食的潜叶蝇幼虫的存活率，这可能部分解释了为什么潜叶蝇女性避免SOS信号从十字花科植物与其他草食动物的侵扰。

Although many studies have focused on attraction of natural enemies to volatile SOS signals emitted from plants infested with pest herbivores, relatively little is known about the influence of SOS signals on other pest species. Thus, we investigated foraging and oviposition behavior of the American serpentine leafminer (Liriomyza trifolii) in the cruciferous plants (e.g. Brassica rapa) infested with larvae of their host, the diamond back moth (Plutella xylostella), an important pest of cruciferous plants. We found that leafminer females avoided volatile SOS signals emitted from P. xylostella-infested cruciferous plants and thus they refrained from eating and oviposting in the infested plants. We also found that direct defense systems of cruciferous plants induced by herbivory can drastically decrease the survival ratio of leafminer larvae feeding inside the leaves of the plants, which may partly explain why leafminer females avoid SOS signals from cruciferous plants infested with other herbovores.