Plants respond adaptively to herbivore stress in order to maintain fitness. Upon herbivore attack, plants emit blends of volatile organic compounds (VOCs) that differ from those that are constitutively emitted. These defense responses are typically specific to the identity of the attacking herbivore and often linked to the herbivore's feeding guild (e.g. chewing, phloem-feeding). Herbivores use plant volatiles to locate suitable host plants and changes in volatile emissions can affect host-plant location. Therefore, herbivores from separate feeding guilds can interact indirectly through the modulation of plant responses. In this study we tested how damage by an herbivore from one feeding guild affected the host-plant choice of an herbivore from a separate feeding guild, and vice versa. A chewing herbivore, the Colorado potato beetle (Leptinotarsa decemlineata), and a phloem feeding herbivore, the green peach aphid (Myzus persicae), were assayed in olfactometers to assess behavioral responses to odors emitted by potato plants (Solanum tuberosum) that were damaged by herbivores from the other feeding guild. Leptinotarsa decemlineata oriented more frequently towards undamaged plants compared to M. persicae damaged plants. Surprisingly, M. persicae preferred plants that were damaged by L. decemlineata, although previous studies had shown that they perform worse on these plants. Distinct differences were detected in the volatile profiles of herbivore-damaged and undamaged plants. Leptinotarsa decemlineata induced stronger volatile emissions compared to undamaged control plants, while M. persicae tended to suppress volatile emissions. These herbivores demonstrate contrasting induction of plant volatiles and behavioral responses. Exploring the nature of co-occurring herbivores and how they perceive potential hosts can play a significant role in understanding the ecological functions and community dynamics of plant plasticity and interactions with a variety of herbivores.

植物对草食动物的胁迫具有适应性，以保持健康。食草动物侵袭时，植物会散发挥发性有机化合物（VOC）的混合物，而挥发性有机化合物的构成与本构植物不同。这些防御反应通常特定于攻击性草食动物的身份，并且通常与草食动物的食行会（例如咀嚼，韧皮部食行）有关。草食动物利用植物挥发物来定位合适的寄主植物，挥发物排放的变化会影响寄主植物的位置。因此，来自不同饲养协会的食草动物可以通过调节植物的反应而间接相互作用。在这项研究中，我们测试了食草动物对一个进食行会的损害如何影响食草动物从另一个进食行会的寄主植物选择，反之亦然。在嗅觉仪中测定了咀嚼的草食动物，科罗拉多马铃薯甲虫（Leptinotarsa decemlineata）和韧皮部食草动物，绿色桃蚜（Myzus persicae），以评估对马铃薯植物（马铃薯）所散发的气味的行为响应，这些气味被马铃薯植物破坏了。来自其他饲养协会的食草动物。马铃薯甲虫相比，面向更频繁地向完好的植物蚜损坏植物。出人意料的是，波斯菊（M. persicae）首选被decemlineata损害的植物，尽管以前的研究表明它们在这些植物上的表现较差。在草食动物损坏和未损坏的植物的挥发性特征中检测到明显的差异。与未受损的对照植物相比，小扁豆（Leptinotarsa decemlineata）诱导了更强的挥发性排放，而百日草（M. persicae）倾向于抑制挥发性排放。这些草食动物表现出不同的植物挥发物诱导和行为反应。探索共生食草动物的性质及其对潜在寄主的认识，可以在理解植物可塑性的生态功能和群落动态以及与各种食草动物的相互作用中发挥重要作用。