Chemistry Research Unit, Center for Medical, Agricultural and Veterinary Entomology, U.S. Department of Agriculture-Agricultural Research Service, 1700 SW 23rd Drive, Gainesville, FL, 32608, USA.
J Chem Ecol. 2021 Sep;47(8-9):799-809. doi: 10.1007/s10886-021-01302-w. Epub 2021 Aug 4.
Fall armyworm (Spodoptera frugiperda) is a major global pest of many crops, including maize (Zea mays). This insect is known to use host plant-derived volatile organic compounds to locate suitable hosts during both its adult and larval stages, yet the function of individual compounds remains mostly enigmatic. In this study, we use a combination of volatile profiling, electrophysiological assays, pair-wise choice behavioral assays, and chemical supplementation treatments to identify and assess specific compounds from maize that influence S. frugiperda host location. Our findings reveal that methyl salicylate and (E)-alpha-bergamotene are oviposition attractants for adult moths but do not impact larval behavior. While geranyl acetate can act as an oviposition attractant or repellent depending on the host volatile context and (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT) is an oviposition deterrent. These compounds can also be attractive to the larvae when applied to specific maize inbreds. These data show that S. frugiperda uses different plant volatile cues for host location in its adult and larval stage and that the background volatile context that specific volatiles are perceived in, alters their impact as behavioral cues.
秋黏虫（Spodoptera frugiperda）是许多作物的主要全球性害虫，包括玉米（Zea mays）。已知这种昆虫在成虫和幼虫阶段都会利用宿主植物衍生的挥发性有机化合物来定位合适的宿主，但单个化合物的功能仍然大多是神秘的。在这项研究中，我们使用挥发性成分分析、电生理测定、两两选择行为测定和化学补充处理相结合的方法，来识别和评估玉米中影响 S. frugiperda 宿主定位的特定化合物。我们的研究结果表明，水杨酸甲酯和（E）-α-佛手柑烯是成虫的产卵引诱剂，但不影响幼虫的行为。乙酸香叶酯可以根据宿主挥发性成分的变化而作为产卵引诱剂或驱避剂，而（E）-4,8-二甲基-1,3,7-壬三烯（DMNT）则是产卵抑制剂。这些化合物在应用于特定的玉米自交系时也可能对幼虫有吸引力。这些数据表明，S. frugiperda 在成虫和幼虫阶段利用不同的植物挥发性线索来定位宿主，而特定挥发性物质在背景挥发性环境中被感知的方式会改变它们作为行为线索的影响。
