Immature guava fruits (Psidium guajava L.) of commercial orchards in Mexico are affected by adults of Conotrachelus dimidiatus (Champion) causing economic losses to producers. The aim of this study was to assess the behavioral and electrophysiological responses of the weevil to selected semiochemicals emitted by the host plant fruit and to conspecifics. Volatile organic compounds isolated from host plant as β-caryophyllene, (S)-(-)-limonene, hexanal, and nonanal significantly attracted adults of both sexes in behavioral bioassays. Electroantennogram recordings showed largest responses to papayanal and grandlure III + IV released by C. dimidiatus and C. nenuphar, respectively. Our results indicate that behavioral and electroantennographic assays using synthetic compounds from host plant volatiles and insect volatile pheromones produce olfactometry and electroantennographic responses in C. dimidiatus. This is the first report of intraspecific chemical communication in this weevil. We discuss the significance of these responses for the natural behavior in guava orchards and their potential use in a pest management strategy.

中文翻译：

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番石榴象鼻虫成虫的行为和触角电图反应，Conotrachelus dimidiatus（鞘翅目： Curculionidae）对合成宿主相关和同种挥发物的反应

墨西哥商业果园的未成熟番石榴果实 (Psidium guajava L.) 受到 Conotrachelus dimidiatus (Champion) 成虫的影响，给生产者造成经济损失。本研究的目的是评估象鼻虫对寄主植物果实和同种植物释放的选定化学信息素的行为和电生理反应。从宿主植物中分离出的挥发性有机化合物，如 β-石竹烯、(S)-(-)-柠檬烯、己醛和壬醛在行为生物测定中显着吸引了两性的成年人。触角电图记录显示对分别由 C. dimidiatus 和 C. nenuphar 释放的木瓜醛和大诱惑 III + IV 的反应最大。我们的结果表明，使用来自宿主植物挥发物和昆虫挥发性信息素的合成化合物进行的行为和触角电图测定在 C. dimidiatus 中产生嗅觉测量和触角电图反应。这是该象鼻虫种内化学通讯的第一份报告。我们讨论了这些反应对番石榴果园自然行为的重要性及其在害虫管理策略中的潜在用途。