Eucryptorrhynchus scrobiculatus and E. brandti (Coleoptera: Curculionidae) are host-specific pests of Ailanthus altissima (Mill.) Swingle (Sapindales: Simaroubaceae), causing extensive damage to the host. There are no effective attractants available for pest management. The main aim of this study was to explore the role of host plant-derived volatiles in the behavioral response of both weevil species. In a field experiment, both weevil species showed positive response to phloem, and there was no preference for phloem associated with healthy or injured trees. Significantly more E. brandti adults responded to the olfactory treatments compared to E. scrobiculatus. In a large-arena experiment, both males and females of E. scrobiculatus significantly preferred phloem from the tree trunk while adults of E. brandti responded in significantly greater numbers to tree limbs than to any other parts of host. Females and males of E. scrobiculatus responded positively to all parts of host tested in the Y-tube bioassay, while E. brandti adults were only attracted by the phloem from healthy and injured trees. There were dissimilar electroantennographic responses to compounds such as 1-hexanol and (1S)-(−)-β-pinene between the two weevil species. This study represents the first report documenting behavioral and electrophysiological responses of E. scrobiculatus and E. brandti to volatiles from various parts of A. altissima and findings may aid efforts to develop attractants.

中文翻译：

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Eucryptorrhynchus scrobiculatus和E.brandti（鞘翅目：Curculionidae）对天上树臭椿（Ailanthus altissima）发出的挥发物的行为和电生理反应的对比

沟眶scrobiculatus和E.田鼠（鞘翅目：象甲科）是主机特定害虫臭椿（密尔）欢乐之（无患子目：苦木科），导致对宿主的破坏。没有有效的引诱剂可用于有害生物管理。这项研究的主要目的是探讨寄主植物挥发物在两种象鼻虫的行为反应中的作用。在田间实验中，两种象鼻虫对韧皮部均表现出阳性反应，并且没有选择与健康或受伤树木相关的韧皮部。与scrobiculatus相比，白兰地成年人对嗅觉疗法的反应明显多。在大区域实验中，男性和女性scrobiculatus明显偏爱树干中的韧皮部，而brandti的成年人对肢体的反应明显多于对寄主的任何其他部分。S. crobiculatus的雌性和雄性对通过Y型管生物测定法测试的寄主的所有部位均呈阳性反应，而Brandti的成虫只被韧皮部吸引，来自健康和受伤的树木。在两种象鼻虫物种之间，对诸如1-己醇和（1 S）-（-）- β- pine烯的化合物存在不同的电刺激响应。这项研究代表了第一份报告E. scrobiculatus和E. brandti的行为和电生理反应的报告可以发现来自A. altissima各个部位的挥发物，发现可能有助于开发引诱剂。