Desurmont Gaylord A, Morelon Stéphanie P G, Benrey Betty
Laboratoire d'entomologie évolutive, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland.
European Biological Control Laboratory (EBCL USDA ARS), Campus International de Baillarguet, Montferrier-sur-lez, France.
Environ Entomol. 2020 Apr 14;49(2):364-369. doi: 10.1093/ee/nvaa007.
The viburnum leaf beetle (VLB), Pyrrhalta viburni (Paykull), is an invasive chrysomelid in North America where it infests native Viburnum shrubs in woody areas and managed landscapes. Despite its invasive and destructive nature, little is known about the chemical ecology of this beetle, and efficient chemical lures for monitoring and trapping this insect have yet to be developed. Using two of the main host plants of VLB in its native range, Viburnum opulus L. (Caprifoliaceae) and V. lantana L., we examined the olfactory preferences of adult females of VLB under laboratory conditions and measured volatile emissions of Viburnum twigs with and without VLB damage. VLB females had a clear preference for V. opulus and V. lantana twigs compared to blank odor sources. In addition, twigs with foliar damage and fresh egg masses were found to be more attractive than noninfested twigs in V. opulus when VLB infestation was recent, but not when twigs had been infested for several weeks. Chemical analyses revealed consistent treatment-specific blends of compounds, which may be used for the elaboration of attractive lures. Future research should focus on the identification of these compounds and on exploring the olfactory preferences of VLB with Viburnum species present in North America.
荚蒾叶甲（VLB），即Pyrrhalta viburni（Paykull），是北美洲的一种入侵性叶甲，它在林区和人工管理景观中侵害本地的荚蒾属灌木。尽管其具有入侵性和破坏性，但对这种甲虫的化学生态学却知之甚少，且尚未开发出用于监测和诱捕这种昆虫的有效化学引诱剂。我们利用荚蒾叶甲在其原生范围内的两种主要寄主植物，即欧洲荚蒾（忍冬科）和香荚蒾，在实验室条件下研究了荚蒾叶甲成年雌虫的嗅觉偏好，并测量了有和没有荚蒾叶甲侵害的荚蒾嫩枝的挥发性物质排放。与空白气味源相比，荚蒾叶甲雌虫对欧洲荚蒾和香荚蒾嫩枝有明显偏好。此外，当荚蒾叶甲近期侵害时，有叶片损伤和新鲜卵块的嫩枝在欧洲荚蒾中比未受侵害的嫩枝更具吸引力，但当嫩枝被侵害数周后则不然。化学分析揭示了特定处理的化合物一致混合物，这可用于制作有吸引力的引诱剂。未来的研究应集中于鉴定这些化合物，并探索荚蒾叶甲对北美洲现存荚蒾属物种的嗅觉偏好。
