Foraging wireworms are attracted to root-produced volatile aldehydes

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• 作者：Fanny Barsics ; Benjamin M. Delory ; Pierre Delaplace…
• 关键词：Coleoptera ; Elateridae ; Agriotes ; Integrated pest management ; Volatile compounds ; Chemical ecology ; Dynamic head ; space sampling
• 刊名：Journal of Pest Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：90
• 期：1
• 页码：69-76
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Entomology; Agriculture; Plant Pathology; Ecology; Forestry; Plant Sciences;
• 出版者：Springer Berlin Heidelberg
• ISSN：1612-4766
• 卷排序：90

文摘

Soil-dwelling insects are known to react to chemical cues they encounter in the rhizosphere. Whether wireworms (Coleoptera, Elateridae) use root-emitted volatile organic chemicals to localize their host plant remains, however, poorly understood. Here, we aimed at identifying chemical cues released by barley roots that attract Agriotes sordidus. In a first behavioral experiment, we assessed the ability of wireworms to orient towards live barley roots, using dual-choice olfactometers suitable for belowground insects. Then, we collected the volatile organic compounds (VOC) produced by barley roots using a dynamic head-space sampling approach. VOC were quantified and identified using gas chromatography—mass spectrometry (GC–MS). The odorant blend is composed of four aldehydes, namely hexanal, (E)-hex-2-enal, (E)-non-2-enal, and (E,Z)-nona-2,6-dienal. In a second set of dual-choice bioassays, wireworms were attracted towards a synthetic blend of these four major compounds. However, the synthetic blend was not as attractive as live roots, which is partially explained by the absence of CO₂, commonly known as a strong attractant for soil-dwelling insects. While CO₂ indicates the presence of living material in the vicinity, we hypothesize that additional VOC inform about the plant suitability. A better understanding of these belowground signals would contribute to the development of new integrated control strategies against wireworms.