Abstract
Wireworms (Coleoptera: Elateridae) are generalist insect pests that aggregate and feed on the roots of various crops, including maize. It remains unclear how they find and choose host plants. Several studies have focused on volatile organic compounds released by roots infested by wireworms, revealing the presence of 2-pentylfuran. We hypothesized that 2-pentylfuran could be a key aggregation cue that attracts wireworms towards roots colonized by conspecifics. In a series of olfactometer assays, we first investigated whether the larvae of click beetles indeed use volatile organic compounds (VOCs) as cues to locate maize roots that are already under attack by conspecifics. Surprisingly, wireworms were found to not only orient towards conspecific larvae feeding on the maize roots, but also to larvae alone. VOCs collections from plants and larvae revealed the presence of 2-pentylfuran, particularly in treatments where larvae were present. In subsequent dual-choice olfactometer assays wireworms exhibited significant attraction to 2-pentylfuran. These results imply that 2-pentylfuran is involved in wireworm aggregation behaviour, and open up opportunities for the development of an attract-and-kill strategy.
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Acknowledgements
The present paper is dedicated to the memory of Rhoxane Schelkens, who took an active role in the laboratory experiments, but who could not read the final version of this manuscript. D. la Forgia was supported by a Ph.D. grant from the Coordinated Integrated Pest Management in Europe (C-IPM), project ElatPro. The authors also thank Dr. Giselher Grabenweger (Agroscope) and Dr. Jörn Lehmhus (JKI) for providing wireworms;and Prof. Georges C. Lognay (Department of Functional and Evolutionary Entomology, GxABT—University of Liège) and Mickaël Gaillard for their scientific support to this study.
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DLF, FV, TCJT designed the experiments, DLF carried out the experiments, CM contributed to the chemical analysis and data interpretation, DLF, FV, TCJT wrote the manuscript. All authors read and approved the manuscript.
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la Forgia, D., Martin, C., Turlings, T.C.J. et al. 2-Pentylfuran: an aggregation attractant for wireworms. Arthropod-Plant Interactions 17, 465–472 (2023). https://doi.org/10.1007/s11829-023-09958-9
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DOI: https://doi.org/10.1007/s11829-023-09958-9