Abstract
Xylosandrus compactus is a polyphagus pest that cultivates a symbiotic fungus Fusarium solani in tunnels of host plants for food and is a major threat to coffee production in East Africa. We hypothesized that the female X. compactus, which is the only sex capable of flying to attack its hosts, is attracted to volatiles from F. solani. We investigated responses of females to volatiles released by fungal cultures and bioactive components identified in the fungal volatiles. In Y-tube olfactometer assays, ~68% of females were attracted to volatiles emitted from F. solani over clean air. Bioactive compounds were identified in the fungal volatiles by coupled gas chromatography (GC)/electroantennographic detection (EAD) and GC/mass spectrometric analyses as methyl isovalerate and 2,3-butanediol. We also identified ethanol, a known attractant of X. compactus, using solid phase microextraction captured fungal volatiles analyzed by GC/MS. In field trapping trials, we compared captures of females in plastic bottle traps baited with a range of doses of methyl isovalerate, 2,3-butanediol, and blends of the two compounds, with similar traps baited with solvent only and ethanol. Females were caught by all the baited traps at all the concentrations tested except traps baited with solvent only. Trap captures were however 14–37-fold lower in traps baited with single components and the blends than those baited with ethanol. The possible use of these components as a tool for kairomonal monitoring of populations of X. compactus is discussed.
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Acknowledgements
We thank Hillary Kirwa and Onesmus Wanyama for technical assistance at icipe; and Rajab Ogogol, Isaac Okiring, and Isaac Ogari for laboratory and field assistance at the National Coffee Research Institute (NaCORI), Mukono, Uganda. We are grateful for administrative support from the leadership and staff of icipe and NaCORI, where the studies were conducted. A post-doctoral fellowship to the first author to undertake this research was obtained from the German Academic Exchange Service (Code Number: A/13/93772) through icipe’s Capacity Building and Institutional Development programme, for which we are grateful. We also appreciate the anonymous reviewers for their critical comments.
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Communicated by Jarmo Holopainen.
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Egonyu, J.P., Torto, B. Responses of the ambrosia beetle Xylosandrus compactus (Coleoptera: Curculionidea: Scolytinae) to volatile constituents of its symbiotic fungus Fusarium solani (Hypocreales: Nectriaceae). Arthropod-Plant Interactions 12, 9–20 (2018). https://doi.org/10.1007/s11829-017-9552-2
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DOI: https://doi.org/10.1007/s11829-017-9552-2