Abstract
In laboratory experiments, we identified and quantified volatiles emitted by inflorescences and berries of two grape varieties (Trebbiano and Sangiovese) and examined the effects of the volatiles on oviposition by the grapevine moth Lobesia botrana. Compared to Trebbiano, Sangiovese is relatively more susceptible to L. botrana infestations under natural conditions. Chemical and electrophysiological analysis indicated only quantitative differences between the volatiles released by the two varieties. In a dual-choice oviposition bioassay based only on volatile cues, females did not show any preference between the two varieties. The six major components of the odor profiles that were GC-EAD-active to female antennae included: limonene, 4,8-dimethyl-1,(E)-3,7-nonatriene, (±)-linalool, (E)-caryophyllene, (E,E)-α-farnesene, and methyl salicylate. At the beginning of the berry touch phenological stage, their proportions were about 10:0.6:0.4:0.5:0.9:0.6 in Trebbiano and 10:1:0.4:1.5:0.4:0.3 in Sangiovese. A six-component synthetic lure (with the proportion 10:1:1:1:1:1, which approximated the ratio of components released by both varieties) was used in further laboratory oviposition bioassays. Depending on its dosage, the synthetic lure either attracted or repelled oviposition. L. botrana females laid significantly more eggs in the presence of either the grape bunches or the synthetic lure at the attractive dosage. In a release-capture experiment conducted in a field cage that covered two grapevine rows, the synthetic lure was more attractive than a grape cluster or a blank control, and it stimulated oviposition on the vegetation near the lure. The results indicate that L. botrana uses olfactory cues to select oviposition sites and that an artificial lure, containing the major volatiles released by two grape varieties, may be useful in monitoring female activity in the field.
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Acknowledgements
We are grateful to Prof. Ingve Stenstrøm, Agricultural University of Norway, Department of Chemistry and Biotechnology (Aas, Norway) for the synthesis of (E)-DMNT. We thank Elisabetta Leonardelli, Elena Pozzolini, and Anna Eriksson for technical assistance. We thank the anonymous reviewers for helpful comments. This study was funded by the Government of Autonomous Province of Trento (HOST and INTERPLAY Research Projects) and by the Italian Ministry of University and Research (PRIN 2006).
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Anfora, G., Tasin, M., De Cristofaro, A. et al. Synthetic Grape Volatiles Attract Mated Lobesia botrana Females in Laboratory and Field Bioassays. J Chem Ecol 35, 1054–1062 (2009). https://doi.org/10.1007/s10886-009-9686-5
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DOI: https://doi.org/10.1007/s10886-009-9686-5