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Waxy bloom on grape berry surface is one important factor for oviposition of European grapevine moths

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Abstract

Grapevine moths are severe pest insects in European viticulture. Oviposition by grapevine moths is largely influenced by several physical and chemical cues located on the surface of their host plant’s fruits. The contribution of waxy bloom layer on the berry surface for oviposition decision of two European grapevine moth species, Eupoecilia ambiguella and Lobesia botrana, was investigated. An experimental setup was developed to prove oviposition preferences of both species for certain grape varieties and developmental stages based on epicuticular wax extracts. Chemical analysis of epicuticular wax patterns of four different Vitis vinifera varieties revealed differences. However, oleanolic acid was the main component on berry surface waxes and its relative amount decreased between early and late phenological stages. Furthermore, oleanolic acid was responsible for the preference of earlier phenological stages for E. ambiguella oviposition. However, ovipositional variety preferences were triggered by minor components on the wax berry layer. While the oviposition decision of L. botrana was mainly triggered by oleanolic acid, additional cues like olfactory and haptic ones were also important. The ovipositional preferences were discussed in accordance with the results of the chemical analysis in order to elucidate the role of wax compounds for oviposition stimulation.

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Acknowledgements

We thank Svenja Stein and Sandra Schubach (JKI, Dossenheim, Germany) for excellent laboratory assistance. We are grateful to Adrian Brückner (Technical University of Darmstadt, Germany) and Doreen Gabriel (JKI, Braunschweig, Germany) for statistical advices. We thank Sandra Biancu and Claudia Vogel (JKI, Siebeldingen, Germany) for cultivation of insects. The authors thank Patricia Mohr (Keyence GmbH, Neu-Isenburg, Germany) for providing the digital microscope free of charge. MR and AM were supported by funds of the Federal Ministry of Food and Agriculture (BMEL) based on a decision of the Parliament of the Federal Republic of Germany via the Federal Office for Agriculture and Food (BLE) under the innovation support Program Number 2814701611.

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Correspondence to Jürgen Gross.

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Communicated by P. G. Becher.

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Fig. S1

Chromatograms of berry wax extracts from V. vinifera ‘Regent’ at BBCH 77 (above) and BBCH 89 (bottom, mirrored) obtained after derivatization and GC-FID analysis. IS = Internal standard = Tetracosane, OA = Oleanolic acid, MA = Montanic acid. (TIFF 37 kb)

Supplementary material 2 (DOCX 16 kb)

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Rid, M., Markheiser, A., Hoffmann, C. et al. Waxy bloom on grape berry surface is one important factor for oviposition of European grapevine moths. J Pest Sci 91, 1225–1239 (2018). https://doi.org/10.1007/s10340-018-0988-7

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  • DOI: https://doi.org/10.1007/s10340-018-0988-7

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