Acknowledgements:

We thank all farmers and the VITIVAL (Valais association for viticulture) groups for their collaboration and allowing us to do this study on their vineyards. We are grateful to Elisabeth Klaus, Beatrice Schranz and Franziska Arnold for field and lab assistance. To Michael Koch for the bioinformatic support. Financial support was granted by the Swiss National Science Foundation to Alain Jacot (31003A_149780) and to D.S. (P500PB_206883) and to P.N. by the Béatrice Ederer-Weber Foundation and the Vinetum Foundation.