1. Department of General and Organic Viticulture; Hochschule Geisenheim University; Geisenheim D-65366 Germany
2. Department of Grapevine Breeding; Hochschule Geisenheim University; Geisenheim D-65366 Germany
3. Dienstleistungszentrum Ländlicher Raum Rheinpfalz; Weincampus; Neustadt/W 67435 Germany
4. Fachhochschule Bingen; Bingen am Rhein 55411 Germany
5. Department of Wine Analysis and Beverage Technology; Hochschule Geisenheim University; Geisenheim D-65366 Germany