Melo, M.S., Hochschule Geisenheim University, Von-Lade Str. 1, 65366 Geisenheim, Germany ARC Infruitec-Nietvoorbij, Private Bag X5026, 7599 Stellenbosch, South Africa Department of Viticulture and Oenology, Stellenbosch University, Private Bag XI, Matieland 7602, South Africa, South Africa