1. South African Grape and Wine Research Institute, Department of Viticulture and Oenology, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, 7602 Matieland, South Africa
2. South African Grape and Wine Research Institute, Department of Viticulture and Oenology, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, 7602 Matieland, South Africa astrid.buica@gmail.com