Y. Cwala1, C. P. Laubscher1, P. A. Ndakidemi1* and A. H. Meyer2
1Department of Horticultural Sciences, Faculty of Applied Sciences, Cape Peninsula University of Technology, P.O. Box 652, Cape Town 8000, South Africa.
2ARC Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch, 7599, South Africa.
