1. Dep. of Plant BreedingSouth African Sugarcane Research Institute P. Bag X02 Mount Edgecombe 4300 Republic of South Africa
2. Univ. of the Free State PO Box 339 Bloemfontein 9300 Republic of South Africa
3. Univ. of KwaZulu‐Natal P. Bag X01, Scottsville Pietermaritzburg 3209 Republic of South Africa