1. Citrus Research International; PO Box 28 Nelspruit 1200 South Africa
2. Department of Genetics; Stellenbosch University; Private Bag X1 Matieland Stellenbosch 7602 South Africa
3. Agricultural Research Council; Infruitec-Nietvoorbij (The Fruit, Vine and Wine Institute); Private Bag X5026 Stellenbosch 7599 South Africa