1. Department of Microbiology and Plant Pathology and Tree Pathology Co-operative Programme
2. Tree Pathology Co-operative Programme, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria 0002, South Africa
3. Department of Plant Pathology, Universidade Federal de Viçosa, Viçosa MG 36570, Brazil
4. Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa