1. Plant Pathology, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa
2. Tree Improvement, Institute for Commercial Forestry Research, Scottsville, South Africa
3. Agricultural Research Council–Animal Production, c/o University of KwaZulu-Natal, Pietermaritzburg, South Africa
4. Agricultural Research Council–Vegetable, Industrial and Medicinal Plants, Pretoria, South Africa
5. Analytical Laboratory, Institute for Commercial Forestry Research, Scottsville, South Africa