1. Department of Plant Pathology, University of Stellenbosch, Stellenbosch 7600, South Africa
2. Centraalbureau voor Schimmelcultures, P.O. Box 273, 3740 AG Baarn, Netherlands
3. Department of Microbiology and Biochemistry, University of the Orange Free State, P.O. Box 339, Free State 9300, South Africa
4. Grain Crops Institute, Oil and Protein Centre, P. Bag X1251, Potchefstroom 2520, South Africa