1. Department of Plant Production and Soil Science; Forest Science Postgraduate Programme; Forestry and Agricultural Biotechnology Institute (FABI); University of Pretoria; Pretoria South Africa
2. Department of Microbiology and Plant Pathology; FABI; University of Pretoria; Private Bag X20 Hatfield Pretoria 0028 South Africa
3. Bindura University of Science Education (BUSE); Bindura Zimbabwe