1. Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Natural and Agricultural Sciences (NAS), University of Pretoria, Pretoria, South Africa
2. College of Forestry and Conservation, Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, Montana, USA
3. Department of Plant and Soil Sciences, FABI, NAS, University of Pretoria, Pretoria, South Africa