1. School of Biological Sciences, University of Nairobi, Nairobi, Kenya
2. Department of Plant Pathology, Stellenbosch University, Matieland, South Africa
3. Kenya Agricultural and Livestock Research Organization, Nairobi, Kenya
4. Agricultural Research Council - Grain Crops Institute, Potchefstroom, South Africa
5. International Maize and Wheat Improvement Center (CIMMYT), Nairobi, Kenya