1. Department of Plant Pathology Kansas State University Manhattan KS 66506‐5502 USA
2. United States Department of Agriculture–Agricultural Research Service (USDA‐ARS), Foreign Disease‐Weed Science Research Unit Ft. Detrick MD 21702‐9253 USA
3. Zambia Agricultural Research Institute Mt. Makulu Central Research Station Lusaka 10101 Zambia
4. International Maize and Wheat Improvement Center (CIMMYT) Texcoco 56237 Mexico