1. Plant Pathology Unit International Institute of Tropical Agriculture PMB 5320 Ibadan Nigeria
2. Institute for Plant Diseases, Phytopathology and Nematology in Soil Ecosystems University of Bonn Bonn Germany
3. Department of Plant Pathology North Carolina State University Raleigh North Carolina USA
4. Department of Crop Protection and Environmental Biology University of Ibadan Ibadan Nigeria
5. USDA‐ARS Division of Plant Pathology and Microbiology Department of Plant Sciences University of Arizona Tucson Arizona USA