1. Department of Biological Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
2. Department of Plant Pathology, University of California, Davis
3. Biological Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
4. Texas A&M AgriLife Research and Extension Center, Weslaco, TX 78596
5. Department of Crop Protection, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
6. International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria
7. Department of Plant Pathology & Microbiology, Texas A&M AgriLife Research and Extension Center, Weslaco, TX 78596.