[1] Zambia Agr Res Inst, Lusaka, Zambia
[2] Univ Nairobi, Dept Plant Sci & Crop Protect, Coll Agr & Vet Sci, Nairobi, Kenya
[3] Univ Zambia, Sch Biol Sci, Great Rd Campus, Lusaka, Zambia
[4] Int Inst Trop Agr, Southern African Res Hub Zambia, Lusaka, Zambia
[5] Univ Calif Davis, Dept Plant Pathol, Davis, CA 95616 USA
[6] Univ Zambia, Sch Vet Med, Great East Rd Campus, Lusaka, Zambia
[7] Texas A&M Univ, Dept Plant Pathol & Microbiol, Weslaco, TX 78596 USA