[1] Sokoine Univ Agr, Dept Crop Sci & Product, Morogoro, Tanzania
[2] Royal Vet & Agr Univ, Plant Pathol Sect, Dept Plant Biol, Danish Seed Hlth Ctr Dev Countries, DK-1871 Frederiksberg, Denmark
[3] Leibniz Univ Hannover, Fac Nat Sci, Inst Plant Dis & Plant Protect, D-30419 Hannover, Germany