1. Agricultural Research Corporation (ARC) P.O. Box 126 Wad Medani Sudan
2. Institute of Crop Science and Plant Breeding I Heinrich‐Buff‐Ring 26-32 D-35392 Giessen Germany
3. Department of Crop ProductionFaculty of Agriculture Khartoum North, Shambat 13314, P.O. Box 32
4. Institute of Epidemiology and ResistanceFederal Centre for Breeding Research on Cultivated Plants Theodor‐Roemer-Weg 4 D-06449 Aschersleben Germany