1. Department of Agricultural Production; Makerere University; P. O. Box 7062 Kampala Uganda
2. Biotechnology and Biosafety Research Centre; Agricultural Research Corporation; P.O. Box 30 Shambat Sudan
3. Crop Protection Centre; Agricultural Research Corporation; P. O. Box 126 Wad Medani Sudan
4. Plant Breeding and Genetic Laboratory; FAO/IAEA Joint Division of NA; International Atomic Energy Agency laboratories; Vienna International Centre; PO Box 100 A-1400 Vienna Austria