1. Dep. of Crop Science; Univ. of Zimbabwe; P.O. Box MP 167 Mt. Pleasant Harare Zimbabwe
2. Maize Program; International Maize and Wheat Improvement Center; Box MP163 Mt. Pleasant Harare Zimbabwe
3. Dep. of Agricultural Production; Makerere Univ.; Box 7062 Kampala Uganda
4. Dep. of Plant, Soil, and Agricultural Systems; Southern Illinois Univ.; Carbondale IL 62901