1. International Institute of Tropical Agriculture (IITA) Ibadan Nigeria
2. International Potato Center (CIP) Abuja Nigeria
3. Dep. of Agronomy Univ. of Ibadan Ibadan Nigeria
4. Pan African Univ., Institute of Life and Earth Sciences Univ. of Ibadan Ibadan Nigeria
5. Agriculture and Agri‐Food Canada 850 Lincoln Road, PO Box 20280 Fredericton NB E3B4Z7 Canada