1. National Root Crops Research Institute (NRCRI) Umudike, Umuahia Nigeria
2. Natural Resources Institute University of Greenwich Central Avenue Chatham Maritime KentME4 4TBUK
3. CIRAD UMR QUALISUD MontpellierF‐34398France
4. Qualisud, Univ Montpellier, CIRAD, Montpellier SupAgro, Univd'Avignon Univ de La Réunion Montpellier34398France
5. International Institute of Tropical Agriculture (IITA) Oyo Road Ibadan Nigeria
6. Department of Global Development Cornell University Ithaca NY14853USA