1. CSIR‐Crops Research Institute P.O. Box 3785, Fumesua Kumasi Ghana
2. International Institute of Tropical Agriculture (IITA) PMB 5320, Oyo Rd Ibadan Nigeria
3. West Africa Centre for Crop Improvement (WACCI) Univ. of Ghana PBM 30 Legon Accra Ghana
4. Cocoa Research Institute of Ghana New Tafo‐Akim Ghana