Morakinyo Abiodun Bamidele Fakorede, Department of Crop Production & Protection, Faculty of Agriculture, Obafemi Awolowo University, Ile-Ife, NIGERIA, Baffour Badu-Apraku, PMB 5320, Oyo Road, International Institute of Tropical Agriculture-Nigeria, Ibadan, Oyo State, NIGERIA, Abebe Menkir, Carolyn House, 26 Dingwall Road, International Institute of Tropical Agriculture, Croydon, UNITED KINGDOM, Abimbola Oluwaranti, Department of Crop Production & Protection, Obafemi Awolowo University, Ile-Ife, Nigeria and Richard Olutayo Akinwale, Department of Crop Production and Protection, Faculty of Agriculture, Obafemi Awolowo University, ILE-IFE, Nigeria