1. CSIR-Savanna Agricultural Research Institute, Tamale, Ghana
2. CSIR-Savanna Agricultural Research Institute, Wa, Ghana
3. Department of Agronomy, University for Developmental Studies, Tamale, Ghana
4. Agronomy Department, University of Florida, Gainesville, FL, USA
5. Department of Entomology, North Carolina State University, Raleigh, NC, USA
6. Department of Crop Science, North Carolina State University, Raleigh, NC, USA