1. Department of Agricultural Extension, University of Ghana, P.O. Box 68, Legon, Ghana
2. Communication and Innovation Studies Group, Wageningen University, Wageningen, The Netherlands
3. Cocoa Research Institute of Ghana, New Tafo, Ghana
4. Laboratory of Entomology, Wageningen University, Wageningen, The Netherlands
5. Crop Science Department, University of Ghana, Legon Accra, Ghana
6. Agricultural Extension Department, University of Ghana, Legon Accra, Ghana