1. MSc. student, Department of Agricultural Economics, University of Nairobi P.O. Box 29053-00625, Kangemi, Kenya.
2. MSc. student, International Centre of Insect Physiology and Ecology, P.O. Box 30772-00100, Nairobi, Kenya.
3. Senior lecturer, Department of Agricultural Economics, University of Nairobi P.O. Box 29053-00625, Kangemi, Kenya.
4. Senior Scientist, International Centre of Insect Physiology and Ecology, P.O. Box 30772-00100, Nairobi, Kenya.