Danyo G.

Plant Protection Division, Coconut Research Programme, Oil Palm Research Institute, P. O. Box 245, Sekondi, Ghana

M.A. Anyiwe

Department of Economics and Statistics, University of Benin, Benin City, Edo State, Nigeria

Q.E. Osemwegie

Agricultural Economics Division, Nigerian Institute for Oil Palm Research, P.M.B. 1030, Benin City, Edo State, Nigeria