Authors
B. I. Nyoka
Forestry Commission, Forest Research Centre,, Harare, Zimbabwe
World Agroforestry Centre, Chitedze Agricultural Research Station, ICRAF-Southern Africa Programme, P. O. Box 30798,, Lilongwe, Malawi
P. Tongoona
University of Kwa-Zulu-Natal, African Centre for the Crop Improvement, P. Bag X01, Scottsville,, Pietermaritzburg, South Africa
C. M. Gumbie
Forest Research Centre, Forestry Commission, P. O. Box HG595, Highlands,, Harare, Zimbabwe