V. J. Msukwa
Department of Forestry, Mzuzu University, Private Bag 201, Luwinga, Mzuzu 2, Malawi
Malawi

C. R. Y. Munthali
Department of Forestry, Mzuzu University, Private Bag 201, Luwinga, Mzuzu 2, Malawi
Malawi

B. I. Nyoka
World Agroforestry Centre, ICRAF Programme, Chitedze Research Station, P.O. Box 30798, Lilongwe 3, Malawi
Malawi

E. Missanjo
Department of Forestry, Forestry Research Institute of Malawi, P.O. Box 270, Zomba, Malawi
Malawi