@PROCEEDINGS {OKIGBO:1987c, title = {Overview of the technical crisis in subsistence agriculture in Africa: Problems and Prospects}, author = {Okigbo, B. }, editor = {Amoaka-Atta, B. }, booktitle = {Proceedings of the 6th African Association of Insect Scientists (AAIS) Conference, Monrovia}, year = {1987}, number = {pp. 57 - 92}, publisher = {African Bioscience Network/Unesco}, address = {Darker}, }