@ARTICLE {WILLIAMS:1976b, title = {Major research needs in plant protection and plant quarantine in Africa}, author = {Williams, R. J. }, journal = {African Journal of Plant Protection}, year = {1976}, month = {October}, issn = {0379-6930}, note = {Interafrican Symposium on the Role of Plant Protection in Crop Improvement in Africa, Ibadan, Nigeria, 7-12 October, 1974}, }