@ARTICLE {HERREN:1983, title = {The Africa-wide biological control programme of cassava mealybug and green spider mites: achivement and control strategies}, author = {Herren, H. R. }, journal = {Paper presented at USAID Regional Meeting 7-11 December 1983, Harare, Zimbabwe}, year = {1983}, pages = {7--11}, note = {RTB; Root and Tuber; Cassava}, }