@INPROCEEDINGS {HANNA:2004, title = {The African root and tuber scale problem in Central Africa: the nature of the problem and the search for control options}, author = {Hanna, R. and Tindo, M. and Wijnans, L. and Goergen, G. and Tata-Hangy, K. * and Lema, K. and Toko, M. and Ngeve, J. and Gockowski, J. }, booktitle = {9th Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch, 31 October-5 November 2004, Mombasa, Kenya}, year = {2004}, note = {RTB; Root and Tuber}, }