@BOOK {OFFEI:2001, title = {Viruses and viral diseases of yams in Ghana}, author = {Offei, S. * and Olatunde, O. and Hughes, J. and Kenyon, L. }, booktitle = {Abstrcts of the Fifth Biennial Conference of the African Crop Science Society, 21-26 Oct. Lagos, Nigeria}, year = {2001}, note = {RTB; Root and Tuber; Yam}, }