@ARTICLE {SIMONS: 1994, title = {Quantitative methods for assessing the severity of anthracnose on yam (Dioscorea alata)}, author = {Simons, S. A. and Green, K. }, journal = {Tropical Science}, year = {1994}, volume = {34}, pages = {216--224}, issn = {0041-3291}, note = {RTB; Root and Tuber; Yam}, }