@INPROCEEDINGS {THOTTAPPILLY: 1985, title = {Worldwide occurrence and distribution of virus diseases}, author = {Thottappilly, G. and Rossel, H. W. }, editor = {Singh, S. R. and Rachie, K. O. }, booktitle = {Cowpea Research, Production and Utilization}, year = {1985}, pages = {115--171}, }