@ARTICLE {ROBERTS:1993a, title = {The ability of Aphis craccivora, A. gossypii, and A. citricola to transmit single and mixed viruses to cowpeas}, author = {Roberts, J. M. F. and Thottappilly, G. and Hodgson, C. J. }, journal = {Journal of Phytopathology}, year = {1993}, volume = {138}, pages = {164--170}, }