1. Gundy, S. D. van and Walker, J. C. (1957). Phytopathology 47, 35.
2. Sitterley, W. R. (1972). A. Rev. Phytopath. 10, 471–90.
3. Harwood, R. R. and Markarian, D. (1968). J. Hered. 59, 126–30.
4. Shanmugasundrum, S., Williams, P. H. and Peterson, C. E. (1971). Phytopathology 61, 1218–21.
5. Crossan, D. F. and Sasser, J. M. (1969). PL Dis. Reptr 53, 452–3.