1. Jagger, I. C., and Chandler, N., Phytopath., 24, 1253 (1934).
2. Fry, P. R., New Zealand J. Sci. and Technol., A, 34, 224 (1952).
3. Yarwood, C. E., Plant Dis. Reporter, 38, 263 (1954).
4. Tomlinson, J. A., and Smith, B. R., Plant Path., 7, 19 (1958).
5. Allen, M. W., Phytopath., 38, 612 (1948).