1. Adamson, A. (1972). A.D.A.S. Q. Rev.
6, 1–11.
2. Anonymous (1974). European and Mediterranean Plant Protection Organisation Publications, Series B. 77.
3. O’Bannon, J.H. and Reynolds, H.W. (1965). Soil Sci.
99, 251–5.
4. Bergeson, G.B. (1966). Phytopathology
56, 1287–9.
5. Bergeson, G.B. (1968). Phytopathology
58, 49–53.