1. R.J. Cook, and E.J. Evans (1979 ) Build-up of diseases with intensification of oilseed rape in England . Proceedings of the 5th International Rapeseed Conference, Malmo, Sweden,1978, pp.333 -337 .
2. G.H. Cunningham (1927 ) Dry rot of swedes and turnips: its cause and control . Bulletin of the New Zealand Department of Agriculture No. 1 33.