1. W. Crosier(1934 ). Studies in the biology ofPhytophthora infestans(Mont.) De Bary.Mem. Cornell. Univ. agric. Exp. Sta.no. 155.
2. J. L. Jensen, and E. Rostrup(1892 ). Report on recent experiments in checking potato disease in the United Kingdom and abroad (C-6647).Bd. Agric. G.B.I..