CLOVER rot, caused by the fungus Sclerotinia trifoliorum Erikss., occurs in about 70 per cent of farm crops of red clover (Trifolium pratense) in Great Britain, according to a recent survey by Lester and Large1. But there are few reports of this fungus infecting white clover (Trifolium repens). Moore2, Sampson and Western3 and Dillon Western, Loveless and Taylor4 have reported occasional damage in white clover in Great Britain, but in no instance was the disease considered to be of economic importance.