Typically the fungus Thielaviopsis basicola, the casual organism for black root rot, is generally considered to be widespread in both cultivated and uncultivated soils; surveys were conducted in the catchments surroun

Thielaviopsis basicola is a ubiquitous soil borne fungal plant pathogen with a wide host ran e. It is the causal agent of black root rot on many agriculturally important crops such as cotton, tobacco and legumes.