Pyrenochaeta lycopersici. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Pyrenochaeta lycopersici. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Lycopersicon esculentum; also on Capsicum and Nicotiana. DISEASE: Brown root rot or corky root of tomato (Lycopersicon esculentum). In Europe it seems to occur only in crops grown in close succession under glass. The plants lack vigour, become stunted and give poor yields. There is a cortical rot of the fine and medium sized roots; larger roots become corky with swollen, cracked and furrowed bark, almost canker-like; finally the stem base may rot. GEOGRAPHICAL DISTRIBUTION: Canada, Belgium, France, Germany, Italy, Netherlands, New Zealand, Rumania, Scandinavia, UK (24, 78; 42, 491; 50, 3178; Last et al, NAAS Quarterly Review 62: 68, 1963). TRANSMISSION: Soil-borne. This fungus occurs in a sterile mycelial state within corky root of tomatoes and pycnidia have not been found in the natural state.