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A new disease of chinese cabbage has been observed since 1966, and the occurrence area has been gradually increasing every year.The leaves of the diseased plants turn blight yellow in color, and the plants are a little stunted. These plants do not form compact central heads even near a harvest time. Their roots and stems become dark brown or blackened in the vascular tissues.Hyphae were always observed in the vascular tissues of the diseased plants. Fusarium oxysporum, the suspected causal fungus, was never isolated from the freshly dissected stem or root tissues of the diseased plants. Cephalosporium sp. was one of the most frequently isolated fungi, but its pathogenicity onto chinese cabbages was not positive. Verticillium albo-atrum is another frequently isolated fungus. It showed pathogenicity onto 3 varieties of chinese cabbages tested under a greenhouse condition at 20C. The symptoms of the plants grown in artificially infested soils were more or less identical with those in naturally infested soils. In addition, V. albo-atrum was recovered from the diseased plants. Vascular discoloration of the roots or the stems were generally observed in some 40 days after seeding in the artificially infested soil at 20C.As Verticillium disease of chinese cabbage in nature appears not to have been previously reported, this plant may be included as a new host of this fungus. “Yellows” (Japanese name, Ohkabyo) may be coined to this new disease.

A New Disease of Chinese Cabbage Caused by Verticillium albo-atrum and Some Factors Related to the Incidence of the Disease