Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 38 California Agricultural Extension Service [Cir. 119 the surface of the dead areas. The stem cankers finally turn black, girdle the main stem, rot the stem and root, and kill the plant. This fungus disease is mentioned here because, like cabbage black rot and yellows, it is one of the most destructive diseases of cabbage and related plants in many parts of the United States, but in California it is unknown. Fig. 19.—Cabbage black-ring disease. Black leg is controlled by the methods of se
Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 38 California Agricultural Extension Service [Cir. 119 the surface of the dead areas. The stem cankers finally turn black, girdle the main stem, rot the stem and root, and kill the plant. This fungus disease is mentioned here because, like cabbage black rot and yellows, it is one of the most destructive diseases of cabbage and related plants in many parts of the United States, but in California it is unknown. Fig. 19.—Cabbage black-ring disease. Black leg is controlled by the methods of seed treatment given under ''Control of Crucifer Diseases' (p. 44). Black Rot.—Withered leaves, with dry, leathery tissue and dark- brown discoloration in the veins running down into the woody part of the stem are an indication of black rot. This disease, caused by Phytomonas campestris, does not itself produce a soft rot or offensive odor, but it is usually followed by secondary effects of this nature. After soft rot sets
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