. 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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