. Diseases of economic plants . Plant diseases. VEGETABLE AND FIELD CROPS 211 CABBAGE Black rot (Pseudomonas campestris (Pamm.) E. F. Smith). —Not only does black rot destroy the crop of the year, but since its causal germ remains in the soil, it seri- ously endangers, if it does not quite prohibit, the subse- quent use of the same field for susceptible crops. Its damage in a single season in two counties in Wisconsin was estimated at be- tween $50,000 and $60,000. A large per cent of the damage to cabbage in storage is also attributable to this disease. Cabbage, kale, rape, broccah, kohl- rab
. Diseases of economic plants . Plant diseases. VEGETABLE AND FIELD CROPS 211 CABBAGE Black rot (Pseudomonas campestris (Pamm.) E. F. Smith). —Not only does black rot destroy the crop of the year, but since its causal germ remains in the soil, it seri- ously endangers, if it does not quite prohibit, the subse- quent use of the same field for susceptible crops. Its damage in a single season in two counties in Wisconsin was estimated at be- tween $50,000 and $60,000. A large per cent of the damage to cabbage in storage is also attributable to this disease. Cabbage, kale, rape, broccah, kohl- rabi, Brussels sprouts, collards, turnips, ruta- bagas, radish, black mustard, charlock, and other members of the cress family are affected. It was first noted in 1895' in Wisconsin, and has since proved very disastrous in its effects in practically all sections of the United States. The first sign of the disease appears upon the edges of the leaves as a blackening of the veins. The affected region ' Proc. Amer. Assoc. Adv. Sci. 1895, p. 93; cited in Wis. Agr. Exp. Sta. Bui. 65, p. 10, February, Fig. 95.—Cabbage leaf shoi\ing an incipient stage of blaclc rot. Tlie disease, which enters at the ends of the veins, is progressing toward the base of the leaf. After Stewart and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York : Macmillan
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