. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 165 BUCKWHEAT Blight ^*''' {Corticium vagum), causing death of plants in large areas in the field, was noted in North Carolina. Leaf- spot {Septocylind]-'ium rufomaculans (Pk.) P. & C.) is reported as diminishing the yield in Connecticut. Powdery-mildew {Erysiphe polygoni) is of slight importance. CRUCIFEROUS CROPS: CABBAGE, BRUSSELS SPROUTS, CAULIFLOWER, COLLARD, TURNIP, KOHL-RABI, KALE, RAPE, RADISH, BROCCOLI, RUTABAGA These crop plants are of close kinship and are subject, essentially, to the same diseases. The mor
. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 165 BUCKWHEAT Blight ^*''' {Corticium vagum), causing death of plants in large areas in the field, was noted in North Carolina. Leaf- spot {Septocylind]-'ium rufomaculans (Pk.) P. & C.) is reported as diminishing the yield in Connecticut. Powdery-mildew {Erysiphe polygoni) is of slight importance. CRUCIFEROUS CROPS: CABBAGE, BRUSSELS SPROUTS, CAULIFLOWER, COLLARD, TURNIP, KOHL-RABI, KALE, RAPE, RADISH, BROCCOLI, RUTABAGA These crop plants are of close kinship and are subject, essentially, to the same diseases. The more important of these are internal parasites from the soil, hence spraying is of less benefit than with other crops. , Black-rot -^^'-'^^' ^-^' ^^^' ^^ {Pseudomonas campestris (Pam.) EFS.). — Not only does black-rot destroy the current crop, but since its causal germ remains in the soil, it seriously endangers, if it does not quite prohibit, the subsequent use of the same field for susceptible crops. Its damage to cab- bage in a single season in two counties in Wisconsin was estimated at between $50,000 and $60,000. A large per cent of the dam- age to cabbage in storage Fig. 88. — Cabbage leaf showing an is also attributable to this incipient stage of black-rot. The disease. Cabbage, kale, f^^''' ""^''^ ""*"'-^. ^^* f"^ ^"fs/'^ , ,. f , , , . the veins, is progressing toward the rape, broccoli, kohl-rabl, base of the leaf. After Stewart and Brussels sprouts, collards, ii. 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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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921
