. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 235 ^^' -^^ — The centers of the tubers turn black or become hollow with a black lining. This is due to ab- normal physical conditions, such as high temperature, or deficiency of oxygen, and occurs mainly in potatoes stored in artificially heated rooms, or piled too deep (over 6 ft.). Temperatures above 35° C. (95° F.) should be avoided, and ventilation Fig. 131. — Black-heart of potato caused by exclusion of air. Stewart and Mix. After Spindling-sprout, the cause of which is unknown, is a diseased
. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 235 ^^' -^^ — The centers of the tubers turn black or become hollow with a black lining. This is due to ab- normal physical conditions, such as high temperature, or deficiency of oxygen, and occurs mainly in potatoes stored in artificially heated rooms, or piled too deep (over 6 ft.). Temperatures above 35° C. (95° F.) should be avoided, and ventilation Fig. 131. — Black-heart of potato caused by exclusion of air. Stewart and Mix. After Spindling-sprout, the cause of which is unknown, is a diseased condition in which the normal stout thick sprouts fail to develop and in their stead are slender abnormally long sprouts. Seed potatoes affected with this disease result in an uneven stand with many missing hills, weak plants, and cor- responding decrease in yield. Hollow-heart.—In years of abundant rainfall large pota-. 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- [from old catalog]; Hall, John Galentine, 1870- [from old catalog] joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
