Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 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 provided. Fig. 131. — Black-heart of potato caused by exclusion of air. After Stewart and Mix. Spindling-
Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 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 provided. Fig. 131. — Black-heart of potato caused by exclusion of air. After Stewart and Mix. 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-
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