. Fig. 31.—Blackheart of potato. field, care being taken to remove and destroy any tubers which have formed. Seed treatment for other diseases like scab and rhizoctonia, to- gether with crop rotation, will help to control this. Dry Rot.—Potatoes in storage often show a dry, powdery or leathery type of decay which usually starts from bruises on the surface. High temperature and humidity and poor ventilation favor this, since these conditions are favorable to the fungus, a species of Fusariuni, which causes dry rot. Careful handling, cold-storage rooms at a temperature between 36° and 40° Fahren
. Fig. 31.—Blackheart of potato. field, care being taken to remove and destroy any tubers which have formed. Seed treatment for other diseases like scab and rhizoctonia, to- gether with crop rotation, will help to control this. Dry Rot.—Potatoes in storage often show a dry, powdery or leathery type of decay which usually starts from bruises on the surface. High temperature and humidity and poor ventilation favor this, since these conditions are favorable to the fungus, a species of Fusariuni, which causes dry rot. Careful handling, cold-storage rooms at a temperature between 36° and 40° Fahrenheit and with good ventilation, and control of other tuber-rotting diseases, help to reduce losses from dry rot. Early Blight.—Brown, circular, dead areas develop on the leaves, blighting and killing them and defoliating the plants. This fungus dis- ease, caused by Alternaria solmii, is sometimes seen in California but is not often serious.
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Keywords: ., bookcentury1900, booksubjectagriculturalpests, booksubjectplantd
