. Manual of fruit diseases . Fruit. APPLE DISEASES 135 Hypochnus Leaf-Blight Caused by Hypochnus ochroleuca Noack It is in the humid regions of the Appalachian Mountain valleys that Hypochnus leaf-blight is most destructive. The disease is known, however, fromMaine to Florida, and is most common in North Carolina, Florida, x\labama, Georgia and West A'irginia. The pathogene was probably introduced from Brazil, and is known to attack the apple, pear, quince, snowball and lilac. Si/mptom^\ The chief damage is wrought through the loss of leaves. Affected trees are devitalized, and while twigs are
. Manual of fruit diseases . Fruit. APPLE DISEASES 135 Hypochnus Leaf-Blight Caused by Hypochnus ochroleuca Noack It is in the humid regions of the Appalachian Mountain valleys that Hypochnus leaf-blight is most destructive. The disease is known, however, fromMaine to Florida, and is most common in North Carolina, Florida, x\labama, Georgia and West A'irginia. The pathogene was probably introduced from Brazil, and is known to attack the apple, pear, quince, snowball and lilac. Si/mptom^\ The chief damage is wrought through the loss of leaves. Affected trees are devitalized, and while twigs are killed, this is an indirect injury through the effects of the disease on the foliage. The disease is, then, principally a leaf-blight. From a distance the symptoms are similar in appearance to those of fire-blight, but Hypochnus leaf-blight is clearly distinguished as follows : (1) aftected leaves droop and are matted to- gether, a character not exliibited by fire-blight; (2) small sclerotia are present on twigs adjacent to diseased foliage (Fig. 36); these sclerotia are white when young, but are cinnamon- brown in color when mature; they are roundish or oblong and measure one-eighth of an inch or less in diameter; (3) accompanying the sclerotia are found. Fig. 36. — Hypochnus leaf- blight pathogene ; sclerotia on apple-twit?.. 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 Hesler, L. R. (Lexemuel Ray); Whetzel, Herbert Hice, 1877-1944. New York : Macmillan
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