. Diseases of economic plants. Plant diseases. 56 Diseases of Economic Plants It may easily be rubbed off with a cloth. The loss in ready salability, due to the unsightliness of the fruit, is reason enough for protective sprayings. Bordeaux mixture applied at intervals of about two weeks from the middle of June until the middle of August is effective. -Fly-speck. ^"- — Growing upon the surface of the fruit and forming numerous clustered black specks closely resembling. Fig. 27. — Fly-speck (at left); Sooty-blotch (at right). After Colby. fly-specks, this fungus causes disfigurement of the
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. Diseases of economic plants. Plant diseases. 56 Diseases of Economic Plants It may easily be rubbed off with a cloth. The loss in ready salability, due to the unsightliness of the fruit, is reason enough for protective sprayings. Bordeaux mixture applied at intervals of about two weeks from the middle of June until the middle of August is effective. -Fly-speck. ^"- — Growing upon the surface of the fruit and forming numerous clustered black specks closely resembling. Fig. 27. — Fly-speck (at left); Sooty-blotch (at right). After Colby. fly-specks, this fungus causes disfigurement of the apple. The generic position of the fungus is in doubt, though it was originally named Lahrella pomi by Montague. Volutella rot*^^ (Volutella fructi S. & H.). — In general appearance the volutella rot is not readily distinguished from black-rot, though the texture of the rotted tissue is much firmer and drier. Under the hand lens the sporiferous pustules are seen to be clothed with numerous hairs, which character sufficiently marks it as a separate disease. It has been reported from North Carolina, New York, Wisconsin, and is probably of general distribution. Scurf, an affection of the bark of twigs, is due to Phyllo- stida prunicola (Opiz.) Sacc.; Bark-canker '- due to Myxospo-. 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 work.. Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York, Macmillan