. Diseases of economic plants. Plant diseases. 376 DISEASES OF ECONOMIC PLANTS Leptosphaeriose (Leptosphceria tritici Pass.). — In Ne- braska, Heald1 reported a disease in which the lower leaves were killed early in the season, and the whole field was pale in color. The loss was not large. Septoriose (Septoriasp.). — Septoriose has been noted by Selby2 as small, dark spots upon the chaff of certain varieties of wheat. No damage was Fig. 161. — Wheat kernels; a, normal; b, shrunken and killed by scab. After Manns. Scab (Gibberella Saubinetii (Mont.) Sacc). — This scab, first describ
. Diseases of economic plants. Plant diseases. 376 DISEASES OF ECONOMIC PLANTS Leptosphaeriose (Leptosphceria tritici Pass.). — In Ne- braska, Heald1 reported a disease in which the lower leaves were killed early in the season, and the whole field was pale in color. The loss was not large. Septoriose (Septoriasp.). — Septoriose has been noted by Selby2 as small, dark spots upon the chaff of certain varieties of wheat. No damage was Fig. 161. — Wheat kernels; a, normal; b, shrunken and killed by scab. After Manns. Scab (Gibberella Saubinetii (Mont.) Sacc). — This scab, first described in 1884 in England, seems to be quite gen- erally distributed in America, and is sometimes, though not usually, the cause of considerable loss. Under condi- tions favorable to the disease the loss may reach 10 per cent. It appears only upon the heads when about half ripe, as yel- low or pink incrustations on the spikelets, on the bases of the glumes, or covering the rachis. The affected spikelets ripen prematurely and turn yellow before the normal parts 1 Heald, F. D., Neb. Agr. Exp. Sta. Rpt. 19, 46, 1906. 2 Selby, A. D., Ohio Agr. Exp. Sta. Bui. 97, December 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, 1871-1934; Hall, John Galentine, 1870- joint author. New York, The Macmillan Company
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