. Diseases of economic plants . Plant diseases. FORAGE CROPS 395 The disease is very widespread, but even in the worst seasons does not do much injury. Angular leaf spot (Cer- cospora cruenta Sacc). — The angular leaf spots of this disease are a famil- iar sight in most cowpea fields. They are of vari- ous colors above, chiefly reddish, and are gray to purphsh or slate-colored below. The damage is rarely very great. In some in- stances the attack may proceed to the stems, where, especially at the base, it may cause crack- ing and result in such lowering of the vigor of the plant as to cause sh
. Diseases of economic plants . Plant diseases. FORAGE CROPS 395 The disease is very widespread, but even in the worst seasons does not do much injury. Angular leaf spot (Cer- cospora cruenta Sacc). — The angular leaf spots of this disease are a famil- iar sight in most cowpea fields. They are of vari- ous colors above, chiefly reddish, and are gray to purphsh or slate-colored below. The damage is rarely very great. In some in- stances the attack may proceed to the stems, where, especially at the base, it may cause crack- ing and result in such lowering of the vigor of the plant as to cause shedding of leaves and failure to properly fill the pods. The loss of leaves is of course serious to the hay value of the Fig. 172. — Leaflet of cowpea showing cer- coaporose spots. Original. JAPAN CLOVER Powdery mildew {Microsphoei-a diffusa C. & Peck). — The usual characters of the powdery mildews distinguish this disease sufficiently. The injury to this valuable southern forage plant, while considerable, is never suffi- cient to call for 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-. New York : Macmillan
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