. Diseases of economic plants . Plant diseases. 386 DISEASES OF ECONOMIC PLANTS most other rusts; indeed other forms of spores are almost entirely absent in most parts of the country, throwing the burden of perpetuation of the species entirely upon the uredo mycehum and its spores. This stage is known to be peren- nial as far north as Washington, DC, and Lincoln, Neb. The rust is very destructive, and seems to be limited to this one host. Smut. See timothy. Anthracnose. See rye. CLOVER Black mold (Phyl- lachora Trifolii (Pers.) Fckl.).— Common red clover, crimson clover, white clover, alsike c
. Diseases of economic plants . Plant diseases. 386 DISEASES OF ECONOMIC PLANTS most other rusts; indeed other forms of spores are almost entirely absent in most parts of the country, throwing the burden of perpetuation of the species entirely upon the uredo mycehum and its spores. This stage is known to be peren- nial as far north as Washington, DC, and Lincoln, Neb. The rust is very destructive, and seems to be limited to this one host. Smut. See timothy. Anthracnose. See rye. CLOVER Black mold (Phyl- lachora Trifolii (Pers.) Fckl.).— Common red clover, crimson clover, white clover, alsike clover, and several other related plants are affected by this mold. The chief symptoms are pale spots upon the upper sides of the leaves accompanied by black dots on the lower sides. These spots at first glance so strongly resemble the sori of the rusts as to lead the disease to be mistaken for a rust by the casual observer. Though the disease is often of considerable damage, no treatment is known. Sclerotiniose, wilt (Sclerotinia Trifoliorwn Eriks.). — This wilt is possibly identical with the wilt of alfalfa. In any event it resembles it very closely. It was first noted in America, in Delaware, by Chester in 1889, later in New Jersey by Fig. 165. —Clover leaf showing spota of black mold. 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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