. Distinguishing characteristics of some forage-grass diseases prevalent in the North Central states. Forage plants Diseases and pests Middle West; Grasses Diseases and pests Middle West. CIRCULAR 7 4 7, U. S. DEPARTMENT OF AGRICULTURE. Figure 3.—Stripe smut on Kentucky bluegrass. Stripe Smut Stripe smut, a fungus disease caused by Ustilago striaeformis (West.) Niessl, attacks many grasses and is common on bluegrass. Initial symptoms appear as chlorotic stripes on the blades. Later the stripes become grayish-black (fig. 3). Masses of smut spores are released when the stripes mature and rup- tu
. Distinguishing characteristics of some forage-grass diseases prevalent in the North Central states. Forage plants Diseases and pests Middle West; Grasses Diseases and pests Middle West. CIRCULAR 7 4 7, U. S. DEPARTMENT OF AGRICULTURE. Figure 3.—Stripe smut on Kentucky bluegrass. Stripe Smut Stripe smut, a fungus disease caused by Ustilago striaeformis (West.) Niessl, attacks many grasses and is common on bluegrass. Initial symptoms appear as chlorotic stripes on the blades. Later the stripes become grayish-black (fig. 3). Masses of smut spores are released when the stripes mature and rup- ture. Spores are brown, spherical to oval, and are covered with short spines. Severely infected plants are stunted and dwarfed. Stripe smut develops sys- temically within its host. Thus it is not seasonal in its development and can be found to a greater or less degree any time during the growing season. A second stripe smut, caused by Urocystis agro- pyri (Preuss) Schroet., at- tacks several grasses, in- cluding bluegrass, and can be distinguished from the first only by microscopic examination of its spores, which are formed in balls with one to three fertile spores surrounded by a single layer of empty cells. This smut is not so com- mon on bluegrass as Usti- lago 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 Allison, J. Lewis (Joseph Lewis), 1911-; Chamberlain, Donald W. (Donald William), 1905-. Washington, D. C. : U. S. Dept. of Agriculture
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