. 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. CHARACTERISTICS OF SOME FORAGE-GRASS DISEASES 11. Net Blotch Net blotch, a fungus disease caused by Helminthosporium dictyoides Drechsl., at- tacks only meadow fescue. Early sjmrptoms appear as irregular brownish areas on the leaves (fig. 11). Lesions are marked with a delicate netted pattern, and it is from this characteristic marking that the disease gets its common name. In the later stages of infection le
. 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. CHARACTERISTICS OF SOME FORAGE-GRASS DISEASES 11. Net Blotch Net blotch, a fungus disease caused by Helminthosporium dictyoides Drechsl., at- tacks only meadow fescue. Early sjmrptoms appear as irregular brownish areas on the leaves (fig. 11). Lesions are marked with a delicate netted pattern, and it is from this characteristic marking that the disease gets its common name. In the later stages of infection leaves wither and die from the tip toward the base. Conidia of the fungus are borne on the lesions or on the withered leaf tips. Conidia are subhyaline to yellow and are typically straight, with three to five septations. Net blotch occurs from late in spring until fall, attaining its greatest severity during midsummer. The disease is favored by periods of humid, hot weather. i Figure 11.— Xet blotch on meadow 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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