. 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 Ergot Ergot, a fungus disease caused by Claviceps pur- purea (Ft.) Tul., attacks many grasses and is com- mon on smooth bromegrass. It attacks only the flower and seed parts of its host and is of economic impor- tance only when grasses are grown for a seed crop or are allowed to flower and set seed prior to grazing or cut- ting for hay. The initial symptoms appear
. 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 Ergot Ergot, a fungus disease caused by Claviceps pur- purea (Ft.) Tul., attacks many grasses and is com- mon on smooth bromegrass. It attacks only the flower and seed parts of its host and is of economic impor- tance only when grasses are grown for a seed crop or are allowed to flower and set seed prior to grazing or cut- ting for hay. The initial symptoms appear at flower- ing time, when a sticky exudate, called the honey- dew stage, is noticeable. This exudate, containing the conidial stage of the fungus, attracts flies and other insects, and much secondary infection results from insect transmission. As the disease progresses, black horny bodies called sclerotia develop in place of seeds (fig. 9). TV hen ma- ture, the sclerotia fall to the ground or are harvested with the seed crop. In either case, they carry the fungus over winter. AT hen planted with the seed or carried over on the ground by natural means, they develop the perfect spore stage of the fungus the fol- lowing summer, and the spores released cause the initial infection each year. Ergot development is fa- vored by periods of warm,. 1 P. 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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