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Gray leaf spot (GLS) is a foliar fungal disease that affects grasses. In grasses other than maize it is caused by Pyricularia grisea, which only infects perennial ryegrass, tall fescue, and St. Augustine grass in places with warm and rainy climates.
Epichloë coenophiala is a systemic and seed-transmissible endophyte of tall fescue, a grass endemic to Eurasia and North Africa, but widely naturalized in North America, Australia and New Zealand. The endophyte has been identified as the cause of the "fescue toxicosis" syndrome sometimes suffered by livestock that graze the infected grass ...
Brown patch symptoms differ depending on the various maintenance practices performed on the turfgrass (mowing height, fertilizer, watering, etc.) Symptoms on turfgrasses that are wet for extended periods and are closely mowed will produce a distinctive gray-purplish bordered ring "smoke-ring" that is up to 50 cm in diameter. [3]
Epichloë typhina would remain the only species in the genus until the discovery of fungal grass endophytes causing livestock intoxications in the 1970s and 1980s, which stimulated the description of new species. [5] Several species from Africa and Asia that develop stromata on grasses were split off as a separate genus Parepichloe in 1998. [6]
Tall fescue is a long-lived tuft-forming perennial (called a bunchgrass in the US), with erect to spreading hollow flowering stems up to about 165 cm (5'6") tall (exceptionally up to 200 cm) which are hairless (glabrous), including the leaf sheaths, but with a short (1.5 mm) ligule and slightly hairy (ciliate) pointed auricles that can wrap slightly around the stem.
How Tall For Warm-Season Grass. Warm-season turfgrass, such as St. Augustine, should be cut between 2.5” and 4”, says Harlow. ... This can cause grass to be more susceptible to diseases. Grass ...
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