{"id":49821,"date":"2022-12-13T09:58:57","date_gmt":"2022-12-13T09:58:57","guid":{"rendered":"https:\/\/dev.metos.global\/?page_id=49821"},"modified":"2026-05-04T10:34:18","modified_gmt":"2026-05-04T10:34:18","slug":"disease-models-turf-grass","status":"publish","type":"page","link":"https:\/\/metos.global\/en\/disease-models-turf-grass\/","title":{"rendered":"Disease models – turf grass"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Disease\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Turf grass<\/b> disease models\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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COTTON BLIGHT \u2013<\/br>Phytium blight<\/em><\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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DOLLAR SPOT \u2013<\/br>Sclerotinia homoeocarpa<\/em><\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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BROWN PATCH \u2013<\/br>Rhizoctonia solani<\/em><\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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SNOW MOLD \u2013<\/br>Typhula spp.<\/em><\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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OVERSEEDING<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tRecommended equipment<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Cotton blight<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The disease Phytium blight, also known as Cotton Blight, Grease Spot is caused by several different Pytium species. Cool-season turfgrasses are susceptible to Pythium. Under favourable conditions, the whole turfgrass could be destroyed within a few days.<\/p>

Symptoms<\/h3>

Pythium symptoms will first appear as small, irregularly shaped spots, which will join together to form large patches that will often be long streaks. Pythium often develops into these streaks because it is the direction of water movement (drainage) most often ruts from golf carts and mowing equipment. The turfgrass leaves will at first look and feel water-soaked, greasy, or slimy. Once dew or moisture dries up the blade will shrivel up and collapse, often causing a matted brown turf. The turfgrass will begin to develop patches that fade to a light brown or gray color. With high humidity in early morning or throughout the day, diseased leaves may be covered with the white, cobwebby, mold-like growth of mycelium.<\/p>

Biology<\/h3>

Pythium may survive in the soil for extended periods of time, often coming from debris from past infected plants or spores living in the soil. Pythium spreads by the movement and growth of mycelium and spores\u00a0from plant to plant. Pythium thrives in hot and humid weather typically day temperatures of 27\u00b0C to 35\u00b0C in areas that have little air movement but high moisture content. In lower temperatures of 13\u00b0C to 18\u00b0C and extended periods of wet weather Pythium is still prevalent.<\/p>

Pythium will most commonly appear during the\u00a0\u201c150 rule\u201d, which is when day + night temperatures are over 66\u00b0C. Pythium is most common when dew remains on the grass blade for 14 hours or more. Turf stands that have excess nitrogen and lush growth are very vulnerable to Pythiuum and will spread rapidly due to high nitrogen levels.\u00a0Alkaline<\/a>\u00a0soils (above a pH of 7) and\u00a0calcium<\/a>\u00a0deficient soils also tend to favor Pythium.3 Pythium survives overwinter as\u00a0oospores<\/a>\u00a0found in the soil. The pathogen, therefore, is easily spread with the movement of diseased plants, soil movement, surface water, or even from shoes. Pythium also causes \u201cDamping off\u201d, \u201cseed decay\u201d, or \u201cseedling blight\u201d of turfgrasses. This is most common in Perennial ryegrass (Lolium perenne<\/a>) and happens in areas that are high above the recommended seeding rates. Not only does Pythium devastate the Turf canopy but the oomycete can also attack the roots and crowns, which will reduce growth, become off-colored, and cause thinning of turf.<\/p>

Conditions<\/h3>