![]() A mycelium starts in one spot and spreads in all directions. White mycelium grows overall leaf tissue, not just dead tissue as in dollar spot.įAIRY RING ( Marasmius oreades and others) Dark green ring with lighter green center, 2 ft to 100 ft in diameter. Leaves appear water-soaked and shiny at first, turning tan when dry. PYTHIUM ( Pythium spp.) Rounded sunken patches up to 1 foot in diameter. Dead areas appear on the turf after the snow has melted. Several different fungi are responsible for snow mold disease. ![]() SNOW MOLD ( Gerlachia nivalis and Typhula spp.) Grayish white patches up to 3 feet in diameter. The disease is more common in fescues and grows best from 60 to 70 degrees F. The grass in the patches is pink and dead and contains coral-red masses of mycelium. RED THREAD ( Laetisaria fuciformis) Pinkish patches from 3 to 15 inches in diameter develop during rainy weather. ![]() Cottony mycelium may be evident in the morning growing over dead tissue. Spots have a reddish margin and expand until they girdle the leaf blade. or Sclerotinia homeocarpa) Rounded, straw-colored, slightly sunken patches up to 2 inches in diameter on bentgrass greens, 4–6 inches in diameter on other lawns. The dark gray smoke ring is sometimes visible on lower-mowed turf.ĭOLLAR SPOT ( Moellerodiscus spp. Since most grass diseases affect leaves, patches, and rings describe certain diseases in more advanced stages of development.īROWN PATCH ( Rhizoctonia solani) Round patches of turf up to several feet in diameter appear watersoaked and eventually turn brown. The diseases have been categorized as patches (cause dead spots or patches in the lawn), rings (cause rings of dead or affected grass), or leaf blight (affect individual blades of grass, often over a wide area and no distinct patch or ring pattern may be noticeable). ![]() Following is a short description of the most common diseases to help you sort out which one may be causing your problem. Several fungal diseases attack lawn grasses. ![]()
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