Newark, DE
(302) 731-1075
West Chester, PA
(610) 344-9234
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Symptoms: Rings or patches of blighted turfgrass that measure 5” to 10’ in diameter. Leaf spots and “smoke rings” – thin, brown borders around the diseased patches that appear most frequently in the early morning.
Conditions favoring disease: Active at cool temperatures in the spring and fall (over 85* during the day and over 60* at night). Occurs in areas that experience extended periods of wetness.
Symptoms: Sunken, circular patches that measure several inches. Patches turn from brown to straw color and may eventually coalesce, forming irregularly shaped areas. May display small lesions that turn from yellow-green to straw color with a reddish-brown border. Lesions can extend the full width of the leaf and many times will appear in the shape of an hourglass.
Conditions favoring disease: Continuous high humidity at temperatures between 59* to 86*. Favored by warm days, cool nights and intense dews. Infects areas with low levels of nitrogen. More severe in dry soils.
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Symptoms: Symptoms vary with causal agents. Aboveground mushroom and puffball basidiocarps may or may not occur. Typically has outer rings that are either dark-green or brown in color. Shape and size of rings vary depending on the species. Activity in turf ceases when the individual rings come in conact with each other.
Conditions favoring disease: Typically occurs in the summer. Can also occur on cool-season turfgrass in mild winter climates.
Symptoms: Purplish-brown to black spots with tan centers on the leaf blade and sheath. Lower leaves of infected plants become shriveled and blighted. In severe cases, almost all of the leaves and tillers die. Typically follows the appearance of leaf spots on cool-weather turfgrass.
Conditions favoring disease: Temperatures between 40* and 80* Areas with 10 hours a day of foliar wetness for several consecutive days. High amounts of nitrogen and a low mowing height.
Symptoms: First appears on the leaves as individual tufts of fine, white mycelium. The tufts enlarge and coalesce, causing the leaves to have a grayish-white or powdery appearance. Severely infected turf turns yellow, then tan and brown in color. Stressed turf that is severely infected can die. Severely infected turf in shaded areas can become thinned.
Conditions favoring disease: Typically occurs in the summer. Can also occur on cool-season turfgrass in mild winter climates.
Symptoms:Appears suddenly during hot, humid weather. Greasy, brown circular spots that are initially ¾” to 2” in diameter. Rapidly enlarges in size. Water soaked and dark colored early in the morning. Forms fluffy white masses of fungal mycelium (cottony blight) and can coalesce to form large, irregular areas of dead turf. Infected patches may appear bronzish on color.
Conditions favoring disease: Conditions favoring disease: Found in areas with poor drainage and air circulation as well as in locations that are high in salinity or nitrogen. Favors night temperatures over 68*. Occurs in areas that experience more than 10 hours a day of foliar wetness for several consecutive days.
Symptoms:Patches that are reddish-brown in color and 1”-4” in diameter up to 2’. Causes a gelatinous mass of pink mycelium with water soaked leaves.
Conditions favoring disease: Temperatures between 40* to 85* and in locations that are low in nitrogen. Areas that experience more than 10 hours a day of foliar wetness for several consecutive days.
Symptoms: Light yellow flecks initially on the leaf blades and sheaths. Flecks enlarge, elongate and turn yellow in color. Infected areas rise above the epidermis and then rupture, releasing spores that are yellowish-orange to reddish-brown in color. Leaf blades turn yellow, starting at the tip and progressing to the base sheath. Severe disease infection can cause the shoot to turn yellowish to reddish-brown in color and slow in growth. Turf may appear thin as individual shoots die.
Conditions favoring disease: Typically occur in the early spring through fall, depending on the location of the turf. Favors low light areas. Depending on the species, rusts favor temperatures between 65*-86*F. Severe rust infections occur on slow-growing turfgrass, particularly those with low nitrogen levels and/or plant water stress.