Diseases
All Regions
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Brown patch (Rhizoctonia solani)
Brown patch is a common summertime disease that has almost circular patches ranging from 3 inches to several feet in diameter.
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Dollar spot (Sclerotinia homoeocarpa)
This two-bit mold-affect appears in circular patches, 1-5 inches in diameter.
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Leaf spot (Dreschlera spp. and Bipolaris spp.)
Leaf spot makes your bluegrass blue, as in sad, by covering it with brown to purple lesions that can move to the crown of the plant if conditions persist.
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Necrotic ring spot (Leptosphaeria korrae)
This disease is unmistakable, with large rings, often a foot or larger, filled in with dead, brown grass.
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Pink snow mold (Microdochium nivale)
This mold grows in patches 3–8 inches wide and is ringed by a pinkish circle.
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Powdery mildew (Erysiphe graminis)
This unwelcome dusty disease appears as grayish or white growth on upper surfaces of grass leaves.
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Rust (Puccinnia spp.)
Similar to its metallic namesake, rust begins as small yellow spots on leaves and stems and develops into bubble-like pustules full of reddish spores.
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Summer patch (Magnaporthe poae)
This disease starts as a 2–3-inch, straw-colored circle and grows to large, circular or crescent-shaped patches.
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Zoysia patch (Rhizoctonia solani)
This disease appears as large patches up to 10 feet in diameter.
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Red thread (Laetisaria fuciformis)
Like the name implies, red thread appears as tangles of red, thread-like fungus in patches 2-10 inches in diameter.
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Fairy ring
This disease brings everything but the kitchen sink, being caused by more than 60 species of fungi.
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Gray snow mold (Typhula incarnata)
Gray snow mold is a patchy lawn affliction, highlighted by blotches of tan or light-gray grass, 2 inches to 2 feet in diameter, with a pink tinge around the edge.