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Pythium Blight Also called cottony blight, can appear
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Pythium Blight

Also called cottony blight, can appear to come out of nowhere during hot, humid weather. It can be identified by a telltale slimy or greasy water-soaked lawn and the presence of patches that are less than 6 inches in diameter. To help prevent pythium blight, avoid mowing moist grass, don't cut too short, water only in the morning and apply a balanced fertilizer (not a high-nitrogen product). Check the soil's pH and maintain a level in the neutral to slightly acidic range. (Credit: William M. Brown Jr., Bugwood.org)

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