Symptoms of Pythium Blight in Warm-Season Grass: Warm-season grasses, like Zoysiagrass and Bermudagrass, will develop small black or purple spots that can grow into large, irregularly shaped patches. The patches develop in hot, humid weather. The spots can grow from an initial diameter of about 1 to 2 inches to about 1 foot wide. Symptoms of Pythium Blight in Cool-Season Grass: In cool-season grasses, like perennial ryegrass and Kentucky bluegrass, Pythium blight emerges as small recessed, circular patches. Warm-season grasses are more resistant but can still be infected. Cool-season grasses are more vulnerable to Pythium blight. Your grass type determines your lawn’s susceptibility to Pythium pathogens. Treat your lawn immediately if it is showing signs of or has tested positive for Pythium parasites. These patches mark the beginning stages of the disease, and they can spread quickly and kill the grass. The first symptom of Pythium blight you’re likely to notice is patches of grass that look water-soaked or greasy. Patches of yellowing or dead, brown grass.Grass blades covered with a cottony white or gray material, especially in the morning when the grass is wet from the preceding night’s rainfall.Grass that feels oily when you touch it (wash your hands after contact).Grass blades that appear drenched or waterlogged.Small, sunken circles on the grass with dark green, black, or purple spots.Symptoms of Pythium blight in your lawn include: Regardless, they can be devastating for your grass. While they behave like fungal lawn diseases, these organisms are not actually classified as fungi. Pythium blight is a plant disease caused by parasitic organisms from the genus Pythium. What is Pythium Blight? Photo Credit: NC State Cooperative Extension ![]() What Causes Pythium Blight to Infect a Lawn?.
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