![]() ![]() Pythium aphanidermatum forms the gray mycelium or fruiting bodies Once the infected grass dries, the disease becomes less visible and yellow patches appear where the greasy shapes were. The mycelium it most abundant when infected areas are wet. In the morning, a white, cottony growth (mycelium) may be visible on the patches. The patches exhibit a dark brown or black water-soaked appearance, which may resemble a grease spot or irregularly shaped blotches. Pythium blight appears initially as circular, small patches, usually measuring one to three feet in diameter. ![]() Identifying Pythium blight early is crucial for effective pythium blight control. Mycelium, the gray mold created by pythium aphanidermatum can survive in soil as well as on dead or cut grass blades. The lawn disease often grows in lines following paths where water drainage occurs, or in a lawn's mowing pattern. Disease may occur in small patches or involve large areas, especially on highly maintained golf course greens.Įven though there are many pythium species, pythium aphanidermatum is the primary species associated with pythium diseases in the US. ![]() When the roots and crowns are attacked, the disease is called Pythium root rot. Many pythium species cause diseases of roots, crowns, and/or foliage that result in a general decline of turfgrass stands. This turfgrass, however, can plague commercial or residential landscapes. This lawn disease is harshest on immature grasses and seedlings and is not as commonly found in home lawns. Pythium blight appears suddenly during hot, humid weather and is common in the wettest areas and in the surface drainage pattern. Once the disease establishes, the lawn fungus spreads rapidly, leading to extensive damage.Įarly fall through late spring are times when pythium blight is more common in the south. These pathogens can persist in the soil and thatch layer, waiting for favorable conditions to attack the turfgrass. The pathogens, Pythium SPP., thrive in warm and wet conditions, making them particularly prevalent during periods of highly humid or hot humid weather with excessive moisture. The lawn fungus Pythium blight occurs mostly in cool season grass types, such as tall fescue, creeping bent grass or perennial rye grass however, it can also impact warm-season grass types like Bermudagrass or Zoysia. If left untreated, it can spread rapidly, causing extensive damage to your turf. Excessive moisture, poor drainage, overwatering, and compacted soil are contributing factors that create an environment that is conducive for pythium blight development. It is a common lawn disease that thrives in hot and humid climates, typically appearing during periods of high humidity with daytime temperatures above 86 degrees and night temperatures above 68 degrees. Pympythium blight is caused by the fungal pathogen Pythium spp., and is also known as cottony blight or grease spot. We hope this information is useful in helping you keep a healthy lawn. We will delve into the details of this fungal disease - its symptoms and best practices to eradicate this destructive fungus from your lawn. It is important to control Pythium blight, as it can quickly turn your green, lush lawn into a brown, diseased mess. That is our goal with our lawn fungus services, and we want the same for you. Pride in Turf understands how important a well-manicured lawn is to many homeowners. ![]()
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