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Pythium Root Rot

Pythium root rot occurs at any point in the growing season when the soil remains saturated for prolonged periods of time, such as several days or weeks. This can be a result of poor surface or subsurface drainage, over-irrigation, heavy rainfalls, and excessive thatch and organic matter accumulation.  The turfgrass can appear orange or yellow from a distance, often in irregular patterns or occasionally as distinct patches. Often the symptoms spread along drainage patterns. On individual plants, the crowns, roots, rhizomes and/or stolons will appear dark and greasy. The depth and density of the roots will be drastically reduced in affected areas.