![]() ![]() Alkaline soils (above a pH of 7) and calcium deficient soils also tend to favor Pythium.3 Pythium survives overwinter as oospores found in the soil. Turf stands that have excess nitrogen and lush growth are very vulnerable to Pythiuum and will spread rapidly due to high nitrogen levels. Pythium is most common when dew remains on the grass blade for 14 hours or more. Pythium will most commonly appear during the “150 rule”, which is when day + night temperatures are over 66☌. In lower temperatures of 13☌ to 18☌ and extended periods of wet weather Pythium is still prevalent. Pythium thrives in hot and humid weather typically day temperatures of 27☌ to 35☌ in areas that have little air movement but high moisture content. Pythium may survive in the soil for extended periods of time, often coming from debris from past infected plants or spores living in the soil.Pythium spreads by the movement and growth of mycelium and spores from plant to plant. With high humidity in early morning or throughout the day, diseased leaves may be covered with the white, cobwebby, mold-like growth of mycelium. The turfgrass will begin to develop patches that fade to a light brown or gray color. Once dew or moisture dries up the blade will shrivel up and collapse, often causing a matted brown turf. ![]() The turfgrass leaves will at first look and feel water-soaked, greasy, or slimy. Pythium often develops into these streaks because it is the direction of water movement (drainage) most often ruts from golf carts and mowing equipment. Pythium symptoms will first appear as small, irregularly shaped spots, which will join together to form large patches that will often be long streaks. Under favourable conditions, the whole turfgrass could be destroyed within a few days. ![]() Cool-season turfgrasses are susceptible to Pythium. The disease Phytium blight, also known as Cotton Blight, Grease Spot is caused by several different Pytium species. ![]()
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