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Pythium in turfgrass
Pythium disease, also known as "Pythium blight," "cottony blight," or "grease spot," is a highly destructive turfgrass disease caused by several different ''Pythium'' species. All naturally cultivated cool-season turfgrasses are susceptible to Pythium and if conditions are favorable to Pythium it can destroy a whole turfgrass stand in a few days or less.〔 ( Penn State )〕 Pythium favors hot and very humid weather and will usually develop in low areas or swales in the turfgrass.
== Symptoms ==
Pythium symptoms will first appear as small, irregularly shaped spots that are 1/2" to 4" inches in diameter and will join together to form large patches that will often be long streaks.〔 ( Purdue Turfgrass )〕 Pythium often develops into these streaks because it is the direction of water movement (drainage) most often ruts from golf carts and mowing equipment.〔 The turfgrass leaves will at first look and feel water-soaked, greasy, or slimy. Once dew or moisture dries up the blade will shrivel up and collapse, often causing a matted brown turf.〔 ( Cornell University )〕 The turfgrass will begin to develop patches that fade to a light brown or gray color. With high humidity in early morning or throughout the day, diseased leaves may be covered with the white, cobwebby, mold like growth of the causal fungus known as mycelium.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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