Pythium Blight
Also known as: Grease spot, Pythium leaf blight
Pathogen: Pythium spp.
Identification
Symptoms
- Rapidly spreading greasy or water-soaked patches
- Matted turf following drainage or traffic patterns
- White cottony mycelium may appear during humid mornings
- Season
- Jun, Jul, Aug, Sep
- Regions
- All Regions
- Turf Hosts
- Bentgrass, Annual Bluegrass, Perennial Ryegrass
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This is identification help, not a diagnosis.
Symptoms described here can overlap between diseases and other causes (drought, wear,
nutrient deficiency). When you're not sure, or before applying any treatment, contact
your state's Cooperative Extension office - most offer free or low-cost diagnosis and
know your local conditions best.