Lawn Diseases: Pythium Blight

Forecasted weather patterns will be favorable for Pythium blight to start showing up on cool-season turfgrasses. With afternoon showers and nighttime temperatures over 70, conditions will be ideal for this disease to do some damage, particularly in tall fescue. Preventative measures should be taken now before the average daily temperature gets too high for cool-season turfgrasses to recover.

Pythium blight first appears as small, sunken, circular patches up to 1 foot in diameter during hot, humid weather. Leaves within the patches are matted, orange or dark gray in color, and greasy in appearance. Gray, cottony mycelium may be seen in the infected areas when the leaves are wet or humidity is high. The disease spreads rapidly along drainage patterns and can be tracked by equipment. This disease can spread rapidly and cause severe damage to a turf stand very quickly when conditions are favorable for development.

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Source:  Pythium Blight