Pythium - Foliar Blight

Pythium ultimum, Pythium aphanide rmatum and others  pythium sp 

Symptoms
Circular reddish-brown spots ranging from 2.5 - 15cm (one to six inches). In the morning, blades appear water-soaked (grease spot), dark, and may feel slimy. Mycelium may also be present. When dry, blades shrivel and appear reddish-brown. Infected blades collapse quickly. Turf may appear streaked.

Turfgrasses Affected
All cool season turfgrass

Occurrence
Summer, during hot humid weather
Day temperatures exceed 30C
Night temperatures exceed 22C

Control Options
- Improve soil drainage
- Increase air circulation
- Reduce heavy watering
- Suspend nighttime watering when conditions conducive to disease
- Keep nitrogen levels low
- Minimize thatch buildup

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