1. Pythium blight

2. Pythium blight
Foliar blight is one phase of disease caused by Pythium spp.
Pythium spp. also causes seedling blight and root rot

3. Pythium blight Conditions: Hosts:
Day time temperatures >32 oC (90 oF)
Night temperatures >20 oC (72 oF)
Rainy, humid (>90% RH) weather
Hosts:
All cool season turf grasses

4. Pythium blight
Watersoaked, dark spots

5. Pythium blight
Light to reddish brown as turf dries

6. Pythium blight
Pattern reflecting mowing when wet

7. Pythium blight

8. Pythium blight or brown patch?
In creeping bentgrass green
Pythium blight or brown patch?

9. Matted grass with fishy odor and greasy feel (“grease spot”)
Pythium blight
Matted grass with fishy odor and greasy feel (“grease spot”)

10. Cottony mycelium (“cottony blight”)
Pythium blight
Cottony mycelium (“cottony blight”)

11. Pythium blight Control strategies Reduced leaf moisture Thatch removal
- Improved soil drainage
- Infrequent irrigation in early morning
Thatch removal
Balanced fertilization
Preventative fungicides