Grass looks as though it is sprinkled with flour. Kentucky bluegrass and shade areas are the most susceptible. Grass will wither and die as a result.
- First appears on the leaves as individual tufts of fine, white mycelium.
- The tufts enlarge and coalesce, causing the leaves to have grayish-white or powdery appearance.
- Severely infected turns yellow, then tan and brown in color.
- Stressed turf that is severely infected can die.
- Severely infected turf, especially in shaded areas, can become thinned.
Conditional Favoring Disease:
- Temperatures between 40°F and 80°F.
- Areas with 10 hours a day of foliar wetness for several consecutive days.
- High amounts of nitrogen and low mowing height.