Powdery Mildew


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.