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Powdery Mildew


What is Powdery Mildew?

Powdery mildew fungi are found on many native plants, cultivated crops, ornamentals, and turfgrass species. In general, it is not considered to be a serious disease on turf.

Why do you have Powdery Mildew?

Severe outbreaks of Powdery Mildew on Kentucky bluegrass tend to occur on turf growing in shaded areas during the late spring or mid-fall when moderate temperatures and relative humidity is high.

What can you do about Powdery Mildew?

To help protect you lawn from Powdery Mildew we recommend:

  • Don't water more than every 3-4 days...only in the morning
  • Reduce the amount of shade by trimming trees to let more light in
  • Seed with Turf Type Tall Fescue, which can be more resistant to Powdery Mildew than Kentucky Bluegrass. (Super Seed can really help)
  • Core aerate and apply liquid aeration to help water reach the roots
  • Topdress with compost to help provide soil biology to compete with the fungus that causes Powdery Mildew