Summer Patch

Some signs of Summer Patch include…

  • Patches of wilted, dark green grass that quickly turns brown.
  • Matted light-tan areas of dead turf.
  • Roots that are dark and partially rotted.
  • Presence of a “Frog-eye” pattern which is a patch of green healthy grass growing in the center of a larger brown dead patch.


Did you know that:

  • Summer patch is one of the most destructive diseases of Kentucky Bluegrass.
  • It is a soil-borne fungus that infects the roots.
  • It often goes undetected until the plant begins to die because it occurs underground.
  • The disease is most prevalent following a wet spring into early summer.
  • It begins in the spring, but symptoms will appear in the summer during heat stress.
  • It is common on sunny sides of slopes and areas that heat up quickly, such as along edges of roadways, driveways, sidewalks, etc.

Some cultural ways to control summer patch…

  • Mow at the highest recommended height for your grass type.
  • Irrigate deeply and less frequent to encourage deeper root development.
  • Fertilize lightly with a slow release fertilizer.
  • Keep thatch buildup to a minimum – dethatch if there is more than 1/2″.
  • Aerate to relieve compaction.
  • Maintain a balanced fertility.