Brown Patch

Grass Affected

All turfgrasses


Diagnostic Description

  • Occurs in somewhat circular patches, varying from a few inches to several feet in diameter. Affected areas are brownish, except for St. Augustinegrass, which usually become bleached tan or straw colored.
  • Close examination of coarse textured grasses indicate a rotting of the leaf sheath to where the entire leaf fascicles can be pulled from the plant crown.


Conditions Favoring Infestation and Typically Yearly Occurrence

Favored by excessive thatch accumulation, excessive nitrogen fertilization, frequent irrigation, poor drainage, warm temperatures (70 to 90 F), high humidity and calm winds. Symptoms are seen fall to early spring for warm-season grasses; summer for cool-season grasses.