Zoysia Decline

Grass Affected

Zoysiagrass, especially manilagrass (Zoysia matrella) and bermudagrass

 

Diagnostic Description

  • A root infecting pathogen that typically is seen following scalping during cloudy, overcast days especially with high relative humidity or moisture.
  • Circular patches form up to 20-inches in diameter which may coalesce to form larger, irregular shapes. Patches typically are initially light-brown, later turning darker.

 

Conditions Favoring Infestation and Typically Yearly Occurrence

Extended cloudy, overcast, warm days with high relative humidity especially in alkaline, droughty soils with excessive thatch accumulation. Late spring through early fall.