Problem: White Patch
This plant disease is caused by a fungus infection, usually Melanotus phillipsi or Trechispora species, and it is most common in tall fescue. White patch can also infect fine fescue and Kentucky bluegrass. It is especially prevalent during hot, wet weather toward the end of summer.
No specific control program is available for white patch. Weakened lawns in exposed, sunny sites are most susceptible, so proper planting and maintenance -including regular mowing, irrigation, and applications of fertilizer-should limit damage. Lawns often recover on their own with the return of cooler weather.