Fescue lawns occasionally get a fungal infection called Brown Patch. It occurs when nighttime temperatures are above 65 degrees, and there is high humidity. Symptoms include browning patches or a thinning lawn. In extreme cases, affected areas of the lawn can die. Blades of grass around the infected areas will be covered in spots or bands called lesions that are orange, tan, or brown in color. If the infection is not very heavy, the turf will usually recover once conditions are no longer favorable to the disease. Always water lawns in the morning, not in the evening so that the lawn dries out faster. Good air circulation also helps. For chemical control, a fungicide such as Fertilome’s F-Stop or Bonide’s Infuse should be applied when conditions are favorable for disease development. For brown patch, treat when temperatures are above 65 degrees at night, and there is high humidity.