The wet warm weather through the midsection of the United States has increased the severity of dollar spot on cool season turfgrass lawns and athletic fields, especially Kentucky bluegrass.  The pathogen, Sclerotinia homoeocarpa, actively grows and infects when temperatures are between 60 and 86 F.  White mycelium is often present in the mornings when dew is present.  With morning fog becoming more frequent, this will only increase the severity and activity of dollar spot.  Symptoms on Kentucky bluegrass appear as straw colored patches normally 3 to 6 inches in diameter.  To correctly identify this disease look at the leaf symptoms.  Dollar spot symptoms appear as an hour-glass shaped bleached out lesion with a brown border along the edges.