Symptoms appear as roughly circular patches of thinned turf.
Early AM inspection may show a smoky zone on the periphery of the patch. On typically cut home lawns the symptoms may first be seen as a cottony white growth of mycelium when a heavy dew is present. These mycelium may penetrate the leaf and cause infection. In the infected stage, the symptoms appear as straw or bleached spots 4 to 6 inches in diameter that may overlap each other. At the periphery of these spots, the individual grass blades will have straw colored bands across the blades with reddish-brown borders.