On individual blades of grass, regardless of how the turf is managed, the symptoms start as a yellowish spot. This spot then becomes watersoaked, and later bleached or straw-colored. The edges of the spots are generally tan to reddish-brown. On most grasses, the spots usually reach across the entire leaf blade, so that they look like a band across the blade. There can be several spots on one blade and they may cause the entire blade to shrivel and die.
Spots can start at the cut end of the blade and grow down.
In the early morning, when the grass is moist from dew, the fungus may be visible. A white cottony, cobweb-like growth is present until the grass dries. The early spots may look similar to those caused by red thread. Some red fungal growth is always visible when the red thread fungus is present. Maintain adequate to high nitrogen and potassium levels in the soil.