This is a leaf spot that produces small spots 2 to 6 inches diameter in affected turf. Dollar spot usually occurs in late spring through fall.
Symptoms
Leaf spots are hour-glass-shaped, extend across the blade with bleached centers and brown, purple or black borders. Early in the morning cottony fungal growth can be seen on infected blades. Bluegrass, ryegrass, and fine fescues are hosts, especially in poorly nourished turfs. Plants are rarely killed, primarily a leaf blight.