Elliptical-shaped spots are surrounded by a dark purple border. Tissue in the center of the spot may turn straw-colored. If the spot extends across the leaf, the blades wither and die. As the disease progresses and temperatures warm, the fungus works its way to the plant's base and attacks roots and crowns. Basal tissues near the ground may become dark brown and rot.
Dollar spot occurs during warmer summer months.
Powdery mildew is prevalent in shady areas and areas that are sheltered from wind and air movement. The fungus appears on the leaf blades as a white talcum-like growth or substance. The following list of non-chemical control methods will promote a healthy lawn and help prevent turf disease as well as other problems. When establishing or renovating a turf area, till the soil as deeply as possible and improve soil conditions by incorporating organic matter. Fertilize to meet the nutritional needs of turfgrass, but avoid over-fertilization that stimulates lush, succulent growth.