Dollar spot infects all species of warm and cool season turfgrass.
Dollar spot affects small, circular areas of turf, about 1 to 5 inches in diameter. Spots may merge to form large, irregular areas. Leaves appear water-soaked initially, then brown and often exhibit a reddish band extending across the leaf. Sometimes in early morning mycellium can be seen and resemble small spider webs.
Developing Condition
Dollar spot is favored by temperatures between 59°F to 86°F and continuous high humidity. This disease is particularly favored by warm days, cool nights, and intense dews. It also infects areas with low levels of nitrogen and becomes more severe in dry soils.
Control
The addition of nitrogen fertilizer is usually sufficient to stop disease activity.