Affected areas die and the spots may merge to form larger, irregular patches. In coarse textured grass that is cut high, the dead spots are larger and more diffuse. Leaf blades have light tan spots with reddish-brown margins that develop across the leaves. Early in the morning you may be able to see a spiderweb-like growth of the fungus over the infected area. Dollar spot most commonly occurs on bermudagrass, zoysiagrass, bentgrass, fescue and ryegrass.
Dollar spot is most active from late spring through fall.
These conditions result in heavy dew forming on the grass. Prevent thatch buildup and remove excess thatch. Avoid drought stress by watering the lawn deeply, and thoroughly when needed, timing irrigation for early morning. Remove morning dew if possible by mowing or irrigating the lawn. Always apply all chemicals according to directions on the label.