The causal fungus usually invades the leaves but may also damage the crown, causing deep scars in the turf. Following a heavy dew, the white web-like mycelium of the fungus may be found on the diseased turf. This mycelium quickly disappears as the leaves dry. Mycelium of other fungi or small spider webs are often confused with the mycelium of this fungus. Wet and mild conditions within the turf canopy favor growth of the fungus.
Infection occurs when fungal mycelium comes into contact with a healthy leaf.
Dollarspot is more of a problem on drought-stressed turf. Lawns receiving adequate amounts of water are less susceptible to damage. Low cutting heights and low nitrogen fertility will increase the severity of dollarspot on zoysiagrass and bermudagrass. Fog, dew, or watering will provide enough moisture for the disease to develop. Control Measures Maintaining recommended nitrogen fertility levels for good turf growth is often an effective control for dollarspot.