Anthracnose is a variety of turfgrass diseases caused by Colletotrichum cereale. Anthracnose affects annual bluegrass and creeping bentgrass throughout the United States, although it occurs most often in the midwestern and northeastern states. Anthracnose damage in these areas occurs from April through November.
Identifying Anthracnose -
Signs of Anthracnose in your lawn include irregular shaped patches forming that are yellow to brown in color. Lesions on the turfgrass leaves that are yellow with black centers may also occur. Additionally, the infected grass shoots are easily detached. In some cases of Anthracnose, dead foliage and stems can become covered with black fruiting bodies that require magnification to identify.
Anthracnose can cause the base of the stem to rot from late winter through fall. When affecting annual bluegrass, these kinds of turfgrass diseases are most often found on golf course fairways and greens.
Conditions for Anthracnose Infection -
Anthracnose can only lead to an infection in your lawn if all of the following conditions are present:
1. Pathogen – Anthracnose (Colletotrichum cereale)
2. Host – Annual bluegrass and creeping bentgrass
3. Environment – Warm, moist areas with temperatures in excess of 78 degrees Fahrenheit and with 10 or more hours of moisture on the grass per day
Cultural disease control practices create favorable conditions for a healthy lawn, and often create unfavorable conditions for the growth of Anthracnose. Environmental conditions cannot be changed, but cultural practices performed by the homeowner can be modified to lessen the chance of extensive damage from Anthracnose. Scotts LawnService can help determine a plan for preventing and controlling Anthracnose in your lawn.
For Anthracnose control and treatment, Scotts recommends the following cultural control tips: