Some lawns are affected almost every year, while others are damaged only occasionally. Fungicide application should be made when brown patch is expected. On lawns where brown patch occurs occasionally, apply fungicide when the disease first appears. Symptoms of this fungal disease appear as irregular patches ranging in size from two to several feet in diameter. Infections on leaves appear as small, olive green spots which enlarge to form dark blotches.
Infected leaves die and fade to a light tan color.
The entire plant is killed when the root rot phase of this disease develops. The disease-causing fungus overwinters in thatch at the base of the plant and acts as a pathogen when weather conditions favor its development during the growing season. Chemical fungicides are effective in control. The disease appears as round, brown or bleached spots the size of a silver dollar or slightly larger. Lesions may be seen on the edges of leaf blades.