Brown patch forms large, uneven circles with a gray-to-brown coloration. Bermuda, Fescue and Zoysia grasses are susceptible.
Mowing height, management practices and weather conditions can cause Zoysia Brown Patch, especially in the Mid-South area. Applying too much fertilizer can cause this fungus.
Dollar spot presents with a small, patchy spotting as the grass dies off and ranges in color from tan to straw. Usually, the reason is low nitrogen in the soil. Bermuda and Fescue are susceptible.
Fairy rings tend to create dark green circles in the lawn, which are caused by fungus in the thatch layer of the grass. All grasses are susceptible.
Powdery mildew has the appearance of lime dustings on grass. Too much shade and fertilizer in a damp area as well as not enough air circulation produces this mildew. Bermuda grass and Zoysia grass are affected.
Rust presents with a rust-to-orange coloration due to spores that build up on the blades of grass. This disease favors warm, damp weather where the grass does not dry out during periods of long lasting dew (up to 10 hours, particularly during overcast and damp days). Any contact in moving through the infected areas spreads the spores. Proper fertilization and frequent mowing can help. Bermuda is affected, but Zoysia is most susceptible.
Spring Dead Spot
Spring dead spot appears in the spring as small, circular dead areas of Bermuda grass 6-inches to several feet in diameter.
This disease occurs in the spring as Bermuda grass resumes growth from winter dormancy. The Bermuda grass roots and stolons in affected spots appear dark and rotted.The grass recovers very slowly during summer months while stolons creep in from the border of affected areas.
Bermuda grass stolons that grow into the affected areas usually produce short, stubby roots. The dead spot can only be treated when active. The applications must begin in late summer or early autumn when the fungus is believed to be active.