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Lawn Diseases

Herbi-Systems offers fungicide treatments for most lawn diseases. If you believe your lawn has a fungus or disease, please contact our office. We will dispatch a manager for an on-site diagnosis. Below, you will find common lawn diseases listed alphabetically with descriptions.

Brown Patch

Brown patch forms large (several feet) uneven circles with a gray-to-brown coloration. Centipede, St. Augustine, Bermuda, rye, Fescue, bent, and Zoysia grasses are susceptible.

Dollar Spot

Dollar spot presents with a small, patchy spotting as the grass dies off and ranges in color from tan to straw. A general occurrence near the coast and on soil that is low in nitrogen, dollar spot can be found in Bermuda, bent, blue, Fescue and rye grasses.

Fairy Ring

Fairy ring has a totally different look characterized by the appearance of a darker green amid unaffected grass and also surrounds an inner-cobwebbed dead grass. Applying water under the fungus with constant mowing will help remove some of the webbing. All grasses can be affected.

Fusarium Patch

Fusarium patch (pink snow mold) develops under snow or at the edges of melting snow. A pinkish tinge can be seen in the early morning with thread-like fungi and white or pinkish spores of a gel type substance. The grass blades turn brown and clump together. Fescues, Zoysia, rye grass, bent grasses are affected.

Irrigation System Damage

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Leaf Spot

Leaf spot can be readily seen on the leaf blade. It has a straw color inside with purple shading on the outside. Grasses affected are blue, Fescue and Bermuda grasses.

Necrotic Ring Spot

Necrotic ring spot is similar to summer brown patch and forms frog-eyed spotting with a reddish purple color. This disease grows on the grass but is not seen until the warmer, dryer months of summer.

Powdery Mildew

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. Bluegrass, Bermuda, and Zoysia are affected.

Red Thread

Red thread begins with what appears to be water spots on the leaf. Next, the blades turn a light brown color. Finally, the fungus makes thin, thread-like attachments at the tips of the blades. Red Fescue, blue grass, rye, and bent grasses, 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. Disinfect your mower to prevent reoccurrence. Blue grass and rye grass are most affected.

Spring Dead Spot

Spring dead spot appears 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.

Stripe Smut

Stripe smut appears as a dark coloration on the blades with bright green leaves that will eventually curl up and die. Blue grasses and bent grasses are affected.

Summer Patch

Summer patch (fusarium blight) appears as green growths in the middle of dead brown patches. This fungus prefers the hot, drier weather and alternating wet to dry periods. As a preventive measure, keep the grass properly watered during the drier season. Bent, tall fescues, blue grasses and perennial rye grass are affected.

Zoysia brown patch

Zoysia Brown Patch

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