Lawn Fungus Signs and Proven Cures

UCANR Publication 8006. Harivandi A, VA Gibeault, MJ Henry, L Wu, PM Geisel, CL Unruh. UCANR Publication 8035.

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Reynolds CA, ML. Flint. Nov. 2009. The UC Guide to Healthy Yards. UCANR Publication. Oakland, CA. Wong F, MA Harivandi. Sept. 2009. Diseases from UC IPM Bug Management Guidelines: Turfgrass. UCANR Publication 3365-T. Oakland, CA.: Yard Illness: Prevention and Management J. Hartin, UC Cooperative Extension San Bernardino County P.M.

M.A. Harivandi (emeritus), UC Cooperative Extension Alameda County.

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New Turf Threats to Watch for in 2026

Susceptible grasses: Tall fescue, perennial ryegrass, Kentucky bluegrass, bentgrass, St. AugustinegrassSymptoms: Circular patches of dark green turf that turn brownMost common in damp summer season conditionsBrown Spot is a typical lawn disease brought on by Rhizoctonia solani fungi, which thrives in hot, damp weather condition. It impacts a range of warm-season lawns, consisting of high fescue and perennial ryegrass, causing large, circular patches of dead lawn that can be several feet in diameter.

Improve drainage and increase air circulation by aerating the soil. Applying fungicides preventatively in high-risk locations can assist manage outbreaks. Executing correct insect management practices is necessary to avoid the spread of this turfgrass illness. Susceptible lawns: Bermudagrass, Kentucky bluegrass, perennial ryegrass, high fescue, ZoysiagrassSymptoms: Yellow-orange flecks on leaf blades that turn into rust-colored sporesCommon in humid conditions and especially affects ryegrassYard Rust is a fungal lawn illness that specifically targets ryegrasses which triggers yard blades to turn yellow-orange and establish rust-colored spores that can rub off on shoes or lawn equipment.

While unsightly and an annoyance, it is actually not hazardous for your yard. Appropriate fertilization motivates energetic growth, assisting the lawn recuperate.

Conditions that prefer its advancement consist of cool, wet weather condition followed by warm temperature levels. If left unattended, it can progress to melting out, triggering spots of dead yard. Service: Adjust watering and cutting practices to prevent excess moisture on leaves. Lower nitrogen application and enhance soil drainage to discourage fungal development.

It is more common in cool-season turfs throughout durations of high humidity.

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Curing Diseased Grass Fast

Thinning out thick plantings and increasing sunshine exposure can lower mildew intensity. Using fungicides might be needed in relentless cases. Ensuring that prone lawns get adequate sunlight can assist avoid this disease.