Copper Spot / Zonate Leaf Spot

Also known as: Zonate leaf spot

Pathogen: Gloeocercospora sorghi, Microdochium sorghi

Identification

Symptoms

Scattered salmon-to-copper circular patches 1-3 inches wide
Small red-brown leaf lesions can coalesce
Most noticeable on high-quality bentgrass surfaces

Season: Jun, Jul, Aug
Regions: All Regions
Turf Hosts: Bentgrass, Bermudagrass, Zoysiagrass

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Sources

This is identification help, not a diagnosis. Symptoms described here can overlap between diseases and other causes (drought, wear, nutrient deficiency). When you're not sure, or before applying any treatment, contact your state's Cooperative Extension office - most offer free or low-cost diagnosis and know your local conditions best.