Brown Patch in St. Augustine Grass: Identification and Fungicide Treatment

Q: What's wrong with our St Augustine grass? Noticed on this hill after several days of rain with sudden onset.

Looks like brown patch disease, Rhizoctonia solani. The orange rim is characteristic. Excess water is usually the cause.

Propiconazole (click for sources) works well to stop it.

About Gardening: Brown Patch in Cool-Season Lawns: Stop Watering, Seed Clover, Wait for Fall; Managing Brown Patch Disease in Lawns: Cultural Controls Over Chemicals; Is Your Brown Lawn Dead or Dormant? Summer Care for Maryland Grass; Organic Management of Brown Patch Disease in Long Island Lawns; Brown Patch in Fescue: Cultural Fixes Before Fungicides; Brown Bermuda Lawn: Mowing Height and Frequency Fixes; Brown Patch Fungicide Efficacy: Professional Products Ranked, Check Active Ingredients; Take-All Patch in St. Augustinegrass: Diagnosis and Management; Brown Patch Diagnosis: Is It Disease or Environment?; Brown Patch in Bermudagrass: Symptoms, Management, and Control

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