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Understanding Brown Patch Disease in Lawns: Symptoms, Causes, and Treatments

Brown patch disease is a fungal issue that affects various grasses, notably Bermudagrass, Zoysiagrass, and St. Augustinegrass. Key symptoms include distinct boundaries between healthy and diseased grass, along with rotting tissue where the shoot attaches to the stem. The causal organism is Rhizoctonia mycelium. Control measures involve effective fungicides like PCNB, Benomyl, and Daconil, which have been rated for their effectiveness. This guide aims to help lawn care professionals and homeowners recognize and manage brown patch disease to maintain healthy lawns.

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Understanding Brown Patch Disease in Lawns: Symptoms, Causes, and Treatments

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  1. Brownpatch Brownpatch in bermudagrass lawn

  2. Brownpatch in zoysiagrass lawn

  3. Brownpatch in St. Augustinegrass

  4. Brownpatch symptoms distinct boundary between healthy and diseased grass

  5. Brownpatch symptoms showing rotted tissue where shoot attaches to stem

  6. Closeup showing rotted shoot tissue

  7. Rhizoctonia mycelium Causal organism for brownpatch

  8. Brownpatch in St. Augustinegrass Rate of A.I./ *Ratings for Brownpatch Activity Fungicide1,000 sq. ft.11/25/85 11/11/86 11/6/97 11/30/88 3/9/89 PCNB 12 oz. 1.0 1.0 1.3 1.0 1.3 Benomyl 2 oz. 7.3 6.7 Chipco 26019 2 oz. 4.0 5.2 5.3 2.0 4.2 Daconil 4 oz. 8.0 5.2 4.0 Prostar 2 oz. 1.0 1.7 1.5 3.5 Banner 2 oz. 2.0 3.5 Check 9.0 8.0 8.3 4.0 8.0

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