Which symptom is associated with brown patch disease?

Which symptom is associated with brown patch disease?

• A. Large circular or irregular patches with tan to straw-colored turf and a visible ring of unhealthy tissue at the edge.
• B. Yellowing blades with stippling.
• C. Tiny tan to straw-colored spots with a boat-shaped lesion and a yellow halo.
• D. Galled, swollen roots.

Answer: (A)

Brown patch shows up as large circular or irregular patches of turf that turn tan to straw color, with a distinct ring of unhealthy tissue at the outer edge as the patch expands. That donut-like pattern happens because the fungus kills tissue at the advancing edge while the center may remain lighter or stressed. This disease is favored by warm, humid conditions and leaf wetness, especially from overnight dew and irrigation, so wet, summer evenings often bring it on. If you’re managing it, focus on cultural practices that reduce overnight moisture and improve air movement, and apply fungicides as needed based on spray programs. The other descriptions point to different issues—one describes general yellowing with stippling from other pests or stresses, another notes tiny tan spots with boat-shaped lesions and a yellow halo, and the last describes root galls—none of which are the characteristic patching pattern of brown patch.

Brown patch shows up as large circular or irregular patches of turf that turn tan to straw color, with a distinct ring of unhealthy tissue at the outer edge as the patch expands. That donut-like pattern happens because the fungus kills tissue at the advancing edge while the center may remain lighter or stressed. This disease is favored by warm, humid conditions and leaf wetness, especially from overnight dew and irrigation, so wet, summer evenings often bring it on. If you’re managing it, focus on cultural practices that reduce overnight moisture and improve air movement, and apply fungicides as needed based on spray programs. The other descriptions point to different issues—one describes general yellowing with stippling from other pests or stresses, another notes tiny tan spots with boat-shaped lesions and a yellow halo, and the last describes root galls—none of which are the characteristic patching pattern of brown patch.