Which symptom distinguishes dollar spot from brown patch?

Which symptom distinguishes dollar spot from brown patch?

• A. Dollar spot shows tiny tan spots with a boat-shaped lesion and a yellow halo; brown patch shows large patches with ring of unhealthy tissue.
• B. Brown patch shows yellow halo.
• C. Dollar spot shows galled roots.
• D. Brown patch shows stippling.

Answer: (A)

Distinguishing these diseases comes down to the size and edge of the spots on the turf leaves. Dollar spot appears as small tan spots on the leaf blades, and a hallmark is the boat-shaped lesion often surrounded by a narrow yellow halo. Brown patch forms much larger patches that expand across the turf, with a ring of unhealthy tissue at the outer edge as the patch grows. The other options don’t fit these patterns—dollar spot is not known for root galls, and stippling isn’t a typical feature of brown patch. Recognizing the small, haloed lesions versus large expanding patches helps you identify which disease is present and choose appropriate management actions.

Distinguishing these diseases comes down to the size and edge of the spots on the turf leaves. Dollar spot appears as small tan spots on the leaf blades, and a hallmark is the boat-shaped lesion often surrounded by a narrow yellow halo. Brown patch forms much larger patches that expand across the turf, with a ring of unhealthy tissue at the outer edge as the patch grows. The other options don’t fit these patterns—dollar spot is not known for root galls, and stippling isn’t a typical feature of brown patch. Recognizing the small, haloed lesions versus large expanding patches helps you identify which disease is present and choose appropriate management actions.