What are the characteristic symptoms of Brown Patch in turf?

Brown Patch is a common turf disease caused by the fungus Rhizoctonia solani, and it presents distinct symptoms that are crucial for identification and management. The characteristic symptoms include irregular rings or patches of brown or tan foliage, which is a direct result of the fungal infection affecting the grass blades and roots. As the disease progresses, it causes the grass in those areas to die back, leading to the characteristic patchy appearance. The edges of these patches may sometimes exhibit a darker zone, especially during the early stages of the disease. Identifying these symptoms is crucial for appropriate disease management strategies.

The other options do not reflect the typical symptoms of Brown Patch. Dense green patches with dark tips may suggest issues other than a fungal disease, such as nutrient imbalances or different kinds of stress. Uniform yellowing of the entire lawn usually indicates broader issues like environmental stress, improper watering, or nutrient deficiencies rather than a localized fungal infection. Lastly, thick, healthy grass without discoloration does not apply to Brown Patch, as the presence of the disease inherently leads to visible damage and patchiness in the turf. Understanding these specific symptoms helps in diagnosing and managing turf diseases effectively.