Which of the following diseases is known for creating circular patches in turf?

The disease known for creating circular patches in turf is Fairy Ring. This fungal disease typically appears as rings or arcs of dark green grass in the lawn, surrounded by a band of yellow or brown grass. The circular patches are a direct result of the way the fungus grows, as it expands outward in all directions from a central point. Over time, the grass in the center may die off, enhancing the visibility of the circular pattern.

Fairy Ring can also lead to nutrient imbalances in the soil, which can further contribute to the distinct ring appearance. The unique growth pattern and aesthetic impact it has on lawns make it identifiable among turf diseases.

The other diseases listed, such as Gray Leaf Spot, Brown Patch, and Rust, do not typically manifest as circular patches. Gray Leaf Spot often appears as lesions or spots on leaf blades, Brown Patch usually presents as irregularly shaped, brown areas, and Rust is characterized by yellow-orange pustules on grass blades. Understanding these characteristics helps in recognizing and diagnosing turf diseases accurately.