How does Summer Patch primarily present itself on affected turfgrass?

Summer Patch primarily presents itself on affected turfgrass as yellow to tan patches. This visual symptom is characteristic of the disease caused by the fungus Magnaporthe poae, often appearing during the warm months when conditions are favorable for its development. The yellowing of the grass is an early sign of stress, and as the disease progresses, these patches can become more pronounced and may expand, ultimately leading to a recognizable light tan color as the grass continues to decline.

Understanding the appearance of Summer Patch is crucial for accurate identification and management. Yellow to tan patches are indicative of the disease's impact on the turf, which typically affects the crown and roots, leading to the grass dying off in these specific areas. Recognizing the color and pattern of the patches aids in timely intervention to mitigate damage and restore healthy turfgrass. In contrast, the other options depict symptoms associated with different turfgrass issues or conditions, which may not specifically reflect the distinct presentation of Summer Patch.