What lesions are observed on the leaf sheaths of turf affected by Large Patch?

Large Patch is a turf disease caused primarily by the fungal pathogen Rhizoctonia solani. The characteristic lesions observed on the leaf sheaths of affected turf are reddish-brown oval-shaped spots. This distinct appearance is due to the specific way the fungus infects the grass, leading to the development of these lesions, which can often be surrounded by yellowing or thinning turf. This symptom is a clear indicator of the disease, helping turf managers and homeowners identify the issue early for management and treatment options. Recognizing the specific lesion type is crucial for proper diagnosis and effective control measures, which is essential in maintaining healthy turfgrass.