Which of the following statements is true regarding brown patch?

Brown patch is indeed a turfgrass disease caused by the fungus Rhizoctonia solani. This disease primarily affects cool-season grasses, particularly during warm, humid weather. It manifests as circular patches of brown grass that can spread quickly under favorable conditions, such as high moisture and temperatures. Recognizing brown patch is crucial for turf management and maintaining healthy lawns or golf courses.

The other options do not accurately represent brown patch. It is not a type of weed, as weeds are typically unwanted plants that compete with grass for nutrients and resources. Brown patch does not improve soil quality; instead, it indicates a problem within the turf that may require intervention. Lastly, it is not beneficial for grass growth; rather, it negatively impacts the health of the turf by causing localized die-back and weakening the overall lawn or course. Understanding the nature of brown patch helps in implementing effective management practices to mitigate its effects.