Which type of fungi is commonly associated with turf diseases?

Pathogenic fungi are the correct choice because they consist of organisms that are specifically responsible for causing diseases in various plant types, including turfgrass. These fungi are harmful and can lead to a variety of turf diseases such as brown patch, dollar spot, and powdery mildew, which can significantly affect the health and appearance of lawns and sports fields.

While mycorrhizal fungi and beneficial fungi play essential roles in promoting plant health and nutrient uptake, they do not cause diseases; instead, they help improve soil health and plant resilience. Ascomycetes, a specific group of fungi, include both pathogenic and beneficial species, but the term is too broad to indicate a direct association solely with turf diseases. In summary, pathogenic fungi are the main group linked to causing detrimental effects on turf, making them the most relevant answer in this context.