Signs of fairy ring include a dark green circle or arc of rapidly growing turfgrasses, sometimes lined with a band of dead grass. Occasionally, mushrooms or puffballs form along the ring. Fairy rings develop most commonly in spring and fall when there is excess moisture.
Gray snow mold is a fungal disease that attacks turfgrass in areas where there are extended periods of snow cover. It is easier to manage if treated in a timely manner but can be fatal to turfgrass if left untreated.