Snow Mold on Turf Grass.
Gray Snow Mold is common in lawns with snow cover over unfrozen soil. North facing lawns are at highest risk as extended periods of snow covers the lawn melting then freezing while snow continues to accumulate. Symptoms if not spotted during winters end can be easily seen during spring snow melt. Lawns will have a greyish tint and a matted down appearance. There may also be a light mycelium cover over the area affected. Pink Snow Mold is very similar to grey snow mold however