A fungal disease that appears in the early spring as the snow melts. It looks like circular patches around 3”-12” in diameter of dead matted down grass. There are two species: Typhula incarnate – less severe (only infecting the leaf tissue) and infected patches usually recover quickly in the spring. Typhula ishikariensis – this infection may progress down into the crown, resulting in plant death or more severe and lasting damage.
Snow mold can be caused by extended periods of snow covering the ground that is not completely frozen. It can also occur under leaves that have not been cleaned up (fall clean ups) or with grass left too long before the winter season.
Fungicides are available but, they are not recommended due to the largely superficial and temporary damage snow mold inflicts on the lawn. Once the area has dried, the infection will cease and the turf will grow out and renew itself. To speed up the process, the infected area should be raked to encourage air-flow and eliminate dark, wet conditions that are ideal for snow mold growth.