Cultural practices such as regular raking and mowing rank high on reducing snow mold in a home lawn setting during the fall. Do not be tempted to cease mowing in October when a final cut should be done in November as the grass enters dormancy. Not allowing leaf litter to accumulate or remain on the lawn as winter approaches is a great way to help minimize snow mold problems. Cut your lawn a little shorter in late fall, as low as 1.5 inches to minimize matted grass and leaves.
Aerating will help reduce compaction and maintaining a slightly acidic soil pH will also help reduce pink snow mold. Minimizing the amount of highly soluble nitrogen is also an important factor as succulent leaf blades are more susceptible as fall becomes winter. Use of a slow release fertilizer while applying lower rates of nitrogen is a great solution if you have experienced snow mold problems in the past.
Gray and Pink snow mold are the two most widely known snow mold diseases in our geographic region. Gray snow mold prefers actual snow cover while Pink can manifest itself just fine without snow so long as the moisture and temperature range are desirable. Most snow molds become visible in March and can grow well into April with the appropriate weather conditions manifesting themselves in discolored patches ranging from 1-2ft to mere inches in diameter. These patches can take on the appearance of cotton candy with colors ranging from gray, to pink, to white depending upon the time of day and type.
Reducing snow along your driveway, walkways, or minimizing large piles will help minimize gray snow mold at your home. Fungicides should only be used as a last resort in a home lawn setting but can offer some protection with proper timing (late fall or early spring) and combination of products. Creating a healthy lawn with a diverse turf grass population alongside proper cultural practices is going to be your best asset toward snow mold prevention. If you do experience snow mold damage next spring, be sure to have your lawn aerated, raked, and fertilized to help maximize recovery of the affected areas.