If you discover dead patches of grass with white, grey, black, or pink mold, it’s time to take action and get rid of it. Left untreated, it will continue to spread and affect a larger area.
Fortunately, getting rid of lawn mold is fairly easy to do, and by fixing the problem you can also keep it away.
Types: Snow mold is the most common and there are 2 kinds—grey and pink. Grey snow mold only attacks the blades and is white and grey in color. Pink will attack the crowns as well, and starts off-white, but changes to a pink color. Slime mold starts off slimy before it turns to powder. Rust looks like an orange powder on the grass. There are more types, but this gives you a good idea of what to look for. If you’re seeing powder of any color, or slime, it’s lawn mold.
Remove: Give the affected area a good rake and mow the grass. Remove the grass clippings immediately. The first reason for this is to get rid of as much of the infection as possible. The second reason is to help dry the area out. These diseases love the damp, and leaving the cuttings would give it the perfect conditions to grow.
Aerate and Dethatch: Thatch also makes for a damp surface, so if you have more than a half-inch of it, get rid of it by dethatching. You’ve already raked, and that helps; aerating will help even more. Plus, aerating makes for better drainage, and that too keeps the surface drier. Lawn mold thrives on moisture; don’t give it what it wants.
Let the sunshine in: Shady areas will always be prone to these diseases. Cut back branches to get sunshine on the area. If this isn’t possible, consider planting a bed of shade-loving plants there instead.
Watering: I can’t stress enough that surface moisture is the enemy. Do your watering early in the day so the sun and air have time to dry the blades. Cut back on how often you water, and use more water for a deep soaking. This will help the grass roots to grow deeply, and the plants will become healthier.
Nitrogen: Get your soil tested and find out your nitrogen levels. Snow mold is caused by too much nitrogen added to the lawn in late fall. That’s why August should be the very latest you add any to your yard. Some types of lawn mold do well when there is too little nitrogen in the soil, so balance is the key.
These simple things will cure your turf. By raking out the area, dethatching, and aerating, you’ll improve things quickly. Mowing & removing all clippings will stop the spreading of the disease. Drying out the surface—with better sunlight, proper watering, and balanced nitrogen—will keep it from coming back. It’s just that easy to get rid of lawn mold and keep it away.