Molds may appear in your lawn after a wet winter as the snow melts or in moist areas that do not have good sun coverage. Also, the early spring, wet and warm, is a breeding ground for the fungus that causes the mold. Snow molds have a gray or pink appearance, while slime molds appear white, gray, purple or yellow. Although the fungus looks serious, it will not harm lawn grasses, but may cause an undesirable appearance to the lawn. Chemical controls are not needed; just proper care of the lawn.
Rake areas where the mold is thick to remove dead grass from the lawn, which mold feeds on, and break up the mold deposits.
Mow the lawn so that the grass is 1 inch high to destroy large mounds of the fungus. Remove further fungus from the lawn using a strong blast of water from a hose. Remove dead grass from mowing the lawn and use it in your compost patch.
Run a power aerator along the mold trouble areas to help the soil breathe and prevent standing water in the lawn. If you use a handheld aerating tool, work the troubled area by hand. Run your aerator in two directions for best results.
Rake up leaves from trees in the fall to remove dead material that mold feeds on.
Spread out large piles of snow during the winter so that it melts evenly, preventing patches of water in the lawn that can breed mold.