 As snow mold remains dormant during summer months when other forms of disease fungi are most active, steps to prevent snow mold infestations must be taken near the end of the summer months.While active lawn care such as regular mowing and raking of leaves is typically sufficient to prevent an infestation, the use of chemicals may sometimes be required.Fungicides, which should typically be applied immediately prior to the first large snowfall in an area, can be used if typical cultural methods do not work.