how do i kill fungus that grows on peat? i bought a bale of peat moss at my local hardware store. I noticed that whenever the peat is moist everything is fine but as soon as the peat dries a yellow tartar-like residue grows on the surface, specifically it likes to grow on the rim of the pot. This only happens when the peat goes dry. If it maintain it wet it stops growing. Does anyone know how to kill it? is it even possible?