Natural Guard Copper Soap Liquid Fungicide is a patented, fixed copper fungicide, made by combining a soluble copper fertilizer with a naturally occurring fatty acid. The copper and the fatty acid combine to form a copper salt of the fatty acid, known technically as a true soap. Copper is one the oldest fungicides and bactericides used to control a variety of plant diseases. This includes blackspot, powdery mildew, leaf and fruit spot and other listed plant diseases. Labeled for use on roses, ornamental shrubs, grapes, peaches and houseplants.