Broad spectrum protection against fungal infections  Copper Soap is a formulation of a naturally occurring fatty acid and soluble copper. Use the lower recommended dosage rate as a preventative measure. Spray crops before wet and humid conditions occur, in order to protect your foliage from fungal infections.  Use for: Natural organic fungicide. Preventative control of downy and powdery mildew, black spot, rust, botrytis rot and early and late blight.