The copper soaps are 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 soap.

How do you use copper soap?

Apply as a dormant spray in late fall during a period of dry weather. Spray all plant surfaces thoroughly with NATURAL GUARD® BRAND BY ferti•lome® COPPER SOAP FUNGICIDE READY-TO-USE. Begin treatment when new growth emerges and repeat every 7 to 10 days for as long as needed to control disease.

When should I apply copper fungicide?

Ideally, apply copper fungicide before fungus is visible. Otherwise, apply the product immediately when you first notice signs of fungal disease. If the fungus is on fruit trees or vegetable plants, you can safely continue to spray every seven to 10 days until harvest.