Ed Rosenthal's Zero Tolerance Herbal Fungicide is a blend of several herbal oils into a natural fungicide that knocks out spores instantly to eliminate Powdery Mildew, Black Spot, and most molds and fungi. But Ed doesn't stop there. He also adds potassium bicarbonate to move the pH of the leaf surface to the alkaline side, stopping the growth of new spores.
Zero Tolerance's herbal oils evaporate fully so it can be used within a week of harvest. It's 100% Vegan. And it even smells good! Ed developed natural gardening products that I think you will be pleased with. Use them in your indoor, greenhouse and outdoor gardens. They are safe when used as directed and contain no weird chemicals.