Ed Rosenthal’s fungicide is a potent mix of food-grade plant oils that eliminates and controls powdery mildew and molds. Ed’s blend of herbal oils fully evaporates, leaving no residue. Additional ingredients change the pH of the leaf surface to retard the growth of new spores. Zero Tolerance® is Clean Green certified and 100% vegan. As the commercial market becomes more competitive, it is critical that crops test clean. Ed Rosenthal’s Zero Tolerance® - natural, environmentally safe garden solutions.