Late July into August is the time many garden diseases, such as powdery mildew, black spot and Sulfur, Neem oil, Serenade and Green Cure are organic fungicides available to you for use in your garden.
Sulfur is a broad spectrum fungicide with an added benefit of controlling mites and thrip. This is important because insect activity can move diseases from plant to plant.
This liquid sulfur is listed with the Organic Material Review Board (OMRI) for use in organic gardens.
Serenade contains Bacillus subtilis, a soil-dwelling bacterium that controls powdery mildew, leaf blight and many other leaf diseases.