Garden Sentinel Biofungicide for Organic Gardening (8 oz) A broad-spectrum preventative biofungicide/bactericide. Naturally occurring bacterium colonizes plant root hairs to prevent disease-causing fungi and bacteria. Controls powdery mildew, leaf spot, anthracnose, gray mold and morel Easy to use; just mix with water and spray on fruit, foliage or drench plant roots. Repeat every 7-10 days or as needed; can be applied up to and including the day of harvest.