Green Earth Garden Sulphur can be used to control diseases such as powdery mildew, rust, black spot, scab and black knot as well as certain mites on certain fruits, vegetables, roses, flowers and ornamental plants. Can be dusted directly onto plants or mixed with water for a spray application. For optimal results, repeat every 7 to 10 days until harvest. May be used up to one day before harvest except on grapes for wine (21-day interval is required before harvest).