BONIDE 16 oz Liquid Copper Fungicide Ready-To-Use controls plant diseases such as, powdery mildew, downy mildew, black spot, peach leaf curl, rust, and other listed diseases. Perfect for use on vegetables, roses, fruits, nuts, herbs, ornamentals, and turf. Approved and suitable for all of your organic gardening needs. The active ingredient of Liquid Copper is Copper Octanoate, or Copper Soap. Copper makes a great option for use on all of your plants. This product is conveniently ready to use when it arrives. The spray nozzle makes this product easy to deploy and can be used up to the day of harvest.