Dave from Philadelphia, Pa writes
Per the Bonide Liquid Copper Product Label: To control powdery mildews, use a solution of 0.5 to 2.0 fluid ounces of this product in a gallon of water. For best control, start spraying before the disease is visible or when mildew is first visible on the plant. Spray all plant parts thoroughly (top and bottom of leaves), and repeat every 7 to 10 days. When powdery mildew presence is expected on a plant, spray the plants at the minimum application interval during the first 2 weeks after emergence.
Answer last updated on: 05/09/2017
