PRECAUTION: Applications of material containing sulfur should not be made just prior to or during periods of high summer temperatures. Concord and other labrusca type grapes may be injured by sulfur. Consult your local agricultural Extension Service or Fieldman for additional information consistent with directions on the label.
Apply directed amount when air is calm, using ground equipment, aircraft, or hand duster.
Apply when berries start to touch and thereafter as needed. PHT Copper Sulfur 15-25 Dust must be applied before the disease appears. Maximum annual application rate is 20 lbs. metallic copper per acre per year. The minimum retreatment interval is 3 days.