For years, potassium bicarbonate has been found to be a highly effective product to control powdery mildew. Kaligreen is a formulation of potassium bicarbonate designed to do this job on a commercial basis. Toagosei Co. It is marketed in the U.S. through Nichimen America. Kaligreen is registered for use on grapes, cucumbers, strawberries, roses, and tobacco. We will expand the usage list to other crops as data is collected and evaluated.
Coverage is extremely critical.
Use with sufficient water volumes and a spreader to ensure complete and thorough coverage. It depends on the program. If used by itself it should be applied at 5-7 day intervals. If used in conjunction with other fungicides in a resistance management program, the application should be used in accordance with the individual recommendations. On grapes, up to the day of harvest.