For control of powdery mildew, begin application at 12-18 inches of shoot growth. Begin applications of Rubigan at 12-18 inches of shoot growth. Do not apply more than 19 fl oz per acre per season. Use Procure to protect against new infections. Do not apply more than 32 oz Procure per acre per season.
Sulfur is phytotoxic on many varieties .
Trial on a few vines before regular use. An automatic spray is recommended pre-bloom. Thiodan is the best phylloxera material. Thiodan is phytotoxic to some grape varieties . If you have not used Thiodan before, spray on a few vines to test for phytotoxicity.