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. 1 day pre-bloom Apply if downy mildew was a problem last year. If plant bugs or flea beetles have been a prebloom problem, or are present and damaging, it may be necessary to apply insecticide shortly before bloom. Always scout and treat as needed. Thiodan is the best phylloxera material.