Nutrol (potassium dihydrogen phosphate), EPA# 70644-1, READ THE LABEL
Nutrol provides post-infection, antisporulant, and limited eradicant control of powdery mildew, with low risk of disease resistance development. It provides no protective activity, but significant post-infection activity when applied within a week after the start of an infection. Apply 5-10 pounds per acre per application, using a maximum 3 pounds product per 10 gallons. Nutrol is relatively ineffective at eradicating well-established powdery mildew infections. It is most effective when applied with short (7-day) intervals when applied sequentially, and can be used in a tank mix with other powdery mildew fungicides. For best results, apply with a non-ionic surfactant such as Induce. 4 hour reentry interval, 0 days to harvest.