Monterey Bi-Carb Old Fashioned FungicideMicroencapsulated potassium bicarbonate for homeowner control of powdery mildew on all common crops and ornamentals. When Great-Grandma got powdery mildew on her roses, she reached for a box of baking soda (sodium bicarbonate). Potassium bicarbonate is a more effective and less phytotoxic version of this old-fashioned remedy.
Use a sprayer that can reach the undersides of leaves (like our Solo 2L Hand Sprayer), because this product must come in contact with fungal cells to be effective. Less toxic than copper sprays, which are the only other organic fungicide that can cure an existing outbreak.
Not registered for commercial use; commercial growers should use MilStop, which has the same active ingredient. EPA reg. 54705-10. NEW!
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