For a number of years baking soda (sodium bicarbonate) sprays have been recommended for controlling powdery mildew and black spot fungal diseases on roses, phlox, and other garden plants. Baking soda has been shown to not only prevent fungal spores from getting established, but also to kill them once they get started. But baking soda sprays don't readily cover the leaves, and they quickly wash away. The addition of horticultural oil improves the coverage but can damage foliage.
Now a new product provides an alternative to the common baking soda solution. GreenCure is a mixture of potassium bicarbonate and a spreader-sticker, and it's 25 to 35 percent more effective at controlling fungal disease than straight baking soda. It's formulated to completely cover the leaf surface, yet not be harmful to the foliage. GreenCure has also proven to be as effective as chemical fungicides in controlling the disease, making it a safe alternative for both outdoor and indoor use.
For more information on this new fungicide, go to: GreenCure.