Mildew On Squash

First of all, you didn’t do anything wrong. This is powdery mildew and squash is prone to this problem. Although you can’t get rid of it completely, you can treat it organically so that you can continue to harvest squash the rest of the summer. There are several organic fungicides you can use including Green Cure, Actinovate, sulfur and copper soap. Ask at your local garden center and they can guide you to an organic product. Be sure to spray weekly from now on, concentrating especially on the new foliage and stems, both under the leaves and on top. If it rains hard a day or two after you spray, do it again. Next year start spraying early in the season BEFORE the plant has the problem – knowing that squash and cukes are prone to mildew, you’re better off fighting back early in the summer!