Sorry to have to tell you this but powdery mildew is a problem during the more humid and rainy times of late summer. I have seen it on several flowering annuals and perennials but it seems to do the most damage to squash plants. Sometimes there is just a little bit and it's no big deal. Sometimes it will kill entire plants. There doesn't seem to be a cure for it but there are ways to control it's spread, like using
baking soda with water.
Some squash plants have green leaves with light green or gray markings/coloring on them. This can sometimes be mistaken for powdery mildew. Inspect the leaves closely and you will see that normal leaf coloring will have a pattern that follows the shape of the leaves - beautiful. Powdery mildew will be blotchy and spotty and dusty - ugly.
Here is an
article about powdery mildew from Organic Gardening.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEheyI6VlO8lqqmE33hpO2FF8a4jwi9-ElzAipsU-T04GG78moVRnQT83JIsPlgwA8GcgxeZPMVAPVHJef-ClEqMz_oXi9-xldCDX4MQiEtZY1YIFjclmPkCEUrHVgHOHDkSsHKp9E0e0rE/s1600/DSC05430.JPG) |
squash leaf with normal grey markings - no powdery mildew |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge_cSf0Z8m80dCl0WGxl7RNe-T6isAViXEAoO5CcJeWUIUyn8hmt_bslLVr0FoKGFcoVfeQCdbNRslYF84881sXph0qFeoWqxIX4mLssBmiFbv1vE5leCaJgqS7CYuy2aRPF89A8qA6Do/s1600/DSC05432.JPG) |
squash leaf with powdery mildew |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6qgYK2kY9zW6xn9JRlIsCjjs2smbn6yX9NZobb2L7GtTzDedl06vRbvaFnz8BuvXTWdek-xfSjCcWOg8cLArKchsfUX6GaFiNttY6PoOP729NLndZ6SWp6hWqi7deoGDNYaiZwfKG0PY/s1600/DSC05433.JPG) |
squash leaf with powdery mildew |
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