![]() ![]() This is the opposite of what most gardeners think, me included. They can’t germinate or grow if the leaves are wet. The spores like humidity but hate rain and water. There are lots of home remedies, but researchers have found that simply spraying with plain water weekly can be effective. No wonder the squash get hit every year! Remedies for Powdery Mildew ![]() The spores of the fungi are windborne and can’t be avoided. Cucurbits such as pumpkins, squash, cukes, and melons have three different powdery mildew fungi gunning for them that can thrive in both humid and dry weather. ![]() The powdery mildew that you find on your squash is not the same as the mildew on your beans or roses. The lack of powdery mildew on my phlox is probably due to the fact that it is not caused by just one fungus, but by several different species that are attracted to different kinds of plants. Thankfully, there is no sign of it on other susceptible plants such as phlox. So far this year, only our squash have been affected. Early on, it wipes off or washes away only to return again.Įventually, the affected leaves turn yellow and die on many plants while others continue to soldier on. It starts as white patches on the leaves of squash, lilacs, phlox, bee balm, and other plants, making them look like they have been dusted with baby powder. ![]()
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