Powdery mildew

Asked September 9, 2019, 10:48 AM EDT

Good AM !! Is it too late to do anything for powdery mildew on my pumpkin & squash leaves? Should have caught earlier, now it's a lot!! Would the baking soda, etc. spray work @ this late date? Thanks so much! Veronica Kalamajka

Wayne County Michigan

1 Response


What you want to do depends on how far along your pumpkin and squash are, and how much of the plant is still healthy. If you still have some green leaves and the fruit are protected from the sun, sprays might slow down disease spread. All products are protective, not curative. Biofungicides (like Serenade), sulfur products, and some oil sprays can work. It is important to read and understand the label of any product you use.

If a majority of the leaves have died and the fruit are ripe (solid color, thump when you tap them, resist puncturing), than go ahead and harvest them and let them cure somewhere shady where they won't get sunburned.

If this is a yearly issue, the most effective route is to find a resistant variety. Different seed catalogs denote resistant varieties in different ways, but they are available.