Posted: 3/10/2026 8:06:37 PM EDT
[Last Edit: NotMrWizard][Edited]
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Used to get great harvests of cucumbers, butternut squash, and zucchini. But the past 4-5 years, powdery mildew just devastates the vines if we get a few days of rain. Soil is clay, and I’ve sprayed the plants after a rain with both milk and baking soda/water mixture, to no avail. Is it the clay soil? I’ve always had sand prior to this house. First time I’ve had to deal with it. I even tried growing a planter of cucumbers on the back deck last year, which is 50 yards from the garden. Nope. They got the mildew and rotted. Grapes, tomatoes, green beans, peppers, everything else grows great. But the vine vegetables, not so much. Are there mildew-resistant seeds available? Thanks for any help! ETA: I meant to post this in Home and Garden, so please move this post if necessary. Thanks! |
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Have a little bit of this on some snowpeas in the greenhouse right now. I read something about a weak solution of Dawn liquid dish detergent in water. I honestly haven't tried it. It's very close to the time of year where the peas will no longer produce due to the heat, so I'm not overly worried about it. I think I goggled it. |
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| I use Immunox on our roses and grape vines for that, there are other products with the same goodies inside. I know the commercial vineyards here use sulfer-based spray for powdery mildew, not sure the specifics but it is pretty common and probably easy to google up. |
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Use this as a preventive before the mildew takes hold. Treat plants before rainfall, and after rainfall when plants have dried. Has worked to at least slow the progression of mildew on our cucumbers and squash. Bonus is, we spray our tomatoes with the same thing, it does an excellent job of preventing blight. Daconil Also, keep air circulating around your plants, and put mulch/compost/dark plastic on top of the soil surrounding your plants. This will help minimize the mildew's potential to grow and proliferate. |
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Thanks for the tips! Hopefully this will mitigate it a bit. I do make sure I’ve got airflow around the plants, and they’re not bunched against each other. Funny thing is that once a vine escapes the garden and onto the lawn, the leaves on that part of the vine in the grass don’t seem to be affected. |
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