Powdery mildew?

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Dec 21, 2015
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SW Michigan
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The white patches on leaves - is this powdery mildew?

If so, do I cut off the leaves? I've sprayed the plant with baking soda a few times in the past several weeks, but it doesn't seem to be working. Should I try neem oil?

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Logan

Logan
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Mar 21, 2017
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redditch west Midlands UK
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It looks like powdery mildew, I've had it on marrow plant leaves and I just left it, it didn't hurt the plant or the production of the marrows.
 

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