Zucchini splotches— should I worry?

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What are these splotches on my young zucchini leaves? Should I be concerned? What should I do about it?
 

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IMO yes. It appears that the plant is staying too wet. This leads to mildew
 
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Thanks for the advice, Chuck!

Unfortunately, we continued to get lots of rain, so if overwatering is/was the issue, it only got worse. Here are some updated photos. Same conclusion?
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Thanks! I did some research and it looks like I may have some mildew due to over-watering. I suppose that is what the baking soda is for.
 
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Thanks! I did some research and it looks like I may have some mildew due to over-watering. I suppose that is what the baking soda is for.
Yep, that's what it's for. It looks from the pics that the mildew hasn't formed yet so ASAP get that baking soda on the plant.. If you have whole ground cornmeal or horticultural cornmeal sprinkle all around on the soil. This will also reduce the chances of mildew. Mildew, once started is difficult to get rid of.
 
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Use horticultural hydrogen peroxide at advised dilution.
As it breaks down, it will oxygenate the soil, expelling some of the water.
 

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