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Brown spots with holes on Zucchini Leaves

 
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I just noticed yesterday these brown spots with holes on my Zucchini plants -- all three of them.  They weren't there the day before I believe.

Is this due to magnesium deficiency?  Should I go buy some epsom salt and water some in?

I haven't augmented my beds with magnesium.   Just Jobe's Organics Vegetable and Tomato Fertilizer 2-5-3.  I haven't done any green sand, azomite nor kelp as well.

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steward
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Location: West Tennessee
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Hi Jennifer, I think the spots on your zucchini leaves are from anthracnose, a fungal disease, and not a mineral deficiency.
 
steward
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Location: Cache Valley, zone 4b, Irrigated, 9" rain in badlands.
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Doesn't look like a magnesium deficiency to me.

 
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