Is this a clear cut case of Downy Mildew?? Advice

moonlightcspAugust 20, 2012

I seem to be having problems with my greenhouse cantaloupes and Tigger Melons I did find a few spider mites on most leaves but it really looks like downy mildew can someone please give me their opinion and what the best solution for it is, being only a few weeks away from harvest should I worry? its been spreading too from one side of the greenhouse to the other, its been humid but still lots of sun and heat.

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Forgot to mention I'm growing in Eastern Canada if the temp makes a difference, I always water from the bottom, leaves never get watered, I did try a little skim milk/water to see if it would help but didn't.

    Bookmark   August 20, 2012 at 7:36PM
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rhizo_1 (North AL) zone 7

What does the UNDERside of the leaves look like?

    Bookmark   August 20, 2012 at 10:44PM
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jean001a(Portland OR 7b)

Not downy mildew. More likely mites and/or nutritional issues.

    Bookmark   August 21, 2012 at 12:12AM
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feijoas(New Zealand)

To me, this looks like a case of magnesium deficiency, or just maybe spider mites.
I was going to link pictures, but they all seemed to be of marijuana!
The non-dodgy stuff seemed to be mostly PDF.
Most nutritional 'fixes' are very slow, but if it is a mg deficiency, I've foliar sprayed epsom salts with almost scarily fast results.
It's not fixing the soil imbalances that caused the problem, but it can help get the plants through until there's an opportunity to do more long-term soil work.

    Bookmark   August 21, 2012 at 2:36AM
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Downey mildew generally occurs in cooler temperatures, 60 degrees, so hot and humid probably is not causing DM.

Here is a link that might be useful: About Downey Mildew

    Bookmark   August 21, 2012 at 6:20AM
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I'm going to foilar spray them with my Epson salt spray and see but I think it could be spider mites, I sprayed them all with dawn soap and water but no improvement.

    Bookmark   August 21, 2012 at 9:18AM
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