Cucumber cotyledons with white spots

Jay5April 20, 2012

I planted some cucumber seeds in Jiffy mix indoors March 30 and they are doing well except I have started seeing some of them with white spots on the cotyledons.

They are under lights 16 hours and have a fan on them on low about 8 hours.

The spots aren't powdery and they have air flow so I would think it wasn't powdery mildew at this stage.

Search came up with nothing.

Any ideas? Nothing to worry about?

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Just a follow up. Took a really good look and the spots are really thinned out places on the underside of the cotyledons, sort of sunken looking. Since the places are thin they look like spots on the tops of the leaves.

    Bookmark   April 20, 2012 at 7:26PM
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jean001a(Portland OR 7b)

Perhaps environmental stress.

Can you post images for us, please?

    Bookmark   April 20, 2012 at 11:00PM
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Sure thing. If it works that is. You may notice there are no spots on the regular leaves and to me other than this issue they look fine.

    Bookmark   April 22, 2012 at 6:38PM
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Ohiofem(6a Ohio)

Maybe your cotyledons are just dying, as they are supposed to at this point. If there are no spots on the true leaves, I wouldn't worry about it. But I would get them outdoors as soon as you can.

    Bookmark   April 22, 2012 at 6:52PM
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