Ask a Question forum: Cucumber leaves

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Calvert County, Maryland
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Ahha
Jul 31, 2017 7:52 AM CST
My otherwise very healthy cucumber plants have some sort of blight. I can't find any bugs or bug eggs to explain it. It started on a plant that gets plenty of morning and late afternoon sun. This plant has produced several perfect cucumbers so I ignored the spots as they were slow growing and only on a few very low leaves.
We've just gone through a heat and humidity wave (but are now in springtime temperatures). Now my other cucumber plant that only gets afternoon sun, has the same spots. It is only in the blossom stage, no cucumbers yet.
I have only used Neem oil with water to spray regularly.
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Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Jul 31, 2017 9:59 AM CST
Your cucmbers may be suffering from Downy Mildew. The cure is less humidity, more heat and sunshine and good air circulation. Smiling Actually, there is no cure but those living conditions will make it less comfortable for the downy mildew and the cucumbers will be happier.

Several sights suggest using fungacides but the Universities of Delaware and Maryland articles I read warn against fungacides as the Downy Mildew is becoming resistant so several different fungacides would have to be used copiously to make a dent.

This fall, pull the plants and dispose of the corpses and get rid of all litter left on the ground. Next year, plant downy mildew resistant cucumbers. And move them to a different location.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Calvert County, Maryland
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Ahha
Jul 31, 2017 12:55 PM CST
Thank you Daisyl. So, in the meantime, I just let it go? ( I can do that). Will my cucumbers continue to develop ? I'll try snipping some of the leaves off for better circulation, but the first plant that it attacked was right out in the sunshine and breezes, before we hit a humidity and heat wave. :/.
I will definitely be more conscientious next year, when I get my seeds/plants.
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Jul 31, 2017 12:58 PM CST
I don't know how the fruit will be affected. All you can do is let them grow and wait to see.

It will spread to other nearby plants. So if you have other plants close by that you value, you will have to make some choices.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
[Last edited by DaisyI - Jul 31, 2017 1:01 PM (+)]
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Name: Philip Becker
Fresno California (Zone 8a)
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Philipwonel
Jul 31, 2017 7:03 PM CST
Ahha: Howdy 😁
It could also be leaf miners.
I'd look both up. To determine, what to spray with.
😎😎😎
Anything i say, could be misrepresented, or wrong.

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