Leaves turning yellow or light green. What is this?

Asiya(Zone 9)July 6, 2012

The leaves are turning yellowish or light green and there are dark green spots all over them. It's spreading from the tips of new leaves towards the vines. Is it a disease or just a deficiency?

Pictures:

http://farm8.staticflickr.com/7255/7516413606_e56b747b85_b.jpg

http://farm9.staticflickr.com/8161/7516413698_ec2d83e618_b.jpg

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ken_adrian Adrian MI cold Z5

what is is.. cuke?? squash?? melon???

and could you be a bit more specific where you are???

ken

    Bookmark   July 6, 2012 at 5:07PM
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Asiya(Zone 9)

It's butternut squash and spaghetti squash
Southern California

    Bookmark   July 6, 2012 at 9:07PM
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jean001a(Portland OR 7b)

The first image shows something I've seen locally the past two years. Even though the leaves were that bright yellow, the plants were productive. At this time, I still don't know what it is.

    Bookmark   July 6, 2012 at 11:57PM
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Tiffany, purpleinopp GardenWeb, Z8b Opp, AL

Your pics:

    Bookmark   July 8, 2012 at 11:02AM
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steven1032

my thoughts are iron or manganese defiency. looks like the discoloring is going from the top down and you can still see the veins which is indicating a nutrient defiency.

    Bookmark   July 8, 2012 at 6:29PM
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PSUhorty

It does have the tell-tale signs of an iron deficiency, except for the blotchy yellow areas. That is definitely not symptomatic of an iron deficiency.

    Bookmark   July 8, 2012 at 8:06PM
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steven1032

theres only three possible causes for this. low light, excessive moisture or iron and manganese defiency. im taking that there is plenty of light and the green spots are more than likely that it has not lost its pigmentation in those areas.

ive provided a link that may help you further. this is just my opinion.

Here is a link that might be useful: cucurbit leaf disorders

    Bookmark   July 9, 2012 at 12:32PM
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jean001a(Portland OR 7b)

Thanks for the link. But nothing there matches OP's & my leaves.

Not manganese or iron deficiency. Not herbicide. Futher, mine get plenty of sun, light & water.

Anyone else with a theory?

    Bookmark   July 9, 2012 at 10:13PM
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Asiya(Zone 9)

I added some supplements, but I suppose it could be over watering (there is a leak near my garden).

    Bookmark   July 10, 2012 at 5:34AM
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buckeye15(No OH)

Virus?

    Bookmark   July 10, 2012 at 6:56AM
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jean001a(Portland OR 7b)

Doubt it's virus because the plants are just as productive as all green ones.

    Bookmark   July 11, 2012 at 12:47AM
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steven1032

she mentioned leak, too much water keeps plants from uptaking nutrients no matter how much nutrients are added.

    Bookmark   July 11, 2012 at 8:34PM
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Asiya(Zone 9)

Yes, the plants completely white now. The green spot remained.

    Bookmark   July 11, 2012 at 11:30PM
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steven1032

i had squash plants one time and they looked like tiger spots gree spots turned yellow and then white. i sprayed the leaves with a fish and seaweed emulsion. cleared it up, prob was to high ph levels. just my experience.

    Bookmark   July 12, 2012 at 7:23PM
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