Need a Sherlock Holmes of apple disease (or ?)

zestfest(7)May 22, 2013

Hello, fellow fruit growing fiends:

I have a mystery that has stumped many apple disease experts -- are you the detective that can crack this case?

My apple trees get puckered leaves and pale yellow spots areas. Some of the leaves turn yellow with green veins, which I understand could be a sign of iron chlorosis. Later in the season the leaves get brown spots. I sent the leaves to a local apple disease expert and she said she could not find any signs of fungal spores. The trees also have not bloomed, although they are 6 or 7 years old and have lots of fruit spurs. Local soils tend to be acidic, although my home test kit was inconclusive.

Thanks in advance for reading and for any suggestions. :)

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zestfest(7)

Here's how the leaves look from a distance.

    Bookmark   May 22, 2013 at 3:23AM
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zestfest(7)

Here are the brown spots that develop later in the season.

    Bookmark   May 22, 2013 at 3:24AM
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zestfest(7)

Here's a pic of the back of the leaf with the brown spots. Note, I realize the veins in the photo above are yellow, but there are also leaves where they veins are green and the leaves are yellow... I will take a pic of that asap. Thanks again in advance for any ideas.

This post was edited by zestfest on Wed, May 22, 13 at 3:32

    Bookmark   May 22, 2013 at 3:29AM
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Scott F Smith(6B/7A MD)

I would say its a disease, nutritional issues don't make spotting like that. The lower leaves are just dead spots, I don't see signs of any spores on those spots. There is a chance it could be black rot, but it could also be some more obscure disease. I don't think its scab. If you sent the lower type of leaf for diagnosis all the spores could have been dead. The upper leaves look like the active infection eating at the leaf.

A few years ago someone had a similar looking thing and there was no conclusion on the diagnosis. I linked the thread below.

Scott

Here is a link that might be useful: old thread

    Bookmark   May 22, 2013 at 8:43AM
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KG_in_CT

What are you spraying the trees with?

    Bookmark   May 22, 2013 at 9:21AM
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zestfest(7)

Very grateful for the input, thank you. I spray with horticultural oil and lime sulphur before bud break.

    Bookmark   May 22, 2013 at 10:35AM
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KG_in_CT

Have you sprayed since the leaves have come out?

    Bookmark   May 22, 2013 at 12:15PM
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KG_in_CT

Have you sprayed since the leaves have come out?

    Bookmark   May 22, 2013 at 1:41PM
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zestfest(7)

No, I have not. I'm hoping to get a diagnosis first.

    Bookmark   May 22, 2013 at 2:07PM
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jean001a(Portland OR 7b)

Is it in the ground or a container?

    Bookmark   May 22, 2013 at 9:14PM
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zestfest(7)

The apples are in the ground. The soil they are in isn't great. It's quite sandy -- it was grass turf that I turned over to make room for the apples.

    Bookmark   May 22, 2013 at 9:31PM
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