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Thread: Poorly grape vine advice.

  1. #1
    Leezy2 is offline Seedling
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    Jun 2016
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    Limousin, France
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    Default Poorly grape vine advice.

    My grape vines have suddenly taken off this year, much to my relief. All was going well and one vine even had a couple of bunches of grapes (at least a year earlier than I was expecting). Then, itís got poorly! Some grapes started turning a deep red colour, thought they were ripening, and now all will drop off with the slightest touch. Leaves have started turning as if itís Autumn already, but Iím wondering if itís a disease now. Iím in france so weíre still averaging 20į plus at the moment. Any help gladly received, as always!
    Attached Thumbnails Attached Thumbnails Poorly grape vine advice.-6355dbf4-75db-4da9-8d0d-f0d495e55afa.jpg  
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  2. #2
    Leezy2 is offline Seedling
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    Limousin, France
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    Default

    Sorry, other photos were too big, had to reduce them!
    Attached Thumbnails Attached Thumbnails Poorly grape vine advice.-img_3187.jpg   Poorly grape vine advice.-img_3186.jpg   Poorly grape vine advice.-img_3185.jpg  
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  3. #3
    Deltawhiskey is offline Sprouter
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    Default

    Hi Leezy2,
    Firstly, this looks like a white grape which obviously should not change colour. How long have the vines been planted? I ask this because it is normal to only crop in the third year.
    It is difficult so see in the picture but it may be Black Rot. Does the change in colour begin in a small dark purple spot then grow to cover the rest of the grape? I get a bit of this on one of my vines and I remove the affected grapes and throw them in the bin. It is a fungal infection that can be controlled by making sure all infected grapes are removed and not allowed to stay on the ground. Spraying with antifungals from early bud burst can also control the problem.
    Hope this helps. If I am wrong please post a bigger picture and we may be able to come up with another idea.
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  4. #4
    Deltawhiskey is offline Sprouter
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    Default

    Hi again,
    Just seen the other pictures. The red leaves may indicate a lack of micronutrients such as magnesium. I spray from bud burst with Epsom Salts together with a seaweed fertiliser in my antifungal spray which enables micronutrients to be absorbed through the leaves.
    David
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  5. #5
    Leezy2 is offline Seedling
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    Jun 2016
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    Limousin, France
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    Default

    Thanks Delta,
    Itís an Autumn Royal, red seedless dessert grape, at least thatís what it was bought as!
    Spent the first year in a pot and is now in its second Summer in the garden, so third year overall. Was still quite small at the beginning of the season though, itís made up for that!
    Hereís a couple of close ups. You can just see the start of it on the grape on the left of the second photo. Itís the fact that the leaves are turning as well that made me think disease, or is this normal?
    Attached Thumbnails Attached Thumbnails Poorly grape vine advice.-img_3188.jpg   Poorly grape vine advice.-img_3189.jpg  
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  6. #6
    nickdub is offline Early Fruiter
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    Default

    No expert on grapes, but I wonder if it might be lack of water ? Takes a while for plants to form an extensive root system so that they can cope with dry periods ...
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  7. #7
    Deltawhiskey is offline Sprouter
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    Hi Leezy,
    It certainly looks like black rot but black rot tends to turn each grape into a hard ‘mummy’. Yours look quite soft. It does look like some sort of fungal infection. I have seen odium look like this. If the leaves turning red are the result of a lack of micronutrients it is probably a different issue to the grape problem.
    Sadly, this years grapes are probably lost and should be removed and disposed of. You could try to remove the damaged ones in the hope that the others will be ok. Speak to one of the winegrowers in your area and they may be able to help with the diagnosis and may even give you information on what to spray with.
    I feel your pain.
    David
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  8. #8
    Deltawhiskey is offline Sprouter
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    Default

    Hi Leezy,
    I have just had some problems with my grapes, due probably to the warm humid weather. If the discoloured grapes are soft, it is probably Botrytis. Remove the bad grapes and increase the air flow by removing the lower leaves. If you can get hold of an antifungal spray give them a spray every couple of weeks stopping a month before harvest.
    Next year spray when the first leaves come out and continue every two weeks until flowering. Continue after flowering and you should be clear.
    Make sure when you remove this years bad grapes that you put them in the bin to prevent the spores contaminating the vines next year.
    David
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