Some sort of insect on a vine

Discussion in 'Pests, Diseases and Cures' started by Howard Stone, Apr 27, 2020.

  1. Howard Stone

    Howard Stone Gardener

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    Anyone know what this leaf infestation is, and what (if anything) to do about it?

    upload_2020-4-27_17-16-24.png



    It's a well established (20 years old) Vitis purpurea. The plant itself seems to be happy enough.


    upload_2020-4-27_17-17-27.png
     
  2. pete

    pete Growing a bit of this and a bit of that....

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    Its well advanced for this time of the year?

    Nice Agave, BTW.

    Think I had something similar on one of my grape vines last year, most of the flowers aborted and the leaves had strange bumps.
    I'm guessing insect, but what insect remains a mystery to me.
     
  3. noisette47

    noisette47 Total Gardener

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    It's what the French call 'mildiou' (mildew) which doesn't necessarily correspond to the English version. It's a fungal disease. You could try taking off the worst affected leaves, dispose of them carefully, and treat the vine with Bordeaux mixture.
     
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    • Howard Stone

      Howard Stone Gardener

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      Thanks. I put mildiou vigne into google and came up with this

      Plasmopara viticola - Wikipedia

      It’s clear that it’s a big problem for grape production, but hopefully it’s not going to significantly weaken my plant, which only rarely produces grapes and then inedible ones.

      Nevertheless I’ll spray as advised.
       
    • Howard Stone

      Howard Stone Gardener

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      I’m not sure that the window cleaner agrees!
       
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      • pete

        pete Growing a bit of this and a bit of that....

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        Interesting @noisette47 , is it the same as this, just one of my vines was infested last year.
        DSC_0219.JPG
         
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        • pete

          pete Growing a bit of this and a bit of that....

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          Can you still buy Bordeaux mixture?
           
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          • noisette47

            noisette47 Total Gardener

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            That looks like the early stage, @pete. Mine get it every year 'cos I don't follow my own advice and spray :redface: Whether it's mildiou or oïdium, the treatment's the same. No idea now whether BM is banned or not :noidea: It's classed as OK for organic gardening but there were rumours of it being banned anyway :wallbanging:
             
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            • pete

              pete Growing a bit of this and a bit of that....

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              My picture was taken in August, the flowers never opened in june and the buds dropped off, but there was no visible fungus.
               
            • noisette47

              noisette47 Total Gardener

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              I'll see if I can copy your photo and description to a Frenchie (with your permission) who's far more knowledgeable than me about vines :scratch:
               
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              • Mike Allen

                Mike Allen Total Gardener

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              • JWK

                JWK Gardener Staff Member

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                Not in the UK.

                The two chemicals needed to make it are cheap and easily bought online, the recipe to make it is also freely available. We are not supposed to make our own fungicides, I just happen to experiment and leave the mixture in my sprayer ahem ...
                 
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                • Freddy

                  Freddy Miserable git, well known for it

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                  BM was banned a couple of years ago wasn’t it? It just so happens I bought a few before the ban :whistle: That said, I’ve never needed it since. Don’t seem to get blight here.
                   
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                  • noisette47

                    noisette47 Total Gardener

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                    Well, well....you were absolutely right, @pete! The verdict is l'érinose de la vigne. Gall Blister mite. Grapevine blister mite / RHS Gardening It doesn't explain why the flowers dropped, though. Drought? Cold/wet?
                     
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                    • Mike Allen

                      Mike Allen Total Gardener

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                      I believe BM was among several horticultural and agricultural chemicals banned under EU regulations.

                      BM was featured in the Victorian Garden series. Gardeners of that era used to make their own. It is highly dangerous.
                       
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