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780 Views 5 Replies Last post: Apr 24, 2014 7:23 AM by MikeHardman RSS
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Apr 23, 2014 6:28 PM

Disease of Hawthorn?

Hello,

 

Please can anyone help me identify and advise a treatment for my Hawthorn Hedge.

 

Last year I noticed some of the leaves appear to be growing distorted as if like needles. during the winter I cut the hedge back hard as it was too big anyway and hoped that the new growth for this year would not be affected. Unfortunately it has reappeared. Affected areas seem to be isolated on branches and is only about 5% of the hedge, the rest is looking healthy and completely normal.

 

I have looked for bugs using a magnifying glass and there are none apparent.

 

Please help, Does anyone know what this is?????

 

Thankyou. the file attached is a picture of an affected twig.

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  • Currently Being Moderated
    Apr 23, 2014 9:09 PM (in response to Gabby)
    Re: Disease of Hawthorn?

    Hi

     

    Is it possible the hedge has been subjected to a systemic herbicide

     

    Steve

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    • Currently Being Moderated
      Apr 23, 2014 10:22 PM (in response to basquesteve)
      Re: Disease of Hawthorn?

      I concur with Steve - pesticide overspray/drift is a possibility.

       

      But I notice that:

      - the leaves seem to be a healthy even green colour

      - they have a certain consistency of (abnormal) shape

      - only a small % of the hedge is affected

      That makes me think you could be seeing 'branch sporting'.

      In horticulture, there are many forms of plants that differ from the typical species by being 'interesting' in some way. That may be variegation, differently coloured fruit, upright habit, or many other things. Some of those forms arise through chance seedlings, which happen to get noticed and nurtured. Some arise by individual branches showing different characters. (It is all about genes, the chemicals that affect the way they are expressed, and other factors such as responses to viruses.) Such branch sports may be propagated by cuttings, grafting or micro-propagation. All that is just by way of explaining and proving that plants can produce branches with abnormal characteristics. You could be seeing some of that.

       

      Mike

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          Apr 23, 2014 11:23 PM (in response to Gabby)
          Re: Disease of Hawthorn?

          Hi

           

          To me it does not appear lethal but unusual, personaly I would leave it be but keep a close eye  other than the shape of the leaves its seems OK

          I have seen similiar effects after a herbicide attack and seen shrubs grow out of the effects

           

          Steve

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            Apr 24, 2014 7:23 AM (in response to basquesteve)
            Re: Disease of Hawthorn?

            Gabby,

             

            I agree with Steve - leave it be.

             

            Personally, if it is just one tree that's affected, I suspect it is not aerial chemical damage and I suspect it has always been that way and you've simply not noticed before (very easily done). I say 'aerial' because there is a chance of chemical effect arising from something at the roots. I have seen some lilac trees were one was poorly, and it turned out to be due to a leaking gas pipe in the soil.

             

            For commercial suppliers of hedging, one of their problems is ensuring consistency of the plants. When folks buy a bunch of saplings for use as a hedge, they are usually expecting/requiring consistency - so the hedge grows evenly in terms of height/speed and in terms of foliage texture and of flower/fruit colour if applicaable. Hedging plants grown from seed can be variable, due just to chance. You may have been unlukcy in that one of your plants was slightly different and not rogued-out by the supplier.

             

            Mike

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