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Thread: Large Conifers dying in hedge Help!

  1. #1
    Member of forum SM MOWING's Avatar
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    Default Large Conifers dying in hedge Help!

    I have a client with a large hedge surrounding their house made up of about 40 two metre high conifers. So its a prominent fixture of there garden.

    Three conifers in a row have died completely, some other plants have dead branches here and there.

    I pulled one of the dead branches off and inside was a 3-4mm perfectly drilled hole in the centre.

    Looks like some kind of borer.

    Thoughts and how do I treat to stop the other trees around it dying!
    Independent and i know it

  2. #2
    Senior Member PaulG's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    If it's borers, they attack trees that are under stress. Damage to limbs can then lead to Conifer Canker, a disease which is harder to recover from if the tree has declined too far. The spores of the canker fungus can transfer from tree to tree via rain splash, birds etc. Much more common when trees are planted in a hedge as these are. I read once that if the foliage is a rusty brown colour and not completely dead yet you can spray with something with teh active ingredient being phosphorus acid or copper oxychloride or inject for larger plants that can't be completely sprayed. The underlying cause though of all this is stress to the plants from lack of water and/or nutrients which will need to be rectified first. Don't treat while plants are still under stress. Good luck with it. Interested to see how it turns out.

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    Senior Member imoww's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Ive been told if he holes are straight through the tree and come out the other side ( with what looks like dried up sawdust) then its a borer.
    I too have clients conifers dying. one in particular has 2 different types of conifer . (Book leaf and the standard)
    Everything looks good with a haircut.... ɐuıɥɔ ɯoɹɟ pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐl ǝɥʇ sʇɐɥʇ

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    MEMBER Fred's mowing's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Quote Originally Posted by PaulG View Post
    If it's borers, they attack trees that are under stress. Damage to limbs can then lead to Conifer Canker, a disease which is harder to recover from if the tree has declined too far. The spores of the canker fungus can transfer from tree to tree via rain splash, birds etc. Much more common when trees are planted in a hedge as these are. I read once that if the foliage is a rusty brown colour and not completely dead yet you can spray with something with teh active ingredient being phosphorus acid or copper oxychloride or inject for larger plants that can't be completely sprayed. The underlying cause though of all this is stress to the plants from lack of water and/or nutrients which will need to be rectified first. Don't treat while plants are still under stress. Good luck with it. Interested to see how it turns out.
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^

    This is your complete answer ...................................... That is all !!!!
    Cheers Fred.

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    Member brodie's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Sounds like cypress canker. If it is it really needs to be treated properly and quickly. The canker will move quickly if not treated. I'll be treating a cypress canker next week, luckily we caught it early in this hedge.

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    Senior Member imoww's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Does anyone know why some conifer hedges have large gaping holes in them?
    Everything looks good with a haircut.... ɐuıɥɔ ɯoɹɟ pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐl ǝɥʇ sʇɐɥʇ

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    Member brodie's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Quote Originally Posted by imoww View Post
    Does anyone know why some conifer hedges have large gaping holes in them?
    It could be for a number of reasons. Any pictures you could get would help identify the issue

  8. #8
    Member of forum SM MOWING's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Thanks for your help everyone!

    What fertiliser would one recommend for conifers?
    Independent and i know it

  9. #9
    Senior Member Scooby Steve's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Quote Originally Posted by PaulG View Post
    If it's borers, they attack trees that are under stress. Damage to limbs can then lead to Conifer Canker, a disease which is harder to recover from if the tree has declined too far. The spores of the canker fungus can transfer from tree to tree via rain splash, birds etc. Much more common when trees are planted in a hedge as these are. I read once that if the foliage is a rusty brown colour and not completely dead yet you can spray with something with teh active ingredient being phosphorus acid or copper oxychloride or inject for larger plants that can't be completely sprayed. The underlying cause though of all this is stress to the plants from lack of water and/or nutrients which will need to be rectified first. Don't treat while plants are still under stress. Good luck with it. Interested to see how it turns out.
    I second Fred's response great post Paul.

  10. #10
    Senior Member Wyadra's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    There are a lot of tree companies who offer treatment for cypress canker. It's a rort, treatment is a waste of money. Read the Italian study...

    http://cupressus.ipp.cnr.it/cypfire/...res_Canker.pdf

    http://www.depi.vic.gov.au/agricultu...ypress-decline

  11. #11
    Senior Member bb1's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    There is anorther cause of perfectly drilled holes in tree's, its a thing called grumpy neighbour syndrome, can sometimes be extremely difficult to rectify

  12. #12
    MEMBER Fred's mowing's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    I have a client that I recently trimmed her cypress hedge.
    I noticed that at the base of one trees, a syringe sticking out.
    I questioned her about this & she told me an arborist had treated that particular one for cypress canker.
    She said that the treatment was successful, & yes, the hedge looked to be in good health.
    Sorry I can't post the pic I took as the Samsung phone & the Apple mac don't seem to be getting it on.
    I'll get my daughter to help & try & post it tomorrow.
    Sorry, Im just a technology challenged old coot
    Cheers Fred.

  13. #13
    Senior Member Scooby Steve's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Quote Originally Posted by Fred's mowing View Post
    Sorry, Im just a technology challenged old coot
    Cheers Fred.
    You are not on your own Fred, i'm rowing in the same boat.

  14. #14
    MEMBER Fred's mowing's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    The tree on the far left of the hedge was the one that was treated.
    This was a Leightons green.
    All conifers can suffer from cyress canker but, from my experience Monterey cypress (Cupressus macrocarpa)seems to be the most susceptible.
    Im considering pulling out (part of or all) of our own Monterey cypress hedge that I planted 15yrs ago.
    It is badly infected with Cypress canker.
    Many growers are now shying away from Monterey cypress because of this.
    Even if you replace infected plants, there's still a fair chance of re infection.
    Nothing worse than loosing a plant in an established hedge, particularly when its a feature of the property.
    Cheers Fred.
    Attached Images Attached Images

  15. #15
    MEMBER Fred's mowing's Avatar
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    Default Re: Large Conifers dying in hedge Help!

    Ooops, sorry, pic is sideways x2 & pic of hedge isn't there
    I'll have another crack later.
    Cheers Fred.

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