UKTC Archive

Re: Tree hazard potential assessment study Epicormics and Ivy

Subject: Re: Tree hazard potential assessment study Epicormics and Ivy
From: Brewster, Ian
Date: Nov 03 2019 09:54:25
Noted that the crown periphery in parts is sparse, dying back or possible 
stages of retrenchment.
If allelopathic would this affect the main stem via lenticels or the 
competing growths below. Doubt much can survive the deep shade that Ivy gives 
so doubt the latter. Though competition for water and nutrients may stress a 
mature tree.

Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: Wayne Tyson <wt750mv@xxxxxx.com>
Date: 02/11/2019 21:44 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Tree hazard potential assessment study Epicormics and Ivy

Bill et al,

Thanks for the responses.

I'm an oddball who makes the mistake of telling it like its is (presuming
that I know), so I'm not a part of any whacking group. One of Ewel's
criteria for a restored ecosystem is "resistance to invasion." A healthy
ecosystem should be able to resist most invaders, but there seem to be
notable exceptions. H. helix doesn't seem to be much of a problem in these
parts.

Is there any evidence that ivy is allelopathic? What's the active
principle/mechanism?

I *suspect* that the humidity is higher under the ivy, and it becomes a
moisture trap.

As to the the limbed-up tree, I can't tell much from a photo either, but
the fact that buds were activated just at that one spot makes me wonder
what stimulated the buds to develop into branches. I can't see, of course,
but given the tree's age, I suspect that the branches were removed long ago
and the injuries are covered by bark. US don't do much post-failure studies
or assessments; the main priority is to tidy up (and destroy the evidence).

Best,
Wayne

On Sat, Nov 2, 2019 at 11:57 AM Bill Anderson <
anderson.arb.original@xxxxxx.com> wrote:

It looks to me like somebody made a half-hearted attempt at removing the
ivy from the lower stem.... But from this distance I wouldn't draw any
conclusions. Epicormics being produced like that, when a tree' had lower
branches removed excessively are not surprising to me.
The relationship of Ivy (Hedera helix) with its host trees in this country
Wayne, is not clear. Some sort of alellopathic deal is going down. Many
hosts seem to live quite happily with it and it never gets anywhere near
growing out of the top of the crown. Once a tree is declining it's a
different matter and stumps completely covered in Ivy (or houses) are a
fairly common sight. I'm vaguely aware that you guys have organisations
devoted to eliminating Ivy (No-Ivy League IIRC?) much as we have volunteers
attempting to wipe out Rhododendron ponticum in some areas.
Bill.

On Sat, 2 Nov 2019 at 09:54, Brewster, Ian <Ian.Brewster@xxxxxxx.co.uk>
wrote:

Looks like reaction growth (dormant buds becoming viable) to an overly
lifted crown and the ivy is exploiting the now available light.


Sent from my Samsung Galaxy smartphone.
Looks like reaction growth (dormant buds becoming viable) to an overly
lifted crown and the ivy is exploiting the now available light.


Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: Wayne Tyson <wt750mv@xxxxxx.com>
Date: 02/11/2019 05:25 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Tree hazard potential assessment study Epicormics and Ivy

Dear lads and lassies,

Would y'all have a look at this tree and tell me what might have caused
the
sprouting of new branches well down the otherwise unbranched trunk? What
effects have y'all noted with respect to ivy and epicormics in odd
locations like this?



https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>
<

https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>


Cheers,
Wayne



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NPS
-------- Original message --------
From: Wayne Tyson <wt750mv@xxxxxx.com>
Date: 02/11/2019 05:25 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Tree hazard potential assessment study Epicormics and Ivy

Dear lads and lassies,

Would y'all have a look at this tree and tell me what might have caused
the
sprouting of new branches well down the otherwise unbranched trunk? What
effects have y'all noted with respect to ivy and epicormics in odd
locations like this?



https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>
<

https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>


Cheers,
Wayne



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http://www.boskytrees.co.uk/<http://www.boskytrees.co.uk/><http://www.boskytrees.co.uk/<http://www.boskytrees.co.uk/>>



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To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy
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Noted that the crown periphery in parts is sparse, dying back or possible 
stages of retrenchment.
If allelopathic would this affect the main stem via lenticels or the 
competing growths below. Doubt much can survive the deep shade that Ivy gives 
so doubt the latter. Though competition for water and nutrients may stress a 
mature tree.

Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: Wayne Tyson <wt750mv@xxxxxx.com>
Date: 02/11/2019 21:44 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Tree hazard potential assessment study Epicormics and Ivy

Bill et al,

Thanks for the responses.

I'm an oddball who makes the mistake of telling it like its is (presuming
that I know), so I'm not a part of any whacking group. One of Ewel's
criteria for a restored ecosystem is "resistance to invasion." A healthy
ecosystem should be able to resist most invaders, but there seem to be
notable exceptions. H. helix doesn't seem to be much of a problem in these
parts.

Is there any evidence that ivy is allelopathic? What's the active
principle/mechanism?

I *suspect* that the humidity is higher under the ivy, and it becomes a
moisture trap.

As to the the limbed-up tree, I can't tell much from a photo either, but
the fact that buds were activated just at that one spot makes me wonder
what stimulated the buds to develop into branches. I can't see, of course,
but given the tree's age, I suspect that the branches were removed long ago
and the injuries are covered by bark. US don't do much post-failure studies
or assessments; the main priority is to tidy up (and destroy the evidence).

Best,
Wayne

On Sat, Nov 2, 2019 at 11:57 AM Bill Anderson <
anderson.arb.original@xxxxxx.com> wrote:

It looks to me like somebody made a half-hearted attempt at removing the
ivy from the lower stem.... But from this distance I wouldn't draw any
conclusions. Epicormics being produced like that, when a tree' had lower
branches removed excessively are not surprising to me.
The relationship of Ivy (Hedera helix) with its host trees in this country
Wayne, is not clear. Some sort of alellopathic deal is going down. Many
hosts seem to live quite happily with it and it never gets anywhere near
growing out of the top of the crown. Once a tree is declining it's a
different matter and stumps completely covered in Ivy (or houses) are a
fairly common sight. I'm vaguely aware that you guys have organisations
devoted to eliminating Ivy (No-Ivy League IIRC?) much as we have volunteers
attempting to wipe out Rhododendron ponticum in some areas.
Bill.

On Sat, 2 Nov 2019 at 09:54, Brewster, Ian <Ian.Brewster@xxxxxxx.co.uk>
wrote:

Looks like reaction growth (dormant buds becoming viable) to an overly
lifted crown and the ivy is exploiting the now available light.


Sent from my Samsung Galaxy smartphone.
Looks like reaction growth (dormant buds becoming viable) to an overly
lifted crown and the ivy is exploiting the now available light.


Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: Wayne Tyson <wt750mv@xxxxxx.com>
Date: 02/11/2019 05:25 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Tree hazard potential assessment study Epicormics and Ivy

Dear lads and lassies,

Would y'all have a look at this tree and tell me what might have caused
the
sprouting of new branches well down the otherwise unbranched trunk? What
effects have y'all noted with respect to ivy and epicormics in odd
locations like this?



https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>
<

https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>


Cheers,
Wayne



--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy
http://www.boskytrees.co.uk/<http://www.boskytrees.co.uk/><http://www.boskytrees.co.uk/<http://www.boskytrees.co.uk/>>
NPS
-------- Original message --------
From: Wayne Tyson <wt750mv@xxxxxx.com>
Date: 02/11/2019 05:25 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Tree hazard potential assessment study Epicormics and Ivy

Dear lads and lassies,

Would y'all have a look at this tree and tell me what might have caused
the
sprouting of new branches well down the otherwise unbranched trunk? What
effects have y'all noted with respect to ivy and epicormics in odd
locations like this?



https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>
<

https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192<https://www.google.com/maps/@40.9356569,-73.7714749,3a,75y,231.6h,98.25t/data=!3m6!1e1!3m4!1stYkZ11VFspeuTReZTvhXXg!2e0!7i16384!8i8192>


Cheers,
Wayne



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http://www.boskytrees.co.uk/<http://www.boskytrees.co.uk/><http://www.boskytrees.co.uk/<http://www.boskytrees.co.uk/>>



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NPS
 



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