UKTC Archive

RE: Contact Stress Response

Subject: RE: Contact Stress Response
From: Jim Quaife
Date: Sep 13 2018 12:08:58
The photos were taken at the time and about 2 years afterwards, but in those 
days
(mid 90s) I didn't really have much of an index system.
As I recall the trees were of much the same size as yours and Norway maple, 
but the care with which one extracts the metalwork is imperative.  The trick 
is to smash off the outer part of the grille and try and crack the ring 
against the tree at the less deeply embedded (or nor embedded) parts, and 
then gently wiggle (hope this is not too technical for you) each part from 
the tree.  (I do remember that with one of them, one half came away in one 
piece).  I also recall that some cambium damage was inevitable, but frankly, 
if just in a few localised positions would still be less disruptive than 
grafts.
Jim

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of Brewster, Ian
Sent: 13 September 2018 12:44
To: UK Tree Care
Subject: RE: Contact Stress Response

Thank Jim, what would your photos show other than a dark recess where the 
cast girdle is located.
If they are of the recovered tree then brilliant. Do you recall the species 
and girth (I guess this is universal around the 35-45cm diameter)?
Thank Jim, what would your photos show other than a dark recess where the 
cast girdle is located.
If they are of the recovered tree then brilliant. Do you recall the species 
and girth (I guess this is universal around the 35-45cm diameter)?

From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Jim Quaife
Sent: 13 September 2018 12:40
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: Contact Stress Response

The chances are that the grille is cast iron. If so it is brittle and can be 
broken with a hammer (slip something underneath the impact points so that 
there is no leverage damage to the tree). Clearly the cambium is still 
functional so if done with care and the wound protected with hessian, the 
tree will survive and the wound will recover. I have done this many moons ago 
on 3 trees but I haven't got time to plunge into archives for photographs.
Jim
NPS
 From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info> On Behalf Of Jim Quaife
Sent: 13 September 2018 12:40
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: Contact Stress Response

The chances are that the grille is cast iron. If so it is brittle and can be 
broken with a hammer (slip something underneath the impact points so that 
there is no leverage damage to the tree). Clearly the cambium is still 
functional so if done with care and the wound protected with hessian, the 
tree will survive and the wound will recover. I have done this many moons ago 
on 3 trees but I haven't got time to plunge into archives for photographs.
Jim



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