UKTC Archive

Re: Non invasive cable brace

Subject: Re: Non invasive cable brace
From: Jerry Ross
Date: Dec 22 2006 09:21:38
(I'm supposed to have signed off for the duration - just can't seem to keep away from the old UKTC !)

Scott Cullen wrote:
OK, I undertsand your point now.  Do you recall in the walnut cabling 
actualli initiated the decay?  Or was there evidence the decay pre-existed 
and the hardware installation allowed it to spread?
There were zones of dead bark spreading from around each insertion point - oval areas of necrotic (and in some cases decaying) tissue on both sides where the bolts passed through; they weren't present other than at the bolt insertions and as far as I was concerned provided a very positive correlation between making holes in walnut and causing damage to develop.
The real point is how long the cabling extended the life of the tree.
In this case I was called in to take down the tree because a branch had failed at the cable attachment - i.e. the cabling had effectively shortened the tree's life.
If a non-invasive brace extends it longer at an acceptable cost it is - in those repects anyway - superior.
I quite agree... for walnut and a few other decay-prone species. (Horse chestnut is another I'd be dubious about, especially using eye-screws). But in most (over here, anyway) species , I'd still say that if you need a cable that's going to be effective over a long period and be unobtrusive, fit steel.

----- Original Message ----- From: Jerry Ross To: UK Tree Care Sent: Thursday, December 21, 2006 12:00 PM
  Subject: Re: Non invasive cable brace

On the other hand, the point I was trying to make about decay-prone species was not that one should anticipate decay by bracing, but that drilling holes will CAUSE (or rather permit) decay. In those cases I'd certainly agree that non-invasive is better. I remember taking down a Walnut with three cables fitted and at each bolt insertion there was bark death and decay, with one branch having broken at that point... (And as far as I recall, that was a case where the tree's original structure wasn't such that the braces were needed in the first place. The cabling had actually caused its demise!)

J.P.ROSS B.Sc. F.Arbor.A Arboricultural Association Registered Consultant
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