UKTC Archive

RE: VTA & Decay Mapping

Subject: RE: VTA & Decay Mapping
From: dscottcul
Date: Dec 31 2002 12:50:42
2 points to contribute here...

I think we've debated this one before Bill, where I argued that old/mature
trees that survive topping probably do so 'despite' the treatment, not
because of it.  

But that's the point isn't it?  Some do survive despite severe crown 
reduction.  A suggestion that all will succomb is not in fact true.  So this 
points to developing an understanding of what tree characteristics or work 
considerations (timing, %redeuction/year, etc.) will allow survival.  And 
remember to distinguish physiological from structural survival.  If the 
choice 
is "fell it to be safe" or "top it and see if it makes it" maybe some 
individuals do survive because of the reduction.

And the brief period which we administer trees is commonly a
fairly short period relative to their lifetime.  So their vulnerability to a
premature demise, as a consequence of such work might not be so apparent

Sorry if I repeat here... the same consideration applies to drilling for 
decay 
mapping.  I started out suggesting that there may well be times when VTA is 
insufficient for decision making and a "decay map" is desirable.  I would 
hope 
tomographic methods become reliable enough to offer an alternative to 
drilling.  I have little issue with drilling some roadside tree where safety 
is 
the principal concern.  I have great issue if we are dealing with 
some "veteran" of great cultural significance.  If drilling reduces its 
lifespan by 100 years three of us will have retired and it's likely the third 
will not recall what the first did, but IMO it's not acceptable... well not 
desirable anyway... to deprive three generations of that cultural assest.
 
--
Scott Cullen


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