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The Visual Tree Assessment One-Third Rule: Frequently Applied, but Mostly Irrelevant


Tommy Hutchinson
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On 11/01/2020 at 10:26, Gary Prentice said:

Like most tree related 'rules', T/r is just a starting point in an assessment and shouldn't be followed blindly. Lots of veteran trees around with small crowns and a T/r of 0.1 that have stood for decades or longer. 

The only time it should be a starting point is when a tree has perfect cylindrical residual wall which is closed. And how many hollowing trees have these features?! 

 

Arborists have been using the t/R ratio for decades unbeknown to the lack of scientific credibility and its near uselessness for predicting tree failure.  

Edited by Tommy Hutchinson
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