UKTC Archive

Re: Robinia roots

Subject: Re: Robinia roots
From: Wayne Tyson
Date: Jul 12 2019 21:41:43
Again, not being there, without data, I'm just guessing. Naturally, these
trees should be stable for years to come, but pruning roots is a
fundamentally poor practice. Most tree root structures inherently possess
"system redundancy," but if one can (one can't, at least I can't) determine
the amount of force that the root system will be able to withstand (with a
"healthy" margin of error), one should not venture into the dark, dark
woods of guesswork or presumption. I would not cut any part of a root
system. What a lot of people don't realize (with the exception of y'all, of
course) is that the fine root/soil matrix that resists forces "upstream" is
what actually does most of the resisting, having a lot more holding power
than the big, thick roots that are structurally stronger (in terms of shear
for sure, but when big roots are cut, they lose all of the tensile strength
provided by the finer roots). Nay, they can be weaker in tensile
strength/resistance than the finer roots they feed. This can be readily
seen upon post-failure examinations.

I welcome refutations.

Wayne

On Fri, Jul 12, 2019 at 2:20 PM elsteadbysea <uktc@xxxxxx.tree-care.info>
wrote:

I have seen this few times with Ailanthus and Robinia on paving and
lawns.Chisling or pruning roots or anything treatment will be temporary
solution.Only solution in my opinion is to remove tree and replant a
different species.Kind regardsPhillip Ellis Sent from Samsung tablet.
-------- Original message --------From: John Hearne <johnhearne7@xxxxxx.com>
Date: 12/07/2019  12:51  (GMT+00:00) To: UK Tree Care <
uktc@xxxxxx.tree-care.info> Subject: Robinia roots Esteemed
collective,I've had to look at a Robinia that is disrupting some brick
paviouredsurfacing causing a trip hazard. The pattern of disruption showed
two rootswere causing minor lifting of bricks over lengths of about
4-5m.But there were occasional bricks lifted significantly higher and
uponremoving these bricks there was, in each case, the underlying circa
3cmdiameter root with a circa 5cm diameter swelling on top - for all the
worldreminiscent of an emerging pneumatophore.I would expect, if anything,
maybe flattening in regions of contact withthe paving. But waht are these
structures? Sucker initials? ENORMOUSN-fixing nodules?I am going to suggest
chiselling them off to bet the bricks back flat - butthought I ought to
know what they were?Help appreciated.John-- Hearne
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