UKTC Archive

Re: Robinia roots

Subject: Re: Robinia roots
From: Wayne Tyson
Date: Jul 12 2019 14:34:28
Esteemed collective, John Hearne and Pedro Alvaro:

Tree roots can expand with great force over time as they grow larger in
diameter--correct? If a root is growing over an obstacle or more resistant
object below than the one (pavior?) above it, the one above it has to give
way to the greater force--correct?

Even if the resistance on both sides is the same, would not the mere
expansion of the root diameter be sufficient to cause the (non) confining
object on top to be moved upward enough to cause a trip hazard? Would
chiseling the root weaken the root system (either directly or indirectly)?

Wayne

On Fri, Jul 12, 2019 at 7:07 AM Pedro Álvaro <pedro@xxxxxxxxxxxx.com> wrote:

Hi John,

Observing the picture, I reaffirm that types of structures are "cushion
formation" of roots between compacted soil and bricks, result of reaction
of forces (pass of pedestrians),  and how says Kevin Slezacek too:
"callous formation from damage from the paving".

Best regards,

Pedro Alvaro

-----Mensaje original-----
De: uktc-request@xxxxxx.tree-care.info [mailto:
uktc-request@xxxxxx.tree-care.info] En nombre de John Hearne
Enviado el: viernes, 12 de julio de 2019 15:59
Para: UK Tree Care
Asunto: Re: Robinia roots

Hi Wayne - it's dark, moist and airy under the paviours. Suits roots sir!

On Fri, Jul 12, 2019 at 2:37 PM Wayne Tyson <wt750mv@xxxxxx.com> wrote:

Esteemed John Hearne:

What is the cause of the surface development of the root system?

Wayne

On Fri, Jul 12, 2019 at 4:52 AM John Hearne <johnhearne7@xxxxxx.com>
wrote:

Esteemed collective,

I've had to look at a Robinia that is disrupting some brick pavioured
surfacing causing a trip hazard. The pattern of disruption showed two
roots
were causing minor lifting of bricks over lengths of about 4-5m.

But there were occasional bricks lifted significantly higher and upon
removing these bricks there was, in each case, the underlying circa 3cm
diameter root with a circa 5cm diameter swelling on top - for all the
world
reminiscent of an emerging pneumatophore.

I would expect, if anything, maybe flattening in regions of contact
with
the paving. But waht are these structures? Sucker initials? ENORMOUS
N-fixing nodules?

I am going to suggest chiselling them off to bet the bricks back flat -
but
thought I ought to know what they were?

Help appreciated.

John

--

Hearne Arboriculture

www.hearnearboriculture.com



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