UKTC Archive

RE: Robinia roots

Subject: RE: Robinia roots
From: Pedro Álvaro
Date: Jul 12 2019 12:54:47
Hi John,

Could be helpful some photos to illustrate that case. But I think that I've 
understood well, and how I've never observed or listen that Robinia would 
have pneumatophores (so their habitat is not flooded, at least in our area). 
I think that types of structures are "cushion formation" of roots between 
compacted soil and bricks. They are a result of reaction of forces (pass of 
pedestrians vehicles, etc...). We have observed similar structures in Pinus 
and in other genera, maybe could be similar a pneumatophores because Robinia 
tends to make shoots from roots.

I hope to have been helpful.

Regards,

Pedro Alvaro

pedro@xxxxxxxxxxxx.com

-----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 13:52
Para: UK Tree Care
Asunto: Robinia roots

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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