UKTC Archive

Re: Swamp Cypress

Subject: Re: Swamp Cypress
From: Wayne Tyson
Date: Nov 22 2021 20:19:21
Oisin,

Just a thought for what it might be worth. In general, the failure of
apparently perfect branches can be laid to weight and moment-arm. I vaguely
remember reading a paper from Australia decades ago about cross-grain
checking in some eucalypts. A close inspection of the break can sometimes
reveal a lot. Cross-checking usually produces bundles of wood fiber that
appear to have been severed at about 90 degrees. Those that have failed due
to lateral forces should show evidence of compression on the bottom and
tension on the top. Can you attach a photo of the end of the broken branch?

WT

On Mon, Nov 22, 2021 at 4:34 AM Oisin Kelly <oisin@xxxxxxxxxxx.co.uk> wrote:

Thoughts please.

I have been looking at a large swamp cypress (25m tall, 125cm DBH). It
was previously twin stemmed, but one of the stems was truncated at 4m.
Image attached.

In the past few years, it has shed several branches  - around 2 to 4m
long, with basal diameter up to 150mm. After each occasion, I have
inspected, but have not found any sign of disease, dysfunction that
might alert one to further failures. I suspect, this may be something
typical of the species and age. Does anyone have knowledge or experience
of this? Also, any ideas on what pruning might be reasonably carried out
to reduce the risk of branch failure - the short side branches do not
seem to lend themselves to lateral reduction.

Thanks

--

Oisin



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