[CANUFNET] [External email] Question to mailing list members

[Mike Jenkins]

In general, I would think that the wound generated by removing the
epicormic growth would be a greater attractant and a greater risk of entry
for the beetles than leaving the growth in place.

The epicormic growth itself could be an indicator of where vascular
blockage is occurring - potentially due to gallery formation or
fungal growth.  The growth then would be a response to an infestation or
injury that already occurred, and not the causative agent of the gallery or
fungus.  The weaker connections of epicormic growth would also be more
vulnerable to being removed accidentally by wind or other factors, again
potentially creating an entry point for the beetles.  For these reasons a
tree with epicormic growth should be a target of increased monitoring and
surveillance.

On Fri, 5 Mar 2021 at 13:14, Russell Eirich via CANUFNET <
canufnet at list.web.net> wrote:

> Epicormic growth probably means there is some factor causing decline in
> the overall tree health.  This would then correspond to a possible
> increased beetle predation with vector transmission of DED.
>
>
>
> Just a thought - But I don’t have documented proof either.
>
>
>
> Regards
>
> Russell
>
>
>
> *From:* CANUFNET <canufnet-bounces at list.web.net> *On Behalf Of *SOS Trees
> Coalition via CANUFNET
> *Sent:* Friday, March 5, 2021 1:31 PM
> *To:* canufnet at list.web.net
> *Cc:* SOS Trees Coalition <trees at sostrees.ca>
> *Subject:* [External email] [CANUFNET] Question to mailing list members
>
>
>
> Here is a question that I would like to have posted to the subscribers:
>
>
>
> Has anyone heard of the need to remove watersprouts from American Elm
> trunks because they could be a source of entry for the elm bark beetle?  We
> have been alerted to this by a university researcher who claims that
> leaving this growth on elms can leave them vulnerable to Dutch Elm disease.
> I have never heard of this and want to know if anyone has information to
> support it.
>
>
>
>
>
> Linda Moskalyk
>
> President
>
> SOS Trees Coalition
>
> Saskatoon
>
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> .
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Mike Jenkins

PEST COORDINATOR
ANIMAL CARE & PEST MANAGEMENT

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