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

[SOS Trees Coalition]

Yes I had the same thought about removal of that growth.  That would be
more of an entry point than if it were left alone.
We have always had a number of American elms with epicormic growth here in
Saskatoon and they don't necessarily look unhealthy or stressed.
I am not sure why this researcher seems to think it is a problem.  We will
look into it a little more.
So far we have only had 2 cases of DED here.  We are crossing our fingers
that it can be detected early  if we get another. Both trees in different
areas of the city were removed promptly with no more cases so far.

Linda Moskalyk
SOS Trees Coalition
https://www.sostrees.ca/index.html

On Fri, Mar 5, 2021 at 4:22 PM Mike Jenkins via CANUFNET <
canufnet at list.web.net> wrote:

> 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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