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

[stephen at ufora.ca]

They must be thinking that since the beetles chew away at the top of the branches where they meet the stem that more branches means more chewing so more chances to introduce the fungus into the tree.

 

Stephen Smith

Urban Forest Associates

Urban Forestry & Ecological Restoration

www.ufora.ca

Office/fax 416-423-3387

Cell 416-707-2164

 

From: CANUFNET <canufnet-bounces at list.web.net> On Behalf Of Mike Jenkins via CANUFNET
Sent: March 5, 2021 3:40 PM
To: Canadian Urban Forest Network <canufnet at list.web.net>
Cc: Mike Jenkins <mike.jenkins at edmonton.ca>
Subject: Re: [CANUFNET] [External email] Question to mailing list members

 

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 <mailto: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 <mailto: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 <mailto:canufnet at list.web.net> 
Cc: SOS Trees Coalition <trees at sostrees.ca <mailto: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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