[CANUFNET] Dutch Elm Disease tolerance

[via CANUFNET]

They died of DED.  No damage from construction, or there was no construction just forest thinning. A response to a change in growing conditions in their immediate area (I would think an improvement but the trees didn’t think so).

Stephen Smith
Urban Forester, ISA Certified Arborist
Qualified Tree Risk Assessor
Urban Forest Associates
www.ufora.ca
off 416-423-3387/cell 416-707-2164


From: Brad 
Sent: Thursday, August 09, 2018 8:03 PM
To: stephen at ufora.ca ; Canadian Urban Forest Network 
Cc: Alison Bond 
Subject: Re: [CANUFNET] Dutch Elm Disease tolerance

Did they die of DED? Or construction related issues? 
Any stress has lead to increased DED activity my experience 

Beetle habitat and activity increases and DED also increases. Hence the bans on pruning during active beetle periods.




Brad 

On Aug 8, 2018, at 10:25 AM, via CANUFNET <canufnet at list.web.net> wrote:


  We have carried out some projects thinning urban forests with a mix of native/non-natives including healthy mature white elms and had the elms die soon after thinning and replanting. Also seen this after construction, even when they were well protected during construction.

  Stephen Smith
  Urban Forester, ISA Certified Arborist
  Qualified Tree Risk Assessor
  Urban Forest Associates
  www.ufora.ca
  off 416-423-3387/cell 416-707-2164


  From: Alison Bond via CANUFNET 
  Sent: Tuesday, August 07, 2018 2:31 PM
  To: canufnet at list.web.net 
  Subject: [CANUFNET] Dutch Elm Disease tolerance

  Hello Canufnet:

  Do you know of any research that indicates whether resistance to DED is affected by tree health/vigour?  Much of what I can find indicates that trees are being selected based on their resistance to DED but it isn't clear if the tree is just not susceptible to DED or whether it is actively fighting the disease.  If the latter, one would expect that the tree would be more prone to infection when it has been otherwise compromised (e.g., new sidewalk cut into its roots.)  Thoughts?

  Thank you.
  Alison


  Alison Bond BSc MSc BLA   OALA  CSLA

  Landscape Architect and Certified Arborist


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