[CANUFNET] Dutch Elm Disease tolerance

[Brad via CANUFNET]

We're there other Elms removed ?
Debris and stumps are attractive to beetles 

Also root graft transmission can occur after diseased trees are removed, so one tree could potential infect several neighbors 

Brad 

> On Aug 9, 2018, at 8:30 PM, <stephen at ufora.ca> <stephen at ufora.ca> wrote:
> 
> 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
>> 
>> ENVISION-TATHAM Inc.   
>> 115 Sandford Fleming Drive, Suite 200, Collingwood, L9Y 5A6
>> abond at envision-tatham.com I  Tel: 705.445.0422  I  Fax: 705.444.2327  I  Cell: 705.994.2059 I   www.envision-tatham.com
>>  
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