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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Here in the Pacific Northwest, cottonwood are notorious for
summer limb drop or as I call it “limb popoff”. Examination of the
branch collar at the site of popoff has an odd ball and socket appearance. We
have been doing closer examinations of the cottonwood and removing branches
that have branch unions that are perpendicular to the trunk and exhibit a large
branch collar.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Nothing gets your attention like a large (14”) diameter
branch popping off a cottonwood from 60’ feet up in the middle of the
hottest day of the year at one of our well used beaches.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
canufnet-bounces@list.web.net [mailto:canufnet-bounces@list.web.net] <b>On
Behalf Of </b>Menounos, Kim<br>
<b>Sent:</b> Wednesday, June 16, 2010 11:23 AM<br>
<b>To:</b> 'Canadian Urban Forest Network'<br>
<b>Subject:</b> Re: [CANUFNET] hybrid poplar tree hazard<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We are constantly in the same philosophical debate about
Cottonwood trees in a local park. The trees are very large (same latitude as
Thunder Bay!) and old. There are no residents close by, so it’s a
much lower risk. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The reason I am weighing in is just to mention that these trees
appear to get to a point/age when their limbs become a hazard from falling. It
isn’t predictable, ie. only after a windstorm, and they are huge! We can
manage this risk because their benefit to the local riparian ecosystem is
important and the visitors to the park are less frequent. However, I personally
would not want to bear the risk of one of these trees on my private property
for this very reason! The context has to be part of the discussion. Is the
property/tree owner going to be able to predict when a large limb is going to
fall (and they will continue to fall because of the species) and be able to
mitigate the hazard by having an arborist in in time to keep someone from being
hurt? <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Kim Menounos, RPF<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>City of Prince George<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> canufnet-bounces@list.web.net
[mailto:canufnet-bounces@list.web.net] <b>On Behalf Of </b>Stephen Smith<br>
<b>Sent:</b> June 16, 2010 9:28 AM<br>
<b>To:</b> Canadian Urban Forest Network<br>
<b>Subject:</b> Re: [CANUFNET] hybrid poplar tree hazard<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
wouldn't condemn a tree just because of risk that something might/will happen
sometime in the future based on species alone. It has to demonstrate an
imminent risk of failure now. </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>That
said, I wouldn't recommend planting them if I know of these characteristics,
subject to other goals for planting that might be more important at the time.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>If
I want to remove one because of species, say a large Manitoba maple because
it's an invasive species, I will remove it on that basis not future presumed
risk, even if it has future risk of failure too but isn't imminent now. If
your municipality doesn't make allowances for invasive species or other reasons
for removal than imminent hazard, then it might get more complicated.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Stephen
Smith<br>
Urban Forest Associates Inc.<br>
Urban Forestry and Ecological Restoration<br>
<a href="http://www.ufora.ca">www.ufora.ca</a></span><o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-----
Original Message ----- <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal style='background:#E4E4E4'><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'> <a href="mailto:vince@rutterurbanforestry.ca"
title="vince@rutterurbanforestry.ca">Vince Rutter</a> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>To:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <a
href="mailto:canufnet@list.web.net" title="canufnet@list.web.net">Canadian
Urban Forest Network</a> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Sent:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> Wednesday, June 16,
2010 9:52 AM<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Subject:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> [CANUFNET] hybrid
poplar tree hazard<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<p class=MsoNormal><br clear=all>
A client's neighbour owns two large hybrid poplar (similar to cottonwood) trees
that overhang his property. They are healthy vigourous trees, both with
many codominant stems and are quite large (2 metre DBH). That's pretty
big for here in Thunder Bay! Over the past several years there have been
many occasions where branches have snapped and fallen which is typical of the
species. The branches are anywhere from 2 inches to 5 or 6 in
diameter. They are truly concerned about the tree and would like to
compel the owners to take action.<br>
At best, we could clean the crown, reduce long branches and support included
branch connections by cabling but I don't feel that would greatly reduce the
risk of occasional limb breakage. That said, have any of you condemned a
tree based on its species characteristics like these poplars? <br>
This problem comes up fairly frequently here and it usually leads to tree
removal but in this case all parties involved can't come to an agreement.
<br>
<br>
Any insight would be greatly appreciated.<o:p></o:p></p>
<p class=MsoNormal>-- <br>
Vince Rutter, RPF<br>
ISA Certified Arborist<br>
<a href="http://www.rutterurbanforestry.ca">www.rutterurbanforestry.ca</a><br>
807-627-6201<o:p></o:p></p>
</blockquote>
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