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<p class="MsoNormal"><span style="color:#1F497D">Hello Emily,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Just to add to Julian’s comments if you want some further documentation the following link has some Best Management Practices for edge treatments starting about page 7-28.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="https://www.for.gov.bc.ca/ftp/hbt/external/!publish/web/ems2/BCTS-Coastal-Windthrow-Manual.pdf">https://www.for.gov.bc.ca/ftp/hbt/external/!publish/web/ems2/BCTS-Coastal-Windthrow-Manual.pdf</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Ken<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<span style="color:#1F497D;mso-fareast-language:EN-CA"><img border="0" width="210" height="74" id="Image_x0020_1" src="cid:image008.png@01D08BCB.DBAC0490" alt="Description : cid:image004.png@01CBBBDD.C07E2490"></span><span style="color:#1F497D;mso-fareast-language:EN-CA"><o:p></o:p></span></p>
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<b><span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:green;mso-fareast-language:FR-CA">Ken Byrne, PhD, RPF</span></b><b><span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:green;mso-fareast-language:EN-CA"><o:p></o:p></span></b></p>
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<span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#336600;mso-fareast-language:FR-CA">Researcher / Chercheur<o:p></o:p></span></p>
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<span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#336600;mso-fareast-language:FR-CA">Forest Operations Division /
</span><span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#336600;mso-fareast-language:EN-CA">Division des opérations forest</span><span lang="FR" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#336600;mso-fareast-language:EN-CA">ières</span><span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#336600;mso-fareast-language:EN-CA"><o:p></o:p></span></p>
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<span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR-CA">2665 East Mall, Vancouver, BC V6T 1Z4<o:p></o:p></span></p>
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<span style="font-size:8.0pt;font-family:Wingdings;mso-fareast-language:FR-CA">(</span><span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR-CA"> 604-222-5709<o:p></o:p></span></p>
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<span style="font-size:8.0pt;font-family:Wingdings;mso-fareast-language:FR-CA">+</span><span style="font-size:8.0pt;mso-fareast-language:FR-CA">
</span><span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR-CA"><a href="mailto:Ken.Byrne@fpinnovations.ca">Ken.Byrne@fpinnovations.ca</a><o:p></o:p></span></p>
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<span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR-CA"><a href="http://www.fpinnovations.ca/">www.fpinnovations.ca</a><o:p></o:p></span></p>
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<b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:green;mso-fareast-language:EN-CA"><img border="0" width="42" height="41" id="_x0000_i1032" src="cid:image009.png@01D08BCB.DBAC0490"></span></b><b><span lang="FR-CA" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:green;mso-fareast-language:FR-CA"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:EN-CA">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:EN-CA">
CANUFNET [mailto:canufnet-bounces@list.web.net] <b>On Behalf Of </b>Julian Dunster<br>
<b>Sent:</b> May-11-15 9:12 AM<br>
<b>To:</b> canufnet@list.web.net<br>
<b>Subject:</b> Re: [CANUFNET] spiral pruning<o:p></o:p></span></p>
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</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In the Lower Mainland of BC a few of us initiated spiral pruning as a technique to reduce the likelihood of windthrow, in the early 90's. Initially it was mainly Douglas-firs, hemlocks, and redcedars along new edges as development occurred.
Later it was tried on isolated trees. <br>
<br>
As an edge treatment for newly exposed trees in a forest it works well. It opens up the edge to be more 'porous' and the wind dissipates back into the forest stand without triggering windthrow. As a treatment for individual trees trees it is less successful,
and on Douglas-fir, very harmful. When we started it over two decades back, we had heard a little about branch clashing, wind sail etc and it seemed a logical approach. It turns out that, at least in Douglas-fir, the branches need to clash. When they were
removed as part of spiral pruning they moved a lot more in strong winds and increased branch failure resulted, which in turn allowed other branches to move more and encouraged additional branch failure. I recall seeing isolated Douglas-firs that had been
spiral pruned, looking very motheaten years later, with massive amounts of limbs broken off. The trees not touched seemed just fine and few had fallen down.<br>
<br>
These days I would not prescribe spiral pruning for an individual tree that is isolated. I would still recommend it as part of edge treatment for newly exposed trees (any species) in forest conditions. It should not be prohibited in all circumstances. Like
many treatments there is a time and place where it can be very effective as means of meeting defined management goals.
<br>
<br>
<o:p></o:p></p>
<pre>On Behalf of Dunster and Associates Environmental Consultants Ltd.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Dr. Julian A Dunster R.P.F., R.P.P.., M.C.I.P., ISA Certified Arborist,<o:p></o:p></pre>
<pre>ASCA Registered Consulting Arborist # 378, <o:p></o:p></pre>
<pre>ISA Tree Risk Assessment Qualified<o:p></o:p></pre>
<pre>BC Wildlife Danger Tree Assessor<o:p></o:p></pre>
<pre>Honourary Life Member ISA + PNWISA<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><a href="http://www.dunster.ca">www.dunster.ca</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Distributor for Air Spade. <a href="http://www.air-spade.com">www.air-spade.com</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>North American Distributor for Rinntech equipment. <a href="http://www.rinntech.com">www.rinntech.com</a> <o:p></o:p></pre>
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<p class="MsoNormal">On 11/05/2015 8:47 AM, Hamilton, Emily wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;background:white;mso-fareast-language:EN-CA">Good morning,</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;mso-fareast-language:EN-CA"> </span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;mso-fareast-language:EN-CA">We are looking into justification for or against spiral pruning here at the City of Surrey and I was wondering
if anyone had any experience or documentation that they'd like to share related to this. Any thoughts? </span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;mso-fareast-language:EN-CA"><br>
Thank you,<br>
Emily</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-fareast-language:EN-CA">Regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-fareast-language:EN-CA">Emily</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:9.0pt;color:#404040;mso-fareast-language:EN-CA">Emily Hamilton | Environmental Technician - Arboriculture<br>
<br>
<img border="0" width="200" height="73" id="Picture_x0020_1" src="cid:image001.png@01D08BCB.887A4200" alt="COS_Tag_pp_cmyk-200"></span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:6.0pt;color:#76923C;mso-fareast-language:EN-CA"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;color:#76923C;mso-fareast-language:EN-CA">CITY OF SURREY</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#999999;mso-fareast-language:EN-CA">Trees and Landscape Section, Building Division – Planning and Development</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#999999;mso-fareast-language:EN-CA">13450 104th Ave, Surrey, BC, Canada V3T 1V8<br>
T 604.591.4560 </span><span style="color:#1F497D;mso-fareast-language:EN-CA"><a href="http://www.surrey.ca/"><span style="font-size:9.0pt;color:#76923C">www.surrey.ca/treeprotection</span></a></span><span style="font-size:9.0pt;color:#76923C;mso-fareast-language:EN-CA">
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:6.0pt;color:#76923C;mso-fareast-language:EN-CA"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt;color:#76923C;mso-fareast-language:EN-CA">Connect, Share and Engage with your City</span></b><o:p></o:p></p>
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