<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><base href="x-msg://106/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi ANderw:<div><br></div><div>Field experience is the very best research so appreciate your sharing as will be helpful for future reference.</div><div><br></div><div>Elms are not the only urban tree species that have had this issue. Pyrus calleryana 'Bradford" was a great tree for many reasons but notorious for falling apart with approaching maturity due to branch angle / included bark issues.</div><div><br></div><div>Do you have an idea why, when these cultivars are developed, this issue is not taken into account more often? What's the point in specifying trees that you know will fail with maturity? Better to never use and that is certainly a "no win" for the developer or the nurseries selling the species.</div><div><br></div><div>Wastes a lot of time effort and money.</div><div><br></div><div>Kind regards</div><div>naomi<br><div><div>On Jan 11, 2018, at 8:17 AM, Andrew Boyd via CANUFNET <<a href="mailto:canufnet@list.web.net">canufnet@list.web.net</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="EN-CA" link="blue" vlink="purple" style="font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Hi Alison,<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">As someone who has been heavily involved in the work around Parliament Hill in Ottawa I can tell you that the predominant cultivar (clone) used has been ‘Liberty’ and not ‘Accolade’ (at least in the case of the elms planted adjacent to the US Embassy not far from the hill). Like many elms developed in response to Dutch elm disease it seems they do have a tendency to form poor unions (in particular with included bark). Ultimately of course this can lead to failure as the trees mature. <o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">On another recent project in Ottawa this was also an issue for a number of ‘Valley Forge’ trees, none of which were over 15cm in diameter. From what I could tell in this instance they were victims of their own success - growing so rapidly that pruning couldn’t keep them in good form. It sounds as though your clients are experiencing the same issue. <o:p></o:p></span></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Andrew K. Boyd, R.P.F.<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Consulting Urban Forester<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">IFS Associates Inc.<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">P.O. Box 13593<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Ottawa, ON<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">K2K 1X6<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Tel: 613-839-0101<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Fax: 613-839-0114<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><a href="http://www.ifsassociates.ca" style="color: purple; text-decoration: underline; ">www.ifsassociates.ca</a><o:p></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(225, 225, 225); padding: 3pt 0in 0in; "><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; ">From:</span></b><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; "><span class="Apple-converted-space"> </span>CANUFNET [mailto:canufnet-<a href="mailto:bounces@list.web.net" style="color: purple; text-decoration: underline; ">bounces@list.web.net</a>]<span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b>Alison Bond via CANUFNET<br><b>Sent:</b><span class="Apple-converted-space"> </span>Tuesday, January 9, 2018 4:46 PM<br><b>To:</b><span class="Apple-converted-space"> </span><a href="mailto:canufnet@list.web.net" style="color: purple; text-decoration: underline; ">canufnet@list.web.net</a><br><b>Subject:</b><span class="Apple-converted-space"> </span>[CANUFNET] Elms and breakage<o:p></o:p></span></div></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div><div id="GroupWiseSection_1515533498000_ABOND@envision-tatham.com_6D9784A083F10047889340061400B217_"><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; ">All:<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; "> </span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; ">At a conference in Quebec City I learned that much of the areas around the parliament buildings were being planted with Accolade Elm with good success. After that conference we started incorporating elms into our street tree planting plans. Accolade wasn't always available so there were often substitutions (Valley Forge, Princeton, Pioneer, Triumph.)<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; "> </span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; ">I have recently noticed that some of the elms (when reaching about 15.0 cm dbh) are starting to break apart and large branches are failing. Many of these elms are vigorous growers and municipalities haven't been able to keep up with pruning to keep the form strong.<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; "> </span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; ">Has anyone else noticed this predisposition to breakage? <o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; "> </span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; ">Thanks.<o:p></o:p></span></div></div><div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; ">Alison<o:p></o:p></span></div></div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; "><br><br></span><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><o:p></o:p></span></p><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: Calibri, sans-serif; ">Alison Bond </span><strong><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; color: gray; ">BSc MSc BLA OALA CSLA</span></strong><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><o:p></o:p></span></p><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><strong><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; color: gray; ">Landscape Architect and Certified Arborist</span></strong><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><o:p></o:p></span></p></div></div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "> </span></p><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><strong><span style="font-size: 10pt; font-family: Calibri, sans-serif; ">ENVISION-TATHAM Inc.</span></strong><strong><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; "> </span></strong><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; "> </span><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><o:p></o:p></span></p></div><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; ">115 Sandford Fleming Drive, Suite 200, Collingwood, L9Y 5A6</span><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><o:p></o:p></span></p></div><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; color: fuchsia; "><a href="mailto:abond@envision-tatham.com" style="color: purple; text-decoration: underline; ">abond@envision-tatham.com</a></span><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; "><span class="Apple-converted-space"> </span>I Tel: 705.445.0422 I Fax: 705.444.2327 I Cell: 705.994.2059 I </span><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><a href="http://www.envision-tatham.com" style="color: purple; text-decoration: underline; "><span style="font-size: 7.5pt; font-family: Calibri, sans-serif; ">www.envision-tatham.com</span></a><o:p></o:p></span></p></div><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: Calibri, sans-serif; "> </span><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><o:p></o:p></span></p></div><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="EN-US" style="font-size: 8pt; font-family: Calibri, sans-serif; ">This email may contain confidential and/or privileged information for the sole use of the intended recipient. Any review or distribution by others is strictly prohibited. If you have received this email in error, please contact the sender and delete all copies.</span><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "><o:p></o:p></span></p></div><div><p class="MsoNormal" style="margin: 0in 0in 3.75pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; "> </span></p></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Segoe UI', sans-serif; "> </span></div></div></div></div></blockquote></div><br></div></body></html>