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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple>Bowdan is correct. Never recommend the removal of a putitively resistant, or resilient tree to any disease or insect attack. There are always some trees (<5%) in a population that will pass on genetic resistance to the next generation. Saying all this, we must consider that the larger beech trees will not 'canker' similar to the regenerating trees which will be more deformed. Older, larger >60 cm dbh trees will likely have the initial population of beech scale when they first invade the area. That population of scale will subside over time and the two Nectria fungi responsible for bbd will then kill the trees over a number of years. The whole process is 10+ years or more.<br/>There is lots of information on bbd out there. <br/>Ed Czerwinski<br/>Forestree Care<div>Sent on the TELUS Mobility network with BlackBerry</div><hr/><div><b>From: </b> "Koskinen, Jennifer" <Jennifer.Koskinen@stantec.com>
</div><div><b>Sender: </b> canufnet-bounces@list.web.net
</div><div><b>Date: </b>Fri, 24 Feb 2012 13:34:36 -0700</div><div><b>To: </b>canufnet@list.web.net<canufnet@list.web.net></div><div><b>ReplyTo: </b> Canadian Urban Forest Network <canufnet@list.web.net>
</div><div><b>Subject: </b>[CANUFNET] Beech Bark Disease</div><div><br/></div><div class=WordSection1><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Good day,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>To cut or not to cut? Beech Bark Disease (scale and fungus = canker) is destroying our beech trees. I have observed cankering on many American Beech (<i>Fagus grandifolia</i>) trees in forests throughout Southern Ontario. I would definitely recommend a tree (located in/adjacent to a public/residential area) in poor condition with this canker to be removed. But what about removing trees that appear to be in good condition, minimal to no deadwood in crown, no observed rot on the stem, But with minimal signs of infection on the bark? Without knowing how long these ‘good condition’ trees with small patches of infection will survive should we go ahead and remove them to be proactive? Or retain them and possibly have them die in one or two years becoming a hazard tree?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>What do you guys think? Are there any pathology tree experts out there?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-jk<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Jennifer Koskinen, HBESfcon</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><br>ISA Certified Arborist ON-1234A<br>Stantec<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>49 Frederick Street<br>Kitchener ON N2H 6M7<br>Ph: (519) 585-7442<br>Fx: (519) 579-8664<br>jennifer.koskinen@stantec.com<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:13.0pt;font-family:"Arial Narrow","sans-serif"'><a href="http://www.stantec.com"><b><span style='color:#993333;text-decoration:none'>stantec</span></b><span style='color:#003F6E;text-decoration:none'>.com</span></a> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:13.5pt;font-family:Webdings;color:#008040'>ü</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> </span><span style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";color:#008040'>Please consider the environment before printing this email.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'> </span><o:p></o:p></p></div></body></html>