<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"Century Gothic";
panose-1:2 11 5 2 2 2 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle21
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Thanks Ian,<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'>The reference is interesting and mimics some of the conclusions we have observed.<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'>We react to call levels/numbers. Individual streets have learned this strategy and will have each resident on the street phone in requesting resolution to the problem. This has become cyclical and we now expect their calls, prompting their expectation of a crews arrival to alleviate their problem. Mere blocks away, trees dripping in honeydew prompt no calls at all. Is it fair that we respond only to those that complain? I would prefer to implement a system that would see us address the issue using quantifiable data, rather than customer complaints. This is why we are looking to develop a baseline threshold which we can fall back on to. <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'>Thanks for the advice..<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'>Ken<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'><o:p> </o:p></span></p><p class=MsoNormal><span style='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 [mailto:canufnet-bounces@list.web.net] <b>On Behalf Of </b>Ian Wilson<br><b>Sent:</b> Thursday, October 03, 2013 2:36 PM<br><b>To:</b> 'Canadian Urban Forest Network'<br><b>Subject:</b> Re: [CANUFNET] Aphid thresholds<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></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><p class=MsoNormal><span style='color:#1F497D'>If you want to go with something that’s more scientific, you could try monitoring honeydew droplets using the methodology of Steve Dreistadt, see this reference:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="http://joa.isa-arbor.com/request.asp?JournalID=1&ArticleID=2237&Type=2">http://joa.isa-arbor.com/request.asp?JournalID=1&ArticleID=2237&Type=2</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'>I’ve used this technique before and it works well, but it’s more time consuming because you have to hang out monitoring cards and then go collect them again. In practice, I think many cities just rely mostly on complaints – in part because it’s less time consuming than having a systematic monitoring program, but also because tolerance thresholds vary widely. Even within the same city, some neighborhoods may tolerate a lot more honeydew than other neighbourhoods.<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'>Ian Wilson<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>City of Kelowna<o:p></o:p></span></p><p class=MsoNormal><span style='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 <a href="mailto:[mailto:canufnet-bounces@list.web.net]">[mailto:canufnet-bounces@list.web.net]</a> <b>On Behalf Of </b>Ken Snowden<br><b>Sent:</b> Thursday, October 03, 2013 9:32 AM<br><b>To:</b> <a href="mailto:canufnet@list.web.net">canufnet@list.web.net</a><br><b>Subject:</b> [CANUFNET] Aphid thresholds<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Good morning all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>After a trying year with a prolonged drought, we saw a dramatic increase in calls regarding aphids and issues with the accompanying honeydew. We are seeking input on thresholds for aphid damage on street trees to develop a baseline for our IPM program. I have received information from a few neighboring cities, and have found varying responses that range from budget availability to number of phone calls. Most online information I find tends to lean towards agricultural crops rather than urban forestry. We want to help educate our residents and spray only as a last resort but need a well-founded number to use as a baseline. City of Surrey responded that they use number of aphids per leaf…what are other municipalities using?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Your help would be appreciated,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif";color:#365F91'>Ken Snowden<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Century Gothic","sans-serif";color:#4F6228'>Arbourist II<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Century Gothic","sans-serif";color:#4F6228'>City of Abbotsford Parks, Recreation and Culture</span></b><span style='font-family:"Century Gothic","sans-serif";color:#4F6228'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif";color:black'>Phone: <b>(604) 853 5485 ext. 5886</b><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif";color:black'>Cell: <b>(604) 626 3945</b> <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif";color:black'>Email: <b><a href="mailto:ksnowden@abbotsford.ca">ksnowden@abbotsford.ca</a></b></span><b><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif";color:black'><o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><i>‘To exist as a nation, to prosper as a state, to live as a people, we must have trees’<o:p></o:p></i></p><p class=MsoNormal>Theodore Roosevelt<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>