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<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>
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<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>Ken Snowden<br>
<b>Sent:</b> Thursday, October 03, 2013 9:32 AM<br>
<b>To:</b> canufnet@list.web.net<br>
<b>Subject:</b> [CANUFNET] Aphid thresholds<o:p></o:p></span></p>
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<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>
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