Elm leaves, header

Quarterly Newsletter                           June 2011

  Hi Neighbor!
In This Issue
Tree Inoculation
Spring Fundraiser
A New Direction


Elms Update

 American elm leaf
Q1/Q2, 2011 Activity

It's too early in the season to confirm new instances of Dutch elm disease.  We remain on the lookout and will provide an update in our next newsletter.



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Inoculation This Saturday - Join Us!


Where: : Palios Elm Room, Ladd Circle

When : Saturday, June 25, 8:00 am to ~12:00 pm


SOE's annual elm tree inoculation happens this Saturday.  Please join us and your neighbors for this important event.  Inoculation has had a significant positive impact on saving the majestic elms that grace Ladd's Addition.


 Please wear long sleeves, pants and bring gloves. If you can, please also bring pruners and a (charged) cordless drill.  SOE will provide drill bits.


Lunch will be provided following completion of our inoculation efforts.  Have a slice or two or pizza with your neighbors.


Contact Toby Deming at to volunteer, or simply show up this Saturday.  We look forward to seeing you then.




Spring Fundraising Update


Thank you very much for your financial support.  We've raised $7,500 thus far this season to cover costs associated with inoculation, planting, stump removal and pruning.  It's essential work that improves the value and beauty of our neighborhood.  Member support has enabled us to successfully protect our elms and plant over 600 new trees to replace lost trees and build the Ladd canopy.


Please make a donation today!  We need to reach the $9,000 mark to cover this year's costs.  Individual contributions make up more than two thirds of SOE's annual budget and are the foundation of the program's success.  You can help the pledge drive by making a tax-deductible contribution online or by sending a check to: Save Our Elms, 1630 SE Elliott Ave., Portland, Oregon  97214.  



Inoculation - A New Direction


For the past seventeen years, the neighborhood has rallied behind SOE's efforts to protect our heritage trees from Dutch elm disease (DED).  Volunteers have applied over 50,000 microinjectors at a cost of over $200,000.  We're confident these efforts have slowed the spread of DED, but the tree loss rate in the past three years has been cause for concern and is prompting new action.


The SOE Board has evaluated new ways to protect the Ladd's Addition grove from DED.  The Board consulted with other urban foresters and scientists from the US Department of Agriculture to understand the latest best practices in management of urban elm groves. The results of that research indicate that microinjection, the process SOE has used in recent years to protect our elms, is not effective at distributing fungicides to the crown of trees where the elm bark beetle often infects new growth.  Further, the fungicides available for microinjection have not been shown to persist and protect trees for more than two years.  Thus, our three year cycle of microinjection is not providing adequate protection.  Because of the root flare damage (i.e., drilling) done during injections, we cannot inoculate the trees every year.


The preferred alternative to microinjection is a process called macroinfusion, in which Arbortect fungicide is heavily diluted with water and pumped into the root flares of the tree.  This process requires licensed applicators as well as professional pumps and tanks.  The cost per tree using macroinfusion is nearly $600; much more expensive than microinjection.


We do not have the capacity to raise the estimated $50,000 per year needed to protect every tree on a three year cycle using macrofusion.  We can, however, identify areas where DED has taken a foothold.  In those areas, we can selectively inoculate using macroinfusion in an effort to stop the spread to new trees.  To do so, we will begin redirecting funds from microinjection to macroinfusion and monitor the results.


Macroinfusion is not a silver bullet.  But the latest research and field experience indicates it is an effective protection method.  We will use it, microinjection and new scientifically-proven inoculation methods as they become available in an ongoing effort to protect and maintain our beautiful elm trees.


 We'd Like To Hear From You

If you have topic ideas for future SOE newsletters, let us know.  Please send a message to We'll do our best to include proposed topics in upcoming issues.