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Overview of the Emerald Ash Borer ThreatA Proposal to Develop a Strategic Plan for the City of Lethbridgeby Jeff Quinlan
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Getting to Know EAB:First detected in Canada in Windsor, Ontario in 2002
…it is an indiscriminate pest, affecting healthy and stressed trees
..has a nearly 100% tree mortality rate
..has destroyed millions of ash in areas of Ontario and Quebec
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Play Video
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EAB should be a concern for LethbridgeAsh comprise about 30% of our urban forest
Like DED, transportation of firewood = major factor
Spread has been rapid: west to Colorado
Knocking on Manitoba’s door (Minnesota, Ontario)
Lethbridge does not have a strategy in place for EAB
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“Communities where EAB was found earlier were not able to benefit from the lessons of other communities, research initiatives, or the development of new techniques and chemical treatment options. Other factors in the variation of responses includes the capacity of a community to respond both fiscally (dollars) and physically (in-house or contracted manpower and equipment).”
- Retrieved June 23, 2015, from http://www.london.ca/residents/Environment/Trees-Forests/Documents/London_EAB_FINAL_090711.pdf
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Windsor, Ontario EAB “Ground Zero” in 2002
Sustained enormous losses to their urban forest
6000 trees were removed representing 9% of the canopy
$4 million dollar removal and replacement costs
Infestation and spread was rapid once discovered
First Canadian City affected
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Oakville, OntarioEAB detected in 2008
Implemented proactive monitoring and detection programs
Council approved an EAB Work Plan
Treatment program expanded to protect 75% of canopy
“Canopy Club” is a public engagement program
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EAB Infestation in Thunder Bay
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Lethbridge: Our Green Ash TodayGreen ash was densely planted in Lethbridge’s older established communities
These trees make up a significant portion of the City’s tree canopy
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Mountain View Cemetery`
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Nicholas Sheran Park
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The Value of Lethbridge Ash Trees
6.4
32.28
25.25
5.85
Green Ash Annual Benefits as of 2011 ($/tree)
CO2Bioretention (S-tormwater runoff)Energy (cooling ef -fect)Air Quality
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CO2 Sequestration
1977110661326
618534
252829
Annual CO2 Sequestered (kg)
Green AshAmerican ElmPoplarSpruce
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Projected Costs of Tree Work due to EABTree removal rates are difficult to quantify
Conservative estimates are based on unit prices for:Tree removal and average mean replacement valuesRange from $400.00 – $600.00/treeBased on 2014 unit rates
Total costs for nearly 40,000 ash trees = $16 million (lower) - $ 24 million (upper limit)
Does not factor in chemical treatments (i.e. TreeAzin)
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What Is Being Done NowUF Staff assist the CFIA in setting seasonal EAB
traps
Monitor ash trees for signs and symptoms of EAB
Will implement branch sampling as a monitoring technique in the 2015/2016 season
Respond to public concerns re: ash tree health
Educate local tree companies and neighbouring civic employees
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EAB Trap Installation
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Characteristics of Effective EAB Management Plans:Created with the long view in mind
Involve all stakeholder groups (City Council, Employees, Citizens/Private tree owners)
Implement tree inventory programs
Use current research findings, treatment and monitoring tools
Budget allocated for EAB management
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ConclusionEAB is a reality for Ontario, Quebec and several U.S States
Spread of the pest is made easy with human activity
The potential damage to Lethbridge’s urban forest would last generations
A comprehensive management plan is needed before EAB arrives in the prairies
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AcknowledgementsThanks to Lindsay Bell and Dave Walser for
their assistance and continued efforts on behalf of our urban forest
Thanks to John Gilbert, Andrew Sommerville and Chris Witkowski for their help with this project
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Questions/Comments?