Emerald Ash Borer - MN Chapter · % Tree Mortality EAB Population Size Graph derived from EAB...
Transcript of Emerald Ash Borer - MN Chapter · % Tree Mortality EAB Population Size Graph derived from EAB...
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Emerald Ash Borer
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The Growing Impact
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How Does EAB Kill Trees?
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0 2 4 6 8 10 12
Years Since Introduction
% Tree Mortality
EAB Population Size
Graph derived from EAB spread data from: Siegert, et al and Ash mortality data from Knight, et al
This is a hypothetical example of how EAB population size and tree mortality change over time.
How Does EAB Kill Trees?
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11.18.2014
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Traps
• 2014 ~1200
• 2013 ~900
• 2012 ~6500
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Results - Initial St Paul Infestation
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Results - Initial Infestation
EAB abundance in core
0%
50%
100%
0
250000
2009 2010 2011 2012
Est
ima
ted
EA
B
% Phloem Area Removed
Predicted EAB Abundance
Measured EAB Abundance
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Saint Paul, MN (Total EAB Impact)
�Low estimate $113 Million
�High estimate $227 Million
Estimated costs of EAB (Sydnor 2011 et al.) per capita approach
(285,068)
Potential total costs per 1,000 residents estimated to be
between $395,943 and $769,687
mo
Whether You Like it or Not, EAB Will Cost You Money
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Monitoring Spread
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Monitoring Spread
Comparing Proportion of Infested Trees
Years
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Pro
porti
on o
f tre
es w
ith E
AB
(±
SE
)
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Zone 1
Zone 2
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EAB Detection Efficacy
Comparing Detection Methods
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Predicting Mortality is
Tricky
• Larval freeze
temperature varies
• Temperatures within
trees varies
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(Map by R .C. Venette)
January 2014
Intl Falls -39F
Superior -23F
Twin Cities -23°F
La Crosse -20F
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rva
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qu
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Ash mortality
No winter mortality60% yearly
winter
mortality
90% yearly winter
mortality
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Prevention – Firewood Education
Prevention Efforts
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� Wasp releases
� Larval parasitoid
� Egg parasitoid
� Larval parasitoid recovery
in SE MN
� Attacking EAB
� Reproducing
� Dispersing (found a half
mile from nearest
release)
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James Smith
Monitoring for Emerald Ash Borer
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MI Dept. Agr. Edward Czerinski
Monitoring for Emerald Ash Borer
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Steve Katovich
Art Wagner
Monitoring for Emerald Ash Borer
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Early Detection
Monitoring for Emerald Ash Borer
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Management
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� Education� Of public officials, decision makers, private citizens
� Inventory/Assessment� Define the scope of problem
� Establish an economic conversation
� Management Plan/Decision Making
� Treatments� To save trees
� To stage removals for later budget cycles
� Removals
� Replacement
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� The pattern of tree losses caused by EAB is the key
driver of your management options
� Where are you at on the curve?
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Ash Mortality from EAB
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Ash Mortality from EAB
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� Discovered in 2002
� Virtually all ash in Detroit are gone except for those that
have been treated
� Treatments were essentially experimental
� Management Options that Remain:
� Replanting
� Species diversification
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Graph from Tinkel, 11/292012 - Memo to City Managers – EAB University Seminar.
EAB in Fort Wayne, Indiana
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Ash Mortality from EAB
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� Discovered in 2006
� Performed an inventory and tree assessment
� At the onset of EAB Fort Wayne had about 16,000
municipal ash trees
� These trees provided an annual green benefit of
approximately $1.2 million (i-Tree)
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� By 2011 there were 11,500 ash left� About 3,700 removals in 2011
� About 5,000 slated for removal in 2012
� 10,000 trees treated for 1 year –lost funding� Good sense of “what” to do
� Little support to get traction
� Treating approximately 1,000 trees annually
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� Replacement with an eye for diversity� Risk prevention threatens replacement
budgets
� The risk of lawsuits from falling limbs is real
� Removal� Several thousand standing dead trees
� Several thousand more next year
� Treatment� Continue preservation on about 1000
important trees
� Public awareness/education
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Ash Mortality from EAB
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� Ask yourself a series of questions:
� How many ash do I have?
� When EAB is “all over with”, what do you want to be left
with?
� Do I have community canopy initiatives?
� What does the public want?
� What is the motivation of the Council? Mayor? CFO?
� Your goals drive your decision making
� Your place on the curve drives decision making
� The further along the curve, the fewer choices
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� EAB and the wood waste it will create will be of historical
significance
� It will require significant time, energy, and $$$
� What will you do with your wood waste?
� Planning is key right now.
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Content of slides used with permission from:
James Zwack, The Davey Institute, Dr. Rich Hauer,
University of Wisconsin-Steven’s Point, Mark
Abrahamson, Minnesota Department of Agriculture
Gail Nozal
S&S Tree and Horticultural Specialists a DAVEY Company.
[email protected], 651-451-8907