Community Tree Risk Assessment: What's Missing in Your Management Plan?
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Pest Risk and Host Susceptibility Analysis: What's Missing in Your Management Plan?
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Transcript of Community Tree Risk Assessment: What's Missing in Your Management Plan?
Pest Risk and Host Susceptibility Analysis: What's Missing in Your Management Plan?
Every tree around us…
What is the Urban Forest?
475+ known invasive forest pests in USOther invaders
– Norway maple– Buckthorn– Japanese Honeysuckle
Did you know…
Scott Schirmer, IDA
Number of trees157,142,000
Tree and shrub cover 21.0%
Tree cover15.5%
Source: US Forest Service
Regional Forest Summary (Trees)
(based on 2010 i-Tree Eco analysis)
Tree Species Distribution – Chicago Region
European buck-thorn28.2%
Green ash5.5%
Boxelder5.5%
Black cherry4.9%
American elm3.4%
Sugar maple2.8%
White ash2.6%
Amur honeysuckle2.1%
Silver maple2.0%
Northern red oak2.0%
other species41.0%
Top 10 Common Street Trees
2010 Host Risk Analysis
Trees at Risk vs. Compensatory Value
Potential Insect and Disease Risk-Trees
Putting it all together
High Risk Pathways
Urban Canopy Analysis
>
Trees in your community
Management plan should have:
OrdinancesManagement PlanTree Inventory
Questions
• How many trees does your community have?• What condition are they in?• Where are they?
What is a tree inventory?
Tree Inventory is a count of all publicly managed trees
Inventory Options
• All public trees (trees in right-of-ways (streets), on public property, in parks, etc.) • Only street trees
• Public and private trees that impact community spaces
Why do it?
• To know current state of publicly managed community trees Identify where to focus limited resources
• Improve long term management and health to maximize forest benefits
• Identify potential pest and disease risks
• Quantify the economic and environmental benefits of the urban forest resource
Prevention
GIS Mapping Tools
Data Analysis
Is there enough tree diversity to provide resilience to invasive pests and/or diseases?
Tree Inventory
30-20-10 ruleNo more than:30% from one Family20% from one Genus10% from one Species
Asian Longhorned Beetle (ALB) has the potential to cause more damage to trees than Gypsy Moth, Dutch Elm Disease, and Chestnut Blight combined.
Preferred Host• Maple (Acer spp.)• Elm (Ulmus)• Willow (Salix)• Horsechestnut (Aesculus)• Buckeye (Aesculus)
Asian Longhorned Beetle: Annotated Host List Updated by Baode Wang January 2015 (published on USDA APHIS web site) USDA-APHIS-PPQ, Center for Plant Health Science and Technology, Otis Laboratory
What’s at stake?
What a tree inventory can tell you…..
• 250+ plant hosts• Prefers oaks• Immobile females• 140 years to infest NE US• Defoliate 4mil acres/year
USDA APHIS PPQ , USDA APHIS PPQ, Bugwood.org
European Gypsy MothLymantria dispar
How big of a problem would this be in your community?
Update replacement tree lists
A perfect storm!
Keep up-to-date on pest reporting
Resources……
Pest.ceris.purdue.edu
Tree Inventory Apps• i-Tree Toolkit • ArcGIS• Healthy Trees Healthy Cities• Map My Land• Plan-it Geo
