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Community Tree Risk Assessment: What's Missing in Your Management Plan?

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Community Tree Risk Assessment: What's Missing in Your Management Plan?

  1. 1. Pest Risk and Host Susceptibility Analysis: What's Missing in Your Management Plan?
  2. 2. Every tree around us… What is the Urban Forest?
  3. 3. • 475+ known invasive forest pests in US • Other invaders – Norway maple – Buckthorn – Japanese Honeysuckle Did you know… Scott Schirmer, IDA
  4. 4.  Number of trees 157,142,000  Tree and shrub cover 21.0%  Tree cover 15.5% Source: US Forest Service Regional Forest Summary (Trees) (based on 2010 i-Tree Eco analysis)
  5. 5. Tree Species Distribution – Chicago Region European buckthorn 28.2% Green ash 5.5% Boxelder 5.5% Black cherry 4.9% American elm 3.4% Sugar maple 2.8% White ash 2.6% Amur honeysuckle 2.1% Silver maple 2.0% Northern red oak 2.0% other species 41.0%
  6. 6. Top 10 Common Street Trees
  7. 7. 2010 Host Risk Analysis
  8. 8. Trees at Risk vs. Compensatory Value
  9. 9. Potential Insect and Disease Risk-Trees
  10. 10. Putting it all together
  11. 11. High Risk Pathways
  12. 12. Urban Canopy Analysis >
  13. 13. Trees in your community Management plan should have: Ordinances Management Plan Tree Inventory
  14. 14. Questions • How many trees does your community have? • What condition are they in? • Where are they?
  15. 15. 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
  16. 16. 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
  17. 17. Prevention
  18. 18. GIS Mapping Tools
  19. 19. Data Analysis Is there enough tree diversity to provide resilience to invasive pests and/or diseases? Tree Inventory 30-20-10 rule No more than: 30% from one Family 20% from one Genus 10% from one Species
  20. 20. 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?
  21. 21. What a tree inventory can tell you…..
  22. 22. • 250+ plant hosts • Prefers oaks • Immobile females • 140 years to infest NE US • Defoliate 4mil acres/year USDA APHIS PPQ , USDA APHIS PPQ, European Gypsy Moth Lymantria dispar
  23. 23. How big of a problem would this be in your community?
  24. 24. Update replacement tree lists
  25. 25. A perfect storm!
  26. 26. Keep up-to-date on pest reporting
  27. 27. Resources…… Tree Inventory Apps • i-Tree Toolkit • ArcGIS • Healthy Trees Healthy Cities • Map My Land • Plan-it Geo
  28. 28. More Resources…. Plant Clinic
  29. 29. Thank you! Tricia Bethke Illinois Forest Pest Outreach Coordinator