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

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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

More Resources….

Plant Clinicplantclinic@mortonarb.org

Thank you!Tricia Bethke

Illinois Forest Pest Outreach Coordinatortbethke@mortonarb.org