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Northern Research Station
11 Campus Blvd., Suite 200
Newtown Square, PA 19073
(610) 557-4017
(610) 557-4132 TTY/TDD

Asian Longhorned Beetle

Effects on Urban Forests

Research Issue

[photo:] ALB adult on log.  Photo by Kenneth R. Law, USDA APHIS ALB has the potential to devastate tree populations in many cities.  Understanding the potential risk from this and other pests is critical to developing management plans and policies to sustain healthy urban forests.

Our Research

Research focuses on quantifying the composition of the urban forest and potential risk or loss due to ALB in terms of number of trees, leaf area, and structural value. Through our work with many partners, the i-Tree model (www.itreetools.org) was developed to assess urban forest composition, risk from various pests including ALB, and ecosystem services and values derived from the urban forest based on local input data. Data from various cities and national urban tree cover estimates are used to produce national urban forest risks assessments.

Expected Outcomes

Information on the potential risk of ALB to help foster better policies and management to reduce tree loss due to insect pests.

Research Results

Local estimates from various cities (Casper, WY; Minneapolis, MN; New York, NY; Philadelphia, PA; San Francisco, CA; Washington, DC, Wilmington, DE) reveal that the potential risk from ALB varies from 12.1% of the city’s tree population (San Francisco) to 68.1% (Minneapolis), with potential loss in terms of structural value ranging from $81 million (San Francisco) to $2.25 billion (New York). The estimated maximum potential national urban impact of ALB is a loss of 34.9% of total canopy cover, 30.3% tree mortality (1.2 billion trees) and value loss of $669 billion.

Nowak, D.J., R.E. Hoehn, J. Wang, A. Lee, V. Krishnamurthy, and G. Schwetz. 2009. Urban Forest Assessment in Northern Delaware. Resource Bulletin NRS-33 Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 50 p.

Nowak, D.J., R. Hoehn, D.E. Crane, J.C. Stevens and J.T. Walton. 2007. Assessing urban forest effects and values: Philadelphia’s urban forest. USDA Forest Service, Northern Resource Bulletin NRS-7. Newtown Square, PA. 24 p.

Nowak, D.J., R. Hoehn, D.E. Crane, J.C. Stevens and J.T. Walton. 2007. Assessing urban forest effects and values: San Francisco’s urban forest. USDA Forest Service, Northern Resource Bulletin NRS-8. Newtown Square, PA. 24 p.

Nowak, D.J., R. Hoehn, D.E. Crane, J.C. Stevens and J.T. Walton. 2007. Assessing urban forest effects and values: New York City’s urban forest. USDA Forest Service, Northern Resource Bulletin NRS-9. Newtown Square, PA. 24 p.

Nowak, D.J., R. Hoehn, D.E. Crane, J.C. Stevens and J.T. Walton. 2006. Assessing urban forest effects and values: Minneapolis’ urban forest. USDA Forest Service, Northeastern Resource Bulletin, NE-166. 20 p.

Nowak, D.J., R. Hoehn, D.E. Crane, J.C. Stevens and J.T. Walton. 2006. Assessing urban forest effects and values: Washington D.C.’s urban forest. USDA Forest Service, Northern Resource Bulletin NRS-1. Newtown Square, PA. 24 p.

Nowak, D.J., R. Hoehn, D.E. Crane, J.C. Stevens and J.T. Walton. 2006. Assessing urban forest effects and values: Casper, WY’s urban forest. USDA Forest Service, Northern Resource Bulletin NRS-4. Newtown Square, PA. 20 p.

Nowak, D.J., J. Pasek, R. Sequeira, D.E. Crane, and V. Mastro. 2001. Potential effect of Anoplophora glabripennis (Coleoptera: Cerambycidae) on urban trees in the United States. J. Econon. Entomol. 94(1):116-122.

Research Participants

Principal Investigator

Research Partners

  • Daniel Crane, USDA Forest Service, Northern Research Station  
  • Robert Hoehn, USDA Forest Service, Northern Research Station
  • Victor Mastro, USDA APHIS PPQ, Centers for Plant Health Science and Technology
  • Judith Pasek, USDA APHIS PPQ, Centers for Plant Health Science and Technology
  • Ronaldo Sequeira, USDA APHIS PPQ, Centers for Plant Health Science and Technology
  • Jack Stevens, USDA Forest Service, Northern Research Station  
  • Jeffrey Walton, USDA Forest Service, Northern Research Station (now at Paul Smith’s College)

Last Modified: 09/24/2009