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Sources for More Information

January/February 2020: Do Your Trees Pose a Risk?

Here are some links that are especially valuable for tree risk assessment.


Three key publications, all available from the online book store of the International Society of Arboriculture.

  • ANSI A300 (Part 9) Tree Risk Assessment a. Tree Failure
  • Tree Risk Assessment, 2nd Edition by E. Thomas Smiley, Nelda Matheny and Sharon Lilly. Part of ISA’s Best Management Practices series.
  • Tree Risk Assessment Manual, 2nd Edition by Julian A. Dunster

Quick Links

  • Publications by the late Dr. Alex Shigo as contained in The Davey Tree Expert Company’s Shigo Collection
  • Training to become Tree Risk Assessment Qualified
  • Forest Service research and development resources pertaining to tree risk assessment
  • Field forms for helping with data collection

More Information

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Last Updated: 03/02/21