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Sources for More Information

Bulletin #15: Tree Risk Assessment — Recognizing & Preventing Hazard Trees

Some excellent publications are available that expand on the material presented in Bulletin No. 15. In addition to the following book, numerous publications and other aids are available from the International Society of Arboriculture.

  • A Photographic Guide to the Evaluation of Hazard Trees in Urban Areas
    by Nelda P. Matheny and James R. Clark

    This is a very thorough treatment of a very important topic. This 72-page book is well illustrated and presented in a style that is easy to understand. Evaluation methods and forms are included, and a description of structural failure histories for over 100 species and cultivars. Available from

    P.O. Box 3129
    Champaign, IL 61826-3129

Shigo Publications

Probably no other single individual has done as much research and public education about understanding tree decay and hazards as the late Dr. Alex Shigo, former chief scientist and project leader with the U.S. Forest Service. His various publications and other materials are now available online. Of particular interest here is his leaflet, Tree Hazards–13 Questions That Could Save a Life. For more information visit Shigo Publications online.

Shigo Publications
PO Box 2466
Snohomish, WA 98291-2466
Phone: 360-862-1869
Fax: 360-862-8490

Tree Risk Assessment Courses

Arborists and urban foresters now have the opportunity to expand their knowledge and training in the fundamentals of tree risk assessment by attending qualification courses offered in a number of locations. More information is available from the International Society of Arboriculture.