CONTINUING EDUCATION UNIT Tree Risk …

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The art and science oftree risk assessmentcontinues to evolve as we increase our knowl-edge base and with field experience. Treesdo not fail at random. tree failures are pre-dictable over a broad time range. And treeassessment is not an exact science but ascience nonetheless and one that is constantlyadvancing. An arborist performing tree risk assess-ments must be well trained in biology, treestructure, and tree mechanics. The arboristshould possess a high level of comfort andexperience with the inspection process. Ittakes a trained eye to recognize the subtlesigns of impending mechanical failure.

CONTINUING EDUCATION UNIT DECEMBER 2002 www.isa-arbor.com 35 Deadwood Dead trees and dead branches can fail at any time. Dead and decayed wood fail at different rates depending on species, mate-

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