CONTINUING EDUCATION UNIT Tree Risk Assessment Tree …

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. Thepossible result of over-reading these signs isoverreacting. Any existing signs of failuremust be thoroughly evaluated to determinecause. Because every tree is different, perform-ing tree risk assessments is a learning article briefly reviews structural defectsand basic tree process for evaluating the risk oftree failure begins with visual inspection fordefects (visual tree Assessment , VTA), followedby sounding for suspected decay and prob-ing, if necessary, with a portable drill, incre-ment borer, or an advanced decay detectiondevice.

The art and science of tree risk assessment continues to evolve as we increase our knowl-edge base and with field experience. Trees do not fail at random.

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