Arborists are professionals educated in the art and science of caring for trees, which includes planting, transplanting, pruning, fertilizing, pest management and hazardous tree assessment. They may also be trained in related fields such as urban forestry, horticulture, or landscape architecture. Many are skilled in tree removal and value appraisals. For tips on how to hire a competent arborist, visit www.pnwisa.org, the website of the Pacific Northwest Chapter of the International Society of Arboriculture.

For a list of certified arborists in Alaska, visit www.isa-arbor.com or call the Community Forestry Office.

The next certification exam in Alaska will be in Fairbanks April 19, 2008. Requirements and exam registration information is available at www.isa-arbor.com. Look under Certification.