They even provide expert opinion in legal cases. Arborists combine physical skills, technical knowledge, and a sincere interest in trees to gain personal satisfaction and earn a good living. As in other professions, arboriculture has areas of specialization. Commercial arborists prune, cable, fertilize, plant, and remove trees. They treat trees for harmful insects and diseases.
Commercial arborists work for homeowners, power companies, and government agencies.
They help planners and developers to protect trees on construction sites, and serve as expert witnesses in court cases. Municipal arboriculture or urban forestry addresses many of the same tree-care issues as commercial arboriculture. However, city arborists or urban foresters work with trees and woody plants along streets, in parks, and on the grounds of public buildings. They help preserve trees during construction. They develop and enforce tree ordinances and keep detailed records of trees on public property.