Professional, trained arborists, know how to properly maintain trees for the safety of the public and the health of the tree. Their focus is to reduce the fire hazard caused by trees, branches or other debris coming in contact with energized power lines using safe work practices. Arborists have the knowledge and understanding of trees and shrubs common to their location. This knowledge helps them assess the condition of the trees, provide a diagnosis for potential diseases, and offer their recommendations on how to properly care and maintain the tree.