An arborist is a specialist in the care of individual trees and are knowledgeable about the needs of trees and are trained and equipped to provide proper care. Hiring an arborist shows you have considered the best management practice for your customer. Tree care decisions should not be taken lightly. Proper tree care is an investment that can lead to substantial returns. Well-cared-for trees are living advertisement o f your quality of work that will add considerable value to your client's property. Poorly maintained trees can be a significant liability. Pruning or removing trees, especially large trees, can be dangerous work. Tree work should be done only by those trained and equipped to work safely in trees.
http://www.treesaregood.com/treecare/hire_arborist.aspx
http://www.treesaregood.com/treecare/hire_arborist.aspx