Many times trees will develop large wounds in the trunk or on a large limb due to old pruning cuts or lack of vigor to close the wound. Some trees are able to withstand decay better than others, yet careful evaluation is very important. As the tree develops decay it weakens either the trunk or limb and it is important to evaluate whether the tree is a hazard or not. There are several methods to acquire sufficient information in order to determine whether the tree must beremoved. Some methods can be as simple as the sound of the trunk too using resistograph technology to determine the extent of decay. Upon identifying the tree species and size the most appropriate method will be used to provide the most accurate results. The correct evaluation is very important because as the trees weaken they are prone to fail.