I have a very mature American Elm Tree that was infested with scales.. The only way to fight this was to remove infected branches. Due to the size of the tree this could not have been accomplished from the ground... Chad an experienced climber went up in the tree and removed the obvious infected branches.. It should be noted that he is an experienced certified arborist who is also a well known climber who specializes in doing pruning by climbing... The advantage of the climbing is that he is able to get into the centre of the tree not just on the outside....The cost saving was very noticeable as compared to having a bucket truck do the work...He is very conscientious in his climbing using proven safety methods.... He does work in the Calgary and surrounding area... We certainly recommend this consummate professional .. Bill and Bev Hutchinson