Martin Macauley, ISA Certified Arborist, spotted this Hemlock in Lynnwood, WA while giving an estimate. Martin was chagrined to see that a tree service employee—from another company—had used spurs to climb the tree. Spurs should NEVER be used on a living, healthy tree for pruning.
What are spurs?
Spurs are steel shanks that attach to a climber's boot and calf to allow him to easily ascend a tree. Essentially, he climbs by jabbing the spikes into the tree as he climbs.
What do spurs do to the tree?
Spurs make holes through the bark, the tree's protective layer, into the cambium. The cambium is the living tissue of a tree. The way it works is water and elements flow up through the root system through the cambium, which then distributes the sugars (food) from the leaves throughout the tree. It is essentially a pumping system. When the cambium is compromised, the tree is compromised. Spurs compromise a tree.
How does spurring harm the tree?
The holes left by the spurs allow an avenue for pathogens (disease-producing agents). If the spurs were used previously on a diseased tree, those diseases will be passed into the next living tree. This is equivalent to someone inserting a dirty needle into your body. Chances are, you will get the disease, too. Yikes!
When can spurs be used?
For tree removal only! Any other use of spurs is harmful and negligent.
ISA Certified Arborists are trained to understand the circulatory system of trees and the harmful effects of spurring a tree. Be smart: hire a tree service who has ISA Certified climber on the job (like Blooma Tree Experts). You will be happy you did, and so will your trees.