Pruning Elm trees in the Portland metro area is only open between October 15th and April 15th. The reason Elm trees are regulated is due to Dutch Elm Disease. Dutch Elm Disease involves Elm Bark Beetles that burrow into the trees causing the trees to die over time.
Removal or pruning a tree that has Dutch Elm Disease involves extra precautionary measures to ensure the disease does not spread. The dates that Elm pruning and removal are open is in correlation with dormancy. The disease can also spread from an infected tree to a healthy tree by means of their roots. If a healthy tree is within 25-50 feet of an infected tree a root graft should be placed to help eliminate transferring from occurring.
Rich’s Tree Service, Inc. has years of experience handling Dutch Elm Disease. We properly sanitize all our tools that may come in contact with the disease and properly dispose of the wood to eliminate the risk of exposure. All of these steps are important to help eliminate the transfer of the disease.