Tree injecting requires a different approach to pest control. The process involves injecting the soil around a tree with a systemic insecticide. After the soil is injected the insecticide is picked up by the roots and is translocated throughout the tree by its vascular system making the sap toxic to sucking and chewing insects.
Tree injections are very effective against the larvae of boring insects. In North Central Washington injecting birch trees for the bronze birch borer is by far the most effective control method. Once birch trees are infected it is fatal to them unless they are treated in time. The downside to tree injection is the need to inject in the fall because of the time it takes them to translocate the insecticide throughout the tree. On the upside the whole tree is protected from top to bottom for the season reducing the need to power spray and therefore eliminating the chance of drift.