TreeAzin is a tree injection system that is used to protect trees from the Emerald Ash Borer, an invasive species of beetle that is responsible for killing millions of ash trees in North America. TreeAzin is an insecticide that is injected directly into the tree's trunk, where it is then distributed throughout the tree's vascular system. The insecticide is toxic to the Emerald Ash Borer, but not to the tree itself. TreeAzin is considered an effective and environmentally friendly way to protect trees from the Emerald Ash Borer.