The European elm bark beetle is a small insect native to Europe and parts of Asia. It primarily feeds on the bark of elm trees, particularly the Ulmus species. This beetle plays a significant role in the ecosystem but can also contribute to the decline of elm populations when present in large numbers. These beetles are known for their role in spreading Dutch elm disease, a fungal infection that has devastated elm trees across Europe and North America. The beetles create tunnels under the bark, which can disrupt the tree's ability to transport water and nutrients, leading to its decline.