The native elm bark beetle is a small insect that primarily affects elm trees. It is known for its role in the spread of diseases, particularly the Dutch elm disease, which has devastated elm populations in many areas. These beetles create tunnels under the bark of trees, disrupting the flow of nutrients and water. Adult beetles are typically dark brown to black and measure about 1/8 inch in length. They lay their eggs in the bark, and the larvae feed on the inner layers, causing further damage. Effective management of these beetles often involves monitoring tree health and removing infected trees to prevent the spread of disease.