The elm bark beetle is a small insect that primarily targets elm trees. These beetles are known for their role in spreading the Dutch elm disease, a fungal infection that can be deadly to these trees. The adult beetles create tunnels under the bark, disrupting the tree's ability to transport water and nutrients. Elm bark beetles are typically brown or black and measure about 1/8 inch long. They lay their eggs in the bark, and when the larvae hatch, they continue to feed on the tree. Effective management of these beetles often involves monitoring tree health and removing infected trees to prevent further spread.