Elms are trees that are commonly victims of bark beetle infestations. Bark beetles are small insects that feed on the inner bark of trees, causing damage to the tree's vascular system and leading to its death. Elms are particularly vulnerable to bark beetle infestations due to their thin bark and shallow root systems. As a result, elms are often the first trees to suffer from bark beetle infestations, making them the most common victims of bark beetle activity.