Utah State University Extension
Bark beetles (Family Curculionidae, Subfamily Scolytinae) are some of the most devastating insect pests in the world. Closely related to weevils, there are almost 500 species of bark beetles in North America alone, each with unique host plants, habits, and life cycles. It is crucial to accurately identify a suspect bark beetle before you consider treatment options.
Davis, Ryan S., "Elm Bark Beetles and Dutch Elm Disease" (2011). All Current Publications. Paper 896.