Elm Leaf Beetle

Natural Habitat

Found primarily on or near elm trees (Ulmus species) in urban, suburban, and forest environments throughout North America and Europe.

Diet & Feeding

Both adults and larvae feed exclusively on the leaves of elm trees. Adults chew small holes in the leaves, while larvae skeletonize the leaf surface by eating everything but the veins.

Behavior Patterns

Adults emerge in spring to lay yellow eggs on the underside of elm leaves. Larvae feed through summer before crawling down the trunk to pupate at the base. They often seek shelter in homes and buildings during the winter months to hibernate.

Risks & Benefits

They are a significant horticultural pest that can cause severe defoliation of elm trees, weakening them and making them more susceptible to Dutch Elm Disease. They are a nuisance in homes during winter but do not bite humans, spread disease to people, or damage house structures.

Identified on: 4/29/2026