Alder Leaf Beetle

Damp environments, such as riverbanks, wetlands, and woodlands where alder and hazel trees are present.

Herbivorous; both adults and larvae feed on the leaves of alder, hazel, birch, and beech trees.

Adults hibernate in leaf litter or under bark and emerge in spring. They skeletonize leaves while feeding and can produce several generations per year in warmer climates.

Generally considered a pest for alder and hazel trees as they can cause significant defoliation, though they rarely kill established trees. They have no direct risk to humans.