Birch Sawfly

Natural Habitat

Open woodlands, gardens, and areas where birch trees are prevalent throughout Europe and Asia.

Diet & Feeding

Larvae feed on the leaves of birch trees (Betula spp.), while adults typically feed on nectar and pollen.

Behavior Patterns

Adults are most active during early summer. Females use a saw-like ovipositor to cut slits in leaves and deposit eggs. Larvae often feed gregariously on leaf margins, and the species undergoes a complete metamorphosis (egg, larva, pupa, adult).

Risks & Benefits

They can cause localized defoliation of birch trees, which is a risk to forestry and ornamental plants; however, they do not sting humans. They serve as a food source for birds and parasitic wasps, contributing to ecosystem biodiversity.

Identified on: 6/29/2026