The Elm Zigzag Sawfly is a new and harmful invasive species in Finland. The insect larvae feed on the leaves of elm trees and eat easily distinguishable and recognizable zigzag patterns on them. Abundant occurrence exposes the tree to other insects and diseases, which can eventually destroy the tree. The spotted sawfly is not a threat to animals or humans.

Read the full article of the Elm Zigzag Sawfly on the University of Oulu website