Tracking the spread of the northern bark beetle (Ips duplicatus [Sahlb.]) in Europe and first records from Switzerland and Liechtenstein


	Lateral view of a male Ips duplicatus showing the characteristic spines 2 and 3 on its declivity (photo: G. Casciano, WSL).

Part of: Wermelinger B, Schneider Mathis D, Knížek M, Forster B (2020) Tracking the spread of the northern bark beetle (Ipsduplicatus [Sahlb.]) in Europe and first records from Switzerland and Liechtenstein. Alpine Entomology 4: 179-184. https://doi.org/10.3897/alpento.4.53808