Black Headed Birch Sawfly vs European Spruce Longhorn Beetle
Side-by-side species comparison
| Attribute | Black Headed Birch Sawfly | European Spruce Longhorn Beetle |
|---|---|---|
| Scientific Name | Craesus alniastri | Tetropium castaneum |
| Order | Hymenoptera | Coleoptera |
| Family | Tenthredinidae | Cerambycidae |
| Size | 7-9 mm | 8–18 mm |
| Habitat | Woodlands | Woodlands |
| Diet | Herbivores | Wood Feeders |
| Regions | Europe | Europe, Northern Asia |
| Conservation | Least Concern | Not Evaluated |
Black Headed Birch Sawfly
A medium-sized sawfly with a dark head and orange body. Larvae are greenish-blue with black heads and feed communally on birch and alder leaves.
Did You Know?
When a predator approaches, the entire colony of larvae simultaneously rears up and thrashes, making the group appear larger and more threatening.
European Spruce Longhorn Beetle
A longhorn beetle native to Europe that bores into spruce trunks. It typically colonizes weakened or recently felled spruce trees.
Did You Know?
It became a regulated quarantine pest after being found attacking healthy spruce in Nova Scotia, Canada.