Green Immigrant Leaf Weevil vs Black Headed Birch Sawfly
Side-by-side species comparison
| Attribute | Green Immigrant Leaf Weevil | Black Headed Birch Sawfly |
|---|---|---|
| Scientific Name | Polydrusus formosus | Craesus alniastri |
| Order | Coleoptera | Hymenoptera |
| Family | Chrysomelidae | Tenthredinidae |
| Size | 5-7 mm | 7-9 mm |
| Habitat | Orchards | Woodlands |
| Diet | Herbivores | Herbivores |
| Regions | Europe, introduced to Northeastern North America | Europe |
| Conservation | Least Concern | Least Concern |
Green Immigrant Leaf Weevil
A small, brilliant metallic green beetle covered in tiny iridescent scales that produce its striking coloration. It is native to Europe but has become established in parts of North America.
Did You Know?
Its brilliant green color comes from microscopic scales on its body; once these scales wear off, the beetle appears dull brown or black underneath.
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.