Douglas-fir Beetle vs Japanese Rhinoceros Beetle (Blue)
Side-by-side species comparison
| Attribute | Douglas-fir Beetle | Japanese Rhinoceros Beetle (Blue) |
|---|---|---|
| Scientific Name | Dendroctonus pseudotsugae | Trypoxylus dichotomus septentrionalis |
| Order | Coleoptera | Coleoptera |
| Family | Curculionidae | Dynastidae |
| Size | 4-6 mm | 35-70 mm |
| Habitat | Mountains | Grasslands |
| Diet | Wood Feeders | Sap Feeders |
| Regions | Western North America from British Columbia to Mexico | East Asia, Japan (Hokkaido) |
| Conservation | Least Concern | Least Concern |
Douglas-fir Beetle
A dark reddish-brown bark beetle that attacks Douglas-fir trees, particularly those weakened by drought or windthrow. It is among the most damaging bark beetles in the Pacific Northwest.
Did You Know?
It preferentially attacks fallen or stressed trees, but during outbreaks it can kill large numbers of healthy standing trees.
Japanese Rhinoceros Beetle (Blue)
The northern Japanese subspecies of the rhinoceros beetle, found in Hokkaido. Slightly smaller and darker than mainland populations, adapted to cooler climates with a shorter active season.
Did You Know?
Hokkaido rhinoceros beetles emerge later in summer than their southern relatives and have a compressed breeding season due to the shorter northern summer.