Can you identify this black and white bug?

I have lived in Oregon all my life and never seen this kind of bug before, what is it? It's not very fast moving, this one wasn't anyway.

Thank you for the excellent image of a native longhorn beetle, the banded alder borer, the technical name Rosalia funebris.

These beetles lay their eggs on the dead branches of certain tree such as alder, maple, oak and willow. In spite of their large size, they do not damage people, pets, or structures.

See The Banded Alder Borer (pdf).

Want to learn more about this topic? Explore more resources from OSU Extension: Urban forestry

A native longhorn beetle, the banded alder borer,the technical name Rosalia funebris. These beetles lay their eggs on the dead branches of certain tree such as alder, maple, oak and willow. In spite of their large size, they do not damage people, pets, or structures.

Photo: Ask Extension

Published Sep 2018, Reviewed 2024

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Jean R. Natter

Master Gardener Diagnostician

OSU Extension Washington County

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