What kind of beetle is this?

Asked August 15, 2020, 4:49 PM EDT

Found this in our field it's so big! Curious as to what it is.

Clackamas County Oregon

1 Response

The insect is a bit crunched to be certain. But I suspect it is the California root borer, Prionus californica. The larvae (young) are root borers of deciduous trees. See https://wiki.bugwood.org/HPIPM:Prionus_Longhorn_Beetles.

If not a Prionus, the other choice is the Ponderous borer, Ergates spiculatus. Its hosts are fallen trees of Ponderosa pine and Douglas-fir. See https://wiki.bugwood.org/HPIPM:Ponderous_Borer