Insects and Spiders - native

Ponderous Borer (Trichocnemis spiculatus) on Aug 24, 2019

Submitter has sample

Description of specimen

Asian long horned beetle
In my back yard

Commentary

Dear Teresa, hard to see but this is either Prionus californicus or the ponderous borer, Trichocnemis spiculatus. The ponderous borer is the largest cerambycid in Oregon. The larvae bore in dead wood of various conifers. They do not infest structures. Adults don’t feed and live for only a short time. Thank you, Helmuth Rogg, Oregon Department of Agriculture

Helmuth Rogg
Aug. 26, 2019, 7:30 a.m.