Hi Buddy,
That is a flower longhorn beetle (Family: Cerambycidae, subfamily: Lepturinae). Based on the relatively enlongate pronotum, the subterminal tibial spines seen on the hind leg in your photo, and the color pattern, that is most likely a Stenocorus species.

I don't have very specific information about interactions of Stenocorus species with plants, but here is what the book Western Forest Insects says about flower longhorn beetles in general...

"The subfamily Lepturinae (Hopping 1937, Linsley and Chemsak 1972, Swaine and Hopping 1928) contains numerous species, most of which bore in dead rotting wood, hence are of little economic importance. The adults of many species are colorful and feed on pollen. Typically they are widest through the shoulders, taper to the rear, and have a bell-shaped thorax, often toothed or swollen at the sides. The larvae commonly have numerous padlike structures (ampullae) on the upper surface of the abdominal segments and their legs are more developed than those of other roundheaded wood borers."

Enjoy!