Subject: Looks like a box elder bug but different
Location: North Dakota
January 19, 2013 9:47 pm
This is in our house in North Dakota what is it?
Signature: Kelsey

Cedar Tree Borer

Dear Kelsey,
This is most definitely not a Boxelder Bug, but rather a Longhorned Borer Beetle in the family Cerambycidae.  We scoured the pages of Bugguide to try to match your beetle, which has very distinctive markings, and we finally located the Cedar Tree Borer,
Semanotus ligneus, on BugGuide with the note:  “Found adult in fire wood, 3/4 in. long.”  Joe MacGown has a beautiful illustration posted to DeviantART.  According to Forestry Images, it “can be on bed frames.”  We suspect your individual was either brought into the house with firewood or it emerged from some furniture.  Wood boring insects that are in the larval stage when wood is milled sometimes emerge many years after furniture has been built or homes have been built.  According to BugGuide, it feeds on “Juniper, Cedar.”  Are you burning either of those two woods?

Location: North Dakota

One Response to Cedar Tree Borer

  1. Joan Hotson says:

    We have a twenty-foot cedar hedge infested with something that produces tiny shotholes and blisters. Could be two pests. On scratching a blister, a tiny insect emerged, clear winged with a distinctive green V on its head. Any club?

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