Mating Elderberry Borers

Blue and Yellow Beetle?
Fri, Jul 3, 2009 at 5:35 AM
Hi, My husband noticed these beetles all over a small tree in our backyard there are all mating and seem content to stay there doing just that… ther are kind of pretty but I am worried that they are not native to Newfoundland Canada.
Newfoundland Canada

Elderberry Borers Mating
Elderberry Borers Mating

Fear not Angela,
The Elderberry Borer, Desmocerus palliatus, is a native insect.  Considering the reported range of this Cerambycid Beetle, from Oklahoma to the east coast, and considering its striking beauty, we do not get as many reports as we would expect.  According to BugGuide, the habitat is “Swampy areas and edges of streams with host plant” and not many people live in swampy areas, so that might explain the dearth of identification requests.  BugGuide also has this information:  “Adults feed on pollen, found on flowers, especially those of elderberry, Sambucus. Life Cycle Larvae feed on elderberry, Sambucus . Eggs are laid on stems, near base of plant. Larvae burrow into stems and then tunnel down to feed on living roots. ”  We are very happy to be able to post your wonderful photo of a mating pair of Elderberry Borers.

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