Bark Beetles

Bark Beetles and Ambrosia Beetles: the Big Picture

I've received several reports over the past few weeks from landscape managers and arborists of small holes in tree trunks that are oozing sap or exuding cylindrical strands of white sawdust. These delicate, odd-looking structures are the calling card of ambrosia beetles and are sometimes called "frass toothpicks." The oozing holes are the work of bark beetles.
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Joe Boggs