Unheavenly Ambrosia Beetles
I've received a number of reports recently from landscape managers and arborists of thin cylindrical strands of white sawdust appearing to ooze out of small holes in the trunks of recently planted trees. These delicate, odd looking structures are sometimes called "frass toothpicks" and are the calling card of Ambrosia Beetles. They also indicate trees are in serious, irreversible trouble.
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