ALBs leave many clues on or near infested trees, here’s what you can look for:
- Round holes at least three-eighths of an inch in diameter, where adult beetles chewed their way out of the tree
- Pits on the bark that female beetles chew to deposit their eggs
- Accumulation of sawdust-like material (insect waste) around the base of the tree or branches
- Dieback in the tree canopy, or an unseasonable change in leaf color
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