willow borer

noun

Definition of willow borer 

1 : any of several small bronzy longicorn beetles of the genus Agrilus that bore in the sapwood of the willow tree and often kill it: such as

a : a beetle (A. politus)

b : a beetle (A. anxius) that infests also poplars and birches

3 : a European weevil (Cryptorhynchus lapathi) introduced and destructive to willows in the eastern U.S.

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