walnut borer


Definition of walnut borer 

1 : a blue-winged longicorn beetle (Gaurotes cyanipennis) whose larva bores into the wood of the black walnut

2 : any of several ambrosia beetles (especially Anisandrus pyri or A. dispar) that bore under the bark or in the wood of the black walnut

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occurring twice a year or every two years

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