Black-Stem-Borer-1

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A black stem borer entry hole (left), a compressed sawdust toothpick emerging from an entry hole (right), and an adult black stem borer (inset). Photos courtesy of Deborah Breth (Cornell Cooperative Extension), Chris and Juli McGuire (Two Onion Farm), and Maja Jurc (University of Ljubljana), respectively.

A black stem borer entry hole (left), a compressed sawdust toothpick emerging from an entry hole (right), and an adult black stem borer (inset). Photos courtesy of Deborah Breth (Cornell Cooperative Extension), Chris and Juli McGuire (Two Onion Farm), and Maja Jurc (University of Ljubljana), respectively.