Black-locust-pest
Guides
Megacyllene robiniae
Locust Borer
Megacyllene robiniae, the locust borer, is a longhorn beetle endemic to eastern North America and a significant pest of black locust trees (Robinia pseudoacacia). Adults are active from late August through October, feeding on goldenrod pollen. The species exhibits striking black and yellow banding that mimics wasps. Larval tunneling in living black locust wood creates entry points for fungal pathogens, contributing to tree decline and wind damage susceptibility.