Honey locust: Locust borer

categories: Honey Locust Honey Locust Insects Ornamental trees Ornamentals

revision date: 2022-11-23 12:51

Black and yellow adult Honey Locust borer.
Honey Locust borer adult
Photo by: Unknown


Black locust (Robinia pseudoacacia) may be infested by the larvae of a boring beetle. Eggs laid in the fall on the bark hatch into larvae which burrow beneath the bark and feed. Symptoms of feeding include swollen, discolored, or oozing patches of bark. Openings in the bark are also present, and piles of debris drop to the ground beneath the openings. The adult is a longhorned beetle about 1/2″-3/4″ in length. It is black with yellow markings.

Management Options

Use Integrated Pest Management (IPM) for successful plant problem management.

Non-chemical Management

Select non-chemical management options as your first choice!

  • Provide proper culture. Stressed or weakened trees are much more likely to be infested by borers.
  • Avoid injuring plants.

Chemical Management

IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.

  • None recommended