WSU Extension


Honey locust
Honeylocust canker 
Powdery mildew 
Honeylocust pod gall midge 
Locust borer 

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Caption: Honey Locust borer adult
Photo by: Unknown
Honey locust : Locust borer
(revision date: 4/28/2014)

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

Non-Chemical Management
  • Provide proper culture. Stressed or weakened trees are much more likely to be infested by borers.
  • Avoid injuring plants.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


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Caption: Honey Locust borer adult
Photo by: Unknown