Honey locust: Honeylocust pod gall midge
Photo by: R.S. Byther
Biology
The honey locust pod gall midge is a tiny orange gnat that lays its eggs on new foliage in the spring.
The small pinkish or yellow-white maggots feed on the leaves, which become deformed, thickened, and pod-like in appearance. The larval are sheltered inside the deformed leaves.
Infested leaves may dry and drop from the tree. Small shoots may be killed.
This is mainly an aesthetic concern, since the ornamental quality of the tree may be lost.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- Pick and destroy infested leaves, when practical, to help improve appearance.
- Prune out dead twigs and branches.
- Black locust (Robinia pseudoacacia) is not attacked. The honey locust (Gleditsia triacanthos) variety ‘Shademaster’ is reported to be less susceptible, but ‘Sunburst’ is very susceptible.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- The key to successful management is protection of new foliage with a registered insecticide.
- Sometimes repeat applications are needed, at 2-4 weeks, beginning late spring.
- Homeowners should not make foliar applications to trees over 10 ft tall.
- Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.