Ornamental Plum: Peachtree borer
Photo by: K. Grey
Biology
The western peach tree borer is the larvae of a clear-winged moth. Adult moths are blue-black, about 1″ across, have mostly transparent wings, and appear somewhat wasp-like.
They are attracted to bark injuries. The larvae are white to yellowish with brown heads and often mine around the roots, in the trunk at ground level, or higher on the trunk.
Mined trees often have gumming (sap leakage) and large amounts of a sawdust-like material present at the entrance holes.
Mining can weaken and kill large branches and entire trees by girdling them.
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!
- Avoid injuries to trees, particularly to the trunk and crown areas.
- Prune during late winter to early spring, so wounds can heal before adult female moths are laying eggs.
- Carefully remove individual larvae with the tip of a pocketknife. Try to avoid further damage to the tree.
- Maintain vigorous, healthy trees.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Esfenvalerate is toxic to bees. Do not apply products containing esfenvalerate on or near blooming plants.
- To minimize risk to bees, apply in the evening after bees have stopped foraging for the day.
- Apply generally in late spring or when adults are active.
- Adult flight is usually from late June through September. Apply product to trunk at base above soil line.
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.