Red Oak Twig Drop: Twig Girdler and Pruner Beetles

Diagnosis

Clean-cut twig tips with leaves dropping in wind = twig girdler or twig pruner (Cerambycidae beetles). Both attack oaks. One tree affected, one not = localized infestation.

Beetle Differences

• Twig Girdler: Chews V-groove from outside in, ragged center, smooth bark cut
• Twig Pruner: Cuts from inside out, smooth interior cut, ragged bark edges

Control (Same for Both)

1. Fall/winter: Collect ALL fallen twigs
2. Prune suspected infested twigs still attached
3. Destroy by burning, shredding, or removal
4. Repeat 2-3 years to eliminate population

Tree Health Impact

Minimal unless severe, multi-year. Young trees can become deformed. Fertilize for vigor: 10-10-10 at 1 lb per inch trunk diameter.

Reference

Auburn University Twig Girdler Bulletin