Twig Girdler Beetles: Why Your Hardwoods Drop Green Twigs

If oak, pecan, or hickory trees rain small, leafy twigs in late summer, the twig girdler (Oncideres cingulata) is likely responsible. Females chew a V-groove around pencil-thin branches, lay eggs beyond the cut, and wind drops the twigs. Larvae overwinter inside; adults emerge next fall.

Control is simple sanitation: gather and destroy fallen twigs promptly. This breaks the life cycle without chemicals.