Heritage River Birch Dropping Twigs: Twig Girdler

River birch dropping small branches all winter. Cause?

Twig Girdler / Twig Pruner Beetles

Beetles lay eggs in twig tips, girdle them, twigs fall. Larvae develop in fallen twigs. Population cycles yearly.

Control

• Fall/winter: Rake and burn all fallen twigs.
• Prune and destroy suspected infested twigs still attached.
• No spray needed—sanitation breaks cycle.

Missouri Extension guide with photos