The larvae are white, legless and C-shaped. Identifying the Injury. Damage is conspicuous in log ends. Streaks of stain originating from the tunnels are called flagworm defects. Eggs are laid in chambers along the main tunnel where the larvae live and develop.
Larval food is a white fungus that grows on the gallery walls.
There are two to three generations per year. No natural enemies have been found. Protection of veneer-quality trees with insecticides should be considered.