Cylindrocopturus furnissi

Photo courtesy of Ken Gray Insect Image Collection, OSU.

Signs & Symptoms

Photo by Chal Landgren, OSU.

  • Larvae bore through the bark to the wood surface. At maturity, they tunnel deeper, into the pith.
  • As needles die, they turn reddish-brown.
  • Dead twigs and branches, due to feeding damage
  • Deformation of branches and poor growth (seen in Douglas-fir seedlings)

Where to Look

Photo by Chal Landgren, OSU.

  • Dry sites with stressed trees
  • Douglas-fir weakened by environmental stress or improper planting

Similar Symptoms As

Photo by Chal Landgren, OSU.

  • Phomopsis canker
  • Bark beetles
  • Drought
  • Winter damage


  • Scout for shoot dieback and feeding galleries on the surface of the wood.
  • Look for 1.0 mm diameter adult weevil exit holes.
  • Check on dead or dying twigs near the top of the tree.

Management Options

  • Target control, if needed, against emerging adults from July to August.
  • Maintain vigorous growth by using proper cultural procedures.
  • Remove and destroy infested trees.
  • Avoid planting on dry sites.

Host Susceptibility

host susceptibility graph

  • High susceptibility: Douglas-fir

Management Calendar

  • Look for dead branches: All year round
  • Look for larvae bore through the bark: Mid-January through April
  • Watch for pupa stage: May through June
  • Find adults: July through August
  • Spray insecticide (if needed), targeting emerging adults: July through August
  • Remove dead branches and trees: September through October