Grovesiella abieticola

Photo by Gary Chastagner, Washington State University.

Signs & Symptoms

Photo by Chal Landgren, OSU.

  • Pronounced cankers, often accompanied with overgrowth and thickening
  • Cankers associated with off-color/dead branches on the tree
  • Round, gray-black fruiting bodies (1.6 mm, produced by fungus) within the canker

Where to Look

Photo by Chal Landgren, OSU.

  • On branches between dead and living wood
  • Lower part of tree

Similar Symptoms As

Photo by Gary Chastagner, Washington State University.

  • Phytophthora root rot and stem canker
  • Environmental stress
  • Chemical damage

Scouting

  • Search for slightly sunken dead tissue and cankers on dying branches.
  • Look for overgrowth.

Management Options

  • Cut and destroy trees exhibiting symptoms.
  • Do not replant near infected trees.

Host Susceptibility

host susceptibility graph

  • High susceptibility: Shasta fir, White fir
  • Medium susceptibility: Grand fir, Noble fir

Management Calendar

  • Look for dead branches with overgrowth (most likely during moisture stress): Mid-March through Mid-September
  • Check off-color/dying branches: Mid-April through Mid-September
  • Remove and destroy infected branches: April through Mid-September