Tree Squad can help trees with Cytospora Canker

Cytospora Canker

Colorado blue spruce, Norway spruce, Douglas fir, hemlock and balsam fir

What you will see:

  • Affects low branches and progresses upward
  • Cankers form at the base of small, infected branches
  • Elliptical
  • Diamond-shaped
  • Bluish white pitch covers the cankered area
  • Spores are produced in the cankered area of the bark

Life cycle:

  • Infects old trees and young trees in poor environments
  • Moisture induces spore formation
  • Orange-colored tendrils of spores
  • Spread by splashing rain and wind
  • Infection takes place most frequently during spring and fall
  • Spores infect wounds or other weakened tissues

Cultural practices:

  • Avoid bark and stem injuries
  • Control insects and mites
  • Prune affected branches in fall or early spring
  • Sterilize pruning tools between cuts
  • Enhance vigor
  • Reduce stress in environment by reducing or enhancing watering
  • Increase tree vigor with Tree nutrition


Chemical control options are not available