Upper stem canker

Diaporthe phaseolorum

4 host plants · Fungal

Last updated

Data Maturity Baseline

This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.

Upper stem cankers are caused by fungi in the soil. Seedling Douglas fir trees are affected, with the tops of infected trees turning yellow.

Start with sanitation: remove and dispose of affected material as you find it. Thin dense growth to improve air circulation, and redirect irrigation away from foliage. If the condition persists despite cultural adjustments, your local Extension office can help identify the pathogen and recommend targeted treatments.

Quick Reference

Agent Type
fungal
Causal Agent
Diaporthe phaseolorum
Host Plants
4

Management

Cultural Controls

  • Prune out and destroy infected branches.
  • Plant disease-free nursery stock.
  • Carefully inspect plants arriving from New Jersey or from the Southern States where this disease is a problem.

Host Plants (4)

Pseudotsuga macrocarpa Bigcone Douglas-fir Pseudotsuga menziesii Douglas-fir Pseudotsuga menziesii var. glauca Rocky Mountain Douglas-fir Blue Douglas-fir Inland Douglas-fir Colorado Douglas-fir Pseudotsuga wilsoniana Taiwan Douglas-fir