Yellow Root Rot

Perreniporia subacida

3 host plants

Last updated

Data Maturity Structured

This profile synthesizes data from multiple published sources. Expert field review is in progress.

Western red cedar (Thuja plicata) and other conifers develop white-to-cream conks on roots and root crotches from Perreniporia subacida. Advanced decay creates stringy fibers with small black flecks. The fungus typically affects suppressed or weakened trees. Damage has been minimal; no treatment techniques are established. Favor resistant species when thinning or replanting infected sites.

Damage has not been serious enough for treatment techniques to have been developed. Remove affected trees during harvesting operations.

Quick Reference

Causal Agent
Perreniporia subacida
Host Plants
3
Favorable Conditions
Root contact with infected wood and mycelium. Most active in cool, moist soil...

Management

Vulnerability Window

Root infection year-round but active Oct–May. Disease progression very slow (10–20+ years). Internal decay advances without visible symptoms for years. Visible decline typically summer (heat/drought stress). BBCH 10–89.

What Triggers Infection

Root contact with infected wood and mycelium. Most active in cool, moist soil (50–60°F, Oct–May). Stress conditions and poor drainage favor pathogen spread and disease expression.

Cultural Controls

  • Damage has not been serious enough for treatment techniques to have been developed.
  • Remove affected trees during harvesting operations.
  • Favor tree species not showing damage when thinning or planting sites with yellow root rot.
  • References Hadfield, J.
  • S., Goheen, D.
  • J., Filip, G.

Host Plants (3)