Pecky Rot

Postia amara

2 host plants · Fungal

Last updated

You'll see pecky rot in cedar and other conifers as yellowish-brown discoloration in heartwood, creating a characteristic pecked appearance. Trees with conks or shot-hole cups should be felled and removed when possible. This decay-causing fungus persists in wood for years. Prevention through proper drainage and maintaining tree health is essential. Monitor trees for signs of infection. Rot diseases are difficult to manage once established. Focus on prevention through proper culture and site selection.

Trees with conks or shot-hole cups should be felled and/or removed. In forestry, lower rotation age for incense-cedar.

Quick Reference

Agent Type
fungal
Causal Agent
Postia amara
Host Plants
2
Favorable Conditions
High moisture, especially in ravines; preexisting wounds and fire scars incre...

Management

Vulnerability Window

Year-round in wet conditions; visible damage accumulates over time.

What Triggers Infection

High moisture, especially in ravines; preexisting wounds and fire scars increase risk

Cultural Controls

  • Trees with conks or shot-hole cups should be felled and/or removed.
  • In forestry, lower rotation age for incense-cedar.
  • Reference Goheen, E.M., and Willhite, E.A. 2006.
  • Field guide to the common diseases and insect pests of Oregon and Washington conifers.
  • R6-NR-FID-PR-01-06.
  • Portland, OR.

Host Plants (2)

Sources & References

Primary: PNW Plant Disease Management Handbook

Data Maturity
Baseline Extension data. Expert review underway.