EPPO Platform
on PRAs

Summary of the Express Pest Risk Analysis for Coniferiporia weirii


Coniferiporia weirii occurs in patches or centres of infection mostly as root rot. Pathogen may infect many conifer species in Europe. The main host plant is Pseudotsuga menziesii. Coast Douglas-fir occurs only in Pomerania and constitutes a relatively low proportion of mixed stands. C. weirii has A1 quarantine status for EPPOs. Fungus introduction and spread is prohibited in Europe. The most likely way of entry is import of infested seedlings, infected raw timber, logs, bark. Natural dispersal occurs slowly. The disease is hard to detect, because symptoms become apparent when the root system is in an advanced stage of deterioration. C. weirii is native North America, Japan and China species. The fungus may appear in PRA area, in case of similar climatic conditions.

Rating of the likelihood of entry: Low

Rating of the likelihood of establishment outdoors and in protected conditions: High

Rating of the likelihood of spread: Low (The main host plants are introduced and rarely grow in Poland. However C. weirii may infect many conifer species in EPPO region)

The most important phytosanitary measure is monitoring of imported plant material and wood from area where fungus occurs.

It is necessary to prepare strategies and eradication measures in case of fungus occurance in PRA area.


  • Coniferiporia weirii


  • Abies amabilis
  • Abies grandis
  • Abies lasiocarpa
  • Abies magnifica
  • Abies mariesii
  • Abies sachalinensis
  • Chamaecyparis sp.
  • Cupressaceae
  • Larix occidentalis
  • Picea jezoensis
  • Picea sitchensis
  • Pinus contorta
  • Pinus monticola
  • Pinus ponderosa
  • Pseudotsuga menziesii
  • Tsuga diversifolia
  • Tsuga heterophylla
  • Tsuga mertensiana


Type File Size
Pest Risk Analysis Download 318,58kB

PRA Area

  • Poland