Ekspresowa Analiza Zagrożenia Agrofagiem: Coniferiporia weirii (Murrill) L.W. Zhou & Y.C. Dai (2016)

Coniferiporia weirii is a pathogen that causes yellow ring rot of coniferous roots. The main host is green Douglas fir, the most abundant in Pomerania region, but making up a small percentage of the stand. The fungus is a quarantine organism, it is on the EPPO A1 list, its introduction and spread in the EU is prohibited. It naturally spreads slowly. The most likely means of entry is the transport of infected raw material in the form of plant cuttings (not seeds), untreated wood, logs and bark. Detection of the pathogen in the first few years is difficult, especially in large trees, as symptoms are not readily apparent.
C. weirii naturally occurs in the United States, Canada, Japan and China. Due to the similarity between the climatic conditions of the Polish area and the regions where the pathogen occurs, the fungus can also occur in the PRA area and cause economic losses.
Probability of entry: low
Probability of establishment: high
Probability of spread: low, as the most susceptible hosts are introduced trees, some occurring sparsely in the Polish area or in single plantings. The fungus can probably infect many other conifer species found in the EPPO region. The primary phytosanitary measure is to control plant material and wood imported from the area where the pathogen is common. If the occurrence of the species is recorded in Poland, it is necessary to develop and incorporate procedures for dealing with C. weirii.