Canadian Forest Service Publications

Phytophthora ramorum (sudden oak death) – recent studies in Canada. Abstract. 2011. Shamoun, S.F.; Rioux, D. Pages 57-58 in Proceedings of the Forest Pest Management Forum 2010, November 30-December 2, 2010, Gatineau, QC. Natural Resources Canada, Canadian Forest Service, Ottawa.

Year: 2011

Issued by: Pacific Forestry Centre

Catalog ID: 32910

Language: English / French

Availability: Not available through the CFS (click for more information).

Mark record


Phytophthora ramorum (Pr) is an alien invasive pathogen that causes diseases known as sudden oak death (SOD) (= ramorum bleeding canker), ramorum leaf blight or ramorum shoot dieback. This pathogen can infect more than 120 hosts, several of which being present in Canadian forested and urban areas. SOD attracted attention of the general public around 1995 when thousands of tanoak and oak trees were killed on private and public lands in California. The disease was also reported later in the wild in Oregon as well as in several nurseries throughout the US. In Canada, Pr was introduced a few times in nurseries of British Columbia but the pathogen is not considered established yet. Recent researches at PFC and LFC were mainly carried out in order to develop better mitigation measures or to help assess the risk this pathogen represents to Canada. Our presentation will summarize results about: 1) the development of PCR‐RFLP molecular markers to identify the three Pr lineages; 2) the efficacy of commercial biocontrol products and fungicides against Pr; 3) the assessment of the aggressiveness among isolates and lineages of Pr; 4) the evaluation of susceptibility to Pr of some forest tree species common in eastern Canada; and 5) the research of putative resistance mechanisms in trees to this pathogen.