Canadian Forest Service Publications
Global threat from Phytophthora forest diseases with a Canadian perspective on sudden oak death disease caused by Phytophthora ramorum. 2012. S. F. SHAMOUN AND D. RIOUX. British Columbia Regional Meeting, 2012/Reunion regionale de la Colombie-Britannique, 2012, Canadian Journal of Plant Pathology, 35:1, 87-95.
Issued by: Pacific Forestry Centre
Catalog ID: 35814
Available from the Journal's Web site. †
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Phytophthora is a genus of more than 100 described species, and is probably the most destructive group of plant pathogens throughout forests and landscape areas worldwide. Diseases such asjarrah dieback [P. cinnamomi Rands] in western Australia, needle blight [P. pinifolia Duran, Gryzenh. & Wingf.] of radiata pine planted in Chile, root rot [P. lateralis Tucker & Milbrath] of Port Orford cedar in western North America, chestnut ink disease [P. cambivora (Petri) Buisman and P. cinnamomi] and root and collar rot of alder [P. alni Braisier & Kirk] in Europe cause severe damage. Diseases caused by P. ramorum (Pr) Werres et al. and P. kernoviae Braisier et al. have also drawn the attention of several regulating international agencies. For instance, in 2009, Pr, which usually affects broad leaf species, was found on Japanese larch in the U.K. and so far 3 million trees have been killed or felled in an attempt to control the disease. In Canada, Pr was introduced a few times in nurseries of British Columbia but the pathogen is not considered established yet. At the Canadian Forest Service, research is being carried out in Abstracts - British Columbia Regional Meeting, 2012 order to understand the biology, molecular differentiation among clonal lineages, and development of mitigation measures to help assess the tisk this pathogen represents to Canada. Our presentation summarized the results about: I) PCR-RFLP molecular markers to identify the three Pr lineages; 2) efficacy of biocontrol products and fungicides; 3) assessment of the aggressiveness among isolates and lineages; 4) evaluation of susceptibility of some forest tree species common in eastern Canada; and 5) research of putative resistance mechanisms in trees to this pathogen.