Canadian Forest Service Publications

Emerging Phytophthora diseases: Is there a threat to Canadian forests?/Est-ce que les maladies émergentes causées par les Phytophthora spp. sont une menace pour les forêts canadiennes? 2012. Shamoun, S.F.; Rioux, D. Pages 148-149 in Proceedings of the Forest Pest Management Forum 2011/Compte rendu du Forum sur la répression des ravageurs forestiers 2011, December 6-8, 2011, Ottawa Convention Centre, Ottawa, ON. Natural Resources Canada, Canadian Forest Service, Ottawa, Ontario.

Year: 2012

Issued by: Pacific Forestry Centre

Catalog ID: 34159

Language: English / French

Availability: PDF (download)

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Forests and landscape areas throughout the world are under serious threat from an increasing number of Phytophthora species. Diseases such as jarrah (Eucalyptus marginata) dieback (P. cinnamomi) in western Australia, needle blight (P. pinifolia) of Pinus radiata planted in Chile, root rot (P. lateralis) of Chamaecyparis lawsoniana in western North America and chestnut ink disease (P. cambivora & P. cinnamomi) in Europe cause severe tree damage. In addition, European alders have recently been affected by a lethal root and collar rot (P. alni). Diseases caused by P. ramorum and P. kernoviae have also drawn the attention of several regulating agencies worldwide. For instance, in 2009, P. ramorum, which usually affects broadleaf species, was found on Larix kaempferi in the United Kingdom, and so far 2 million trees have been killed or felled in an attempt to control the disease. In Canada, the threat from several Phytophthora spp. is real and there are significant gaps in our understanding of these pathogens. We will soon have to address questions such as: What are the environmental conditions promoting the virulence of Phytophthora spp.? How can these diseases be rapidly and accurately diagnosed? What can be done to improve risk assessments and control measures of these pathogens?