Canadian Forest Service Publications

Natural infection of Pinus contorta var. latifolia, Pinus banksiana and their hybrid by Dothistroma septosporum in Alberta, Canada. 2021. Ramsfield, T.; Myrholm, C.; Tomm, B. Forest Pathology 51(5):e12717.

Year: 2021

Issued by: Northern Forestry Centre

Catalog ID: 40671

Language: English

Availability: PDF (request by e-mail)

Available from the Journal's Web site.
DOI: 10.1111/efp.12717

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Mark record


Seedlings of lodgepole pine (Pinus contorta var. latifolia), jack pine (P. banksiana), and their hybrid were infected by Dothistroma septosporum under natural conditions in Alberta, Canada, after planting these taxa within a heavily infected stand of lodgepole pine. This experiment has further proven that all three of these taxa are hosts for the pathogen. This information is necessary for assessing the risk of eastward movement of the pathogen from Alberta through populations of P. banksiana in the boreal forest.

Plain Language Summary

Dothistroma septosporum is the causal agent of Dothistroma needle blight, an important disease of pines around the world. In 2012, Dothistroma needle blight was found on lodgepole pine at the Alberta Tree Improvement and Seed Centre (ATISC) near Smoky Lake, Alberta. ATISC is located within the natural range of jack pine; however, records of Dothistroma needle blight on jack pine from the Canadian Forest Service Forest Insect and Disease Survey and the Canadian Plant Disease Survey are very rare. This experiment was conducted to contribute information necessary for a risk assessment of the eastward movement of the disease through jack pine in the boreal forest. This work proved that jack pine, as well as the lodgepole pine x jack pine hybrid, are also susceptible to the disease. Monitoring of the eastward spread of this disease through jack pine in the boreal forest should be conducted.