Canadian Forest Service Publications

Pinus banksiana, a new primary host of the pathogen Heterobasidion irregulare in eastern Canada. 2013. Dumas, M.T.; Laflamme, G. Pages 184-186 in Canadian Plant Disease Survey 2013, Disease Highlights. CPDS Vol. 93, May 2013. Canadian Phytopathological Society.

Year: 2013

Issued by: Laurentian Forestry Centre

Catalog ID: 35172

Language: English

Availability: PDF (request by e-mail)

Mark record


The pathogen Heterobasidion irregulare has been killing mainly Pinus resinosa in eastern Canada. Other pine species could be affected by the disease. Our trials show that Pinus banksiana, the most widely distributed pine in Canada, is a primary host for H. irregulare.

Plain Language Summary

Found in Ontario and Quebec, annosus root rot is an invasive disease that takes hold in a stand by colonizing the stumps of recently cut red pine trees. It spreads through root grafts with the roots of infected stumps. The disease can attack other species, such as white pine and balsam fir, whose roots come into contact with infected trees.

Scientists knew that the stumps of red pine trees were entry points for annosus root rot, but in this study, they have proven that the stumps of jack pine trees are also hosts for this disease. Because the properties of pathogenic fungi are not altered by the substrate that they colonize, this means that annosus root rot can cause mortality in jack pine.