Canadian Forest Service Publications
Détection du Heterobasidion annosum au Québec. 1995. Laflamme, G.; Blais, R. Phytoprotection 76 : 39-43.
Issued by: Laurentian Forestry Centre
Catalog ID: 16696
Availability: PDF (request by e-mail)
Since 1955, the fungus Heterobasidion annosum, the causal agent of annosus root rot, was present in Eastern Canada but only in southern Ontario. In 1968, the presence of the fungus was noted further north, near the Québec border. A group of four already thinned red pine (Pinus resinosa) plantations has been monitored by us since 1983, leading to the detection of H. annosum in the Mayo plantation in 1989. That was the first report of the disease in Québec. In 1993, we found the disease in another plantation of this group, at Saint-Philippe-d'Argenteuil. A third infected plantation was also found near Harrington in 1993, but it was not part of the group monitored. It probably became infected before the others, in 1977. The detection of H. annosum in Québec shows the importance of using préventive measures during the thinning of red pine plantations, and of eradicating the disease in the three infected plantations while it is still possible.