Canadian Forest Service Publications

Heterobasidion irregulare Garbel. & Otrosina, Annosus root rot (Bondarzewiaceae). 2013. Laflamme, G.; Dumas, M.T. Chapter 63, pages 420-423 in Biological Control Programmes in Canada 2001-2012. CABI Publishing.

Year: 2013

Issued by: Laurentian Forestry Centre

Catalog ID: 35286

Language: English

Availability: PDF (request by e-mail)

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Plain Language Summary

Annosus root rot was first described in 1874, in Europe. It appeared in Ontario in 1955 in red pine and was reported for the first time in Quebec in 1989. It is caused by the fungus Heterobasidion irregulare, which establishes itself in pine stands by colonizing freshly cut stumps. It then spreads to other trees through contact between healthy roots and those of an infected stump. Over the years, circles of dead trees emerge, hence the French name of the disease, "maladie du rond". The disease is found in southeastern Ontario, and on the south shore of the St. Lawrence River in the Eastern Townships region of Quebec, and even on the north shore west of Trois-Rivières.

This book chapter is an update on Annosus root rot in Canada, including the most recent research studies. It deals with the speed of progression of the disease toward northern Canada (10 km per year), such that it will reach the boreal forest within the next 5 years. This chapter describes how, in addition to red pine, the disease may also affect white pine and jack pine. It also mentions that the disease could spread from eastern Canada to the Yukon, namely the distribution range of jack pine, and could cause severe tree mortality across Canada. Biological control methods using fungi are also discussed.