Canadian Forest Service Publications

Annosus root rot in pine plantations and the potential risk to jack pine. 2013. Dumas, M.T. Natural Resources Canada. Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario. Frontline Express 75. 2p.

Year: 2013

Issued by: Great Lakes Forestry Centre

Catalog ID: 35167

Language: English

Series: Frontline Express (GLFC - Sault Ste. Marie)

Availability: PDF (download)

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Plain Language Summary

The fungus Heterobasidian irregulare (commonly called annosus) is an aggressive pathogen of red pine in eastern Canada. It causes root and butt decay as well as pockets of mortality in red pine plantations. In the past, freshly cut stumps were treated with borax or urea to discourage spread of the fungus, but due to environmental concerns this practice has been discontinued. A potential biological control agent is the fungus Phlebiopsis gigantea, currently used in Europe and sold as Rotstop. We tested the effectiveness of this fungus and developed improved methods for its formulation and long term storage. We also assessed the potential risk of annosus to infect jack pine stands such as those in the Eastern Townships of Quebec, where the current northern extent of the disease is within 50 km. When we inoculated freshly cut jack pine stumps in southern Ontario with annosus, infection rates were high.