Canadian Forest Service Publications

The potential for biological control of bluejoint (Calamagrostis canadensis [Michx.] Beauv.) in reforestation areas in British Columbia. 1992. Winder, R.S. Pages 30-36 in C. Dorworth and S.G. Glover, Editors. Biocontrol of Forest Weeds: proceedings of a workshop held at the Western International Forest Disease Work Conference, August 9, 1991, Vernon, B.C. Forestry Canada, Pacific Forestry Centre, Victoria, BC.

Year: 1992

Issued by: Pacific Forestry Centre

Catalog ID: 3289

Language: English

CFS Availability: Order paper copy (free)

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Bluejoint (Calamagrostis canadensis [Michx.] Beauv.) causes problems in northeastern British Columbia reforestation areas that range from competition to snow press. Where it is dominant, it is a weed that can delay spruce development for up to a decade and seriously impair timber production. Bluejoint primarily competes for light and nutrients. In view of the fact that chemical controls such as glyphosate are increasingly unavailable due to public pressure, alternative methods such as biocontrol are needed. At least 90 species of fungi are reported on bluejoint, 30 of which appear to cause some type of epidemic or disease on the weed. It is therefore likely that a fungal or bacterial biocontrol agent could be found using the bioherbicide approach.

The primary objective of biocontrol in this situation would be to reduce competition without eliminating desirable vegetation. About thirty percent of the approximately fifty major bluejoint pathogens have been collected and identified for further testing at the Pacific Forestry Centre in Victoria, British Columbia. Using a standard approach to mycoherbicide development, pathogenicity and virulence tests should lead to preliminary field trials by next year.