Canadian Forest Service Publications

Application of biological control to vegetation management in forestry. 2000. Shamoun, S.F. Pages 87-96 in N.R Spencer, Editor. Proceedings of the X International Symposium on Biological Control of Weeds, July 4-14, 1999, Bozeman, Montana. Montana State University, Bozeman, USA.

Year: 2000

Issued by: Pacific Forestry Centre

Catalog ID: 5545

Language: English

Availability: PDF (request by e-mail)

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It has been well documented that some plant pathogenic fungi can be developed as inundative biological control agents (mycoherbicides) to suppress native competing forest vegetation in conifer regeneration sites. Biological control agents need to be sufficiently virulent to mitigate the aggressiveness of competing vegetation, while allowing crop trees to compete successfully to the free-to-grow stage. To manage hardwood weeds in conifer regeneration sites and utility rights-of-way, an experiment was conducted to test the efficacy of the wound pathogen Chondrostereum purpureum (Pers.:Fr.) Pouzar as compared to the herbicide Vision®. Results indicate that C. purpureum is as effective as Vision® for control of red alder. In another pathosystem, weedy Rubus spp. are being targeted due to their capacity to rapidly invade reforestation and riparian sites, effectively reducing the growth and survival of young planted and naturally regenerating conifer seedlings. A potential candidate, Fusarium avenaceum (Fr.) Sacc. was selected and applied inundatively on target weeds under greenhouse conditions. Test plants receiving formulated F. avenaceum combined with 0.4% Silwet L-77® induced significant foliar necrosis. These two pathosystems are presented as examples for an applied biocontrol strategy for vegetation management in forestry and will be discussed in detail.