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Seasonal Susceptibility of Boreal Plants to Glyphosate I. Blue-Joint Grass and Black Spruce

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Seasonal susceptibility and posttreatment recovery of blue-joint grass (Calamagrostis canadensis [Michx.] Beauv.) to glyphosate (N-[phosphonomethyl] glycine) were examined in a young black spruce (Picea mariana [Mill.] B.S.P.) plantation. In 1990, two rates of the herbicide (1.1 and 1.7 kg ae/ha) were applied on July 19, August 1, 15, and 29, and September 10 and 29 using a backpack sprayer. Although differences between rates were marginal, time of application strongly influenced post-treatment cover of blue-joint grass. Compared to the untreated control, glyphosate applied between August 1 and September 10 significantly reduced cover of blue-joint grass for 3 yr after treatment and increased growth of black spruce for at least 5 yr. The optimum period of glyphosate efficacy corresponded to the end of blue-joint grass's full flowering and beginning of aboveground senescence. North. J. Appl. For. 17(4):141–148.

Document Type: Miscellaneous

Affiliations: 1: Canadian Forest Service–Natural Resources Canada, 1219 Queen Street East, Sault Ste. Marie, Ontario, Canada, P6A 5M7 2: Biology Department, Lakehead University, Thunder Bay, Ontario, Canada, P7B 5E1 3: Southern Interior Forest Extension and Research Partnership, Kamloops, British Columbia, Canada, V2C 2J6

Publication date: December 1, 2000

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Northern Journal of Applied Forestry covers northeastern, midwestern, and boreal forests in the United States and Canada.
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