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Preharvest Applications of Glyphosate for Canada Thistle (Cirsium arvense) Control

Published online by Cambridge University Press:  12 June 2017

A. Lloyd Darwent ,
Kenneth J. Kirkland ,
Mirza N. Baig  and
Leonard P. Lefkovitch
A. Lloyd Darwent
Affiliation:
Agric. Canada Res. Stn., Beaverlodge, AB T0H 0C0
Kenneth J. Kirkland
Affiliation:
Agric. Canada Exp. Farm, Scott, SK S0K 4A0
Mirza N. Baig
Affiliation:
Monsanto Canada Inc., Edmonton, AB T6M 1V7
Leonard P. Lefkovitch
Affiliation:
Canada Headquarters, Bldg. 54, Cent. Exp. Farm, Ottawa, ON K1A 0C6
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Abstract

The effectiveness of single and repeated annual preharvest glyphosate applications (1 to 2 wk before crop harvest) to reduce Canada thistle populations was evaluated in field experiments near Bezanson, AB, Scott, SK, and St. Albert, AB. Single applications of glyphosate at 0.45 to 1.8 kg/ha at Bezanson and St. Albert reduced Canada thistle shoot density by more than 75% but in the three experiments at Scott 1.8 kg/ha was required to consistently obtain a similar reduction. Four consecutive, annual applications of glyphosate at 0.45 kg/ha or more did not eliminate Canada thistle but reduced shoot densities by more than 98% at Bezanson. At Scott, similar reductions occurred in two of three sites following two consecutive, annual preharvest applications of glyphosate at the same rates. In the third Scott site the 1.8 kg/ha rate of glyphosate provided a similar reduction but lower rates did not. At Bezanson, barley yields following the first, second, and third applications of glyphosate at 0.45 kg/ha or more were 14% greater than check plots where MCPA was applied in the spring. Yields of wheat seeded 1 yr after a single application of glyphosate at St. Albert were 26% greater than from unsprayed checks. Barley yields seeded 1 yr after each glyphosate application at Scott were not affected because Canada thistle populations were sparse.

Keywords

Glyphosate, N-(phosphonomethyl)glycineMCPA, [(4-chloro-2-methylphenoxy)acetic acid]Canada thistle, Cirsium arvense (L.) Scop. # CIRARbarley, Hordeum vulgare L.wheat, Triticum aestivum L.Harvest aidwheat tolerancebarley tolerancebromoxynilMCPABrassica campestris var. rapiferaPisium sativum var. arvenseLens culinarisCIRAR
Type
Research
Information
Weed Technology , Volume 8 , Issue 3 , September 1994 , pp. 477 - 482
Copyright
Copyright © 1994 by the Weed Science Society of America 

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