Skip to main content
×
Home
    • Aa
    • Aa

Comparison of a Glyphosate-Resistant Canola (Brassica napus L.) System with Traditional Herbicide Regimes

  • John T. O'Donovan (a1), K. Neil Harker (a2), George W. Clayton (a2) and Robert E. Blackshaw (a3)
Abstract

Herbicide-resistant cultivars account for over 90% of the canola grown in western Canada and cultivars resistant to glyphosate dominate the market. Field experiments were conducted at three locations in Alberta to compare the glyphosate system with more traditional herbicide regimes. Glyphosate applied before seeding in spring resulted in better weed control, lower dockage, and higher canola yield and net return than 2,4-D applied in the fall. Glyphosate applied once (two- to four-leaf canola) or twice (two- to four-leaf followed by five- to six-leaf canola) in-crop provided similar weed control, dockage, and canola yield as ethalfluralin applied PRE in the fall followed by an in-crop mixture of sethoxydim, ethametsulfuron, and clopyralid; and superior weed control and canola yield and lower dockage than ethalfluralin alone or an in-crop mixture of sethoxydim and ethametsulfuron. The in-crop glyphosate applications resulted in higher net revenues than the other treatments. There was little or no advantage to applying glyphosate twice compared with once in-crop. The amount of active ingredient entering the environment varied with the herbicide regime but was lower with the glyphosate system than with most of the traditional regimes, especially when glyphosate was applied only once in-crop.

Copyright
Corresponding author
Corresponding author: John T. O'Donovan
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

P. N. P. Chow , P. A. O'Sullivan , J. H. Hunter , and K. J. Kirkland 1983. Control of barley and wheat in canola with BASF 9052. Can. J. Plant Sci. 63:10991102.

G. W. Clayton , K. N. Harker , J. T. O'Donovan , M. N. Baig , and M. J. Kidnie 2002. Glyphosate timing and tillage system effects on glyphosate-tolerant canola (Brassica napus). Weed Technol. 16:124130.

J. A. Ferrell and W. M. Witt 2002. Comparison of glyphosate with other herbicides for weed control in corn (Zea mays): efficacy and economics. Weed Technol. 16:701706.

H. A. Friesen and K. E. Bowren 1973. Factors affecting the control of wild oats in rapeseed with trifluralin. Can. J. Plant Sci. 53:199205.

K. N. Harker , R. E. Blackshaw , K. J. Kirkland , D. A. Derksen , and D. Wall 2000. Herbicide-tolerant canola: weed control and yield comparisons in western Canada. Can J. Plant Sci. 80:647654.

K. N. Harker , G. W. Clayton , J. T. O'Donovan , R. E. Blackshaw , and F. C. Stevenson 2004. Herbicide timing and rate effects on weed management in three herbicide-resistant canola systems. Weed Technol. 18:10061012.

J. A. Ivany 2004. Comparison of weed control strategies in glyphosate-resistant soybean [Glycine max (L.) Merr.] in Atlantic Canada. Can. J. Plant Sci. 84:11991204.

E. N. Johnson , K. J. Kirkland , and F. C. Stevenson 2002. Timing of pre-seeding glyphosate application in direct-seeding systems. Can. J. Plant Sci. 82:611615.

L. J. Lee and J. Ngim 2000. A first report of glyphosate-resistant goosegrass [Eleusine indica (L.) Gaertn] in Malaysia. Pest Manag. Sci. 56:336339.

P. A. O'Sullivan and V. C. Kossatz 1984. Selective control of Canada thistle in rapeseed with 3,6-dichloropicolinic acid. Can. J. Plant Sci. 62:989993.

R. K. D. Peterson and A. G. Hulting 2004. A comparative ecological risk assessment for herbicides used on spring wheat: the effect of glyphosate when used within a glyphosate-tolerant wheat system. Weed Sci. 52:834844.

K. N. Reddy and K. Whiting 2000. Weed control and economic comparisons of glyphosate-resistant, sulfonylurea-tolerant and conventional soybean (Glycine max) systems. Weed Technol. 14:204211.

D. R. Shaw , J. C. Arnold , C. E. Snipes , D. H. Laughlin , and J. A. Mills 2001. Comparison of glyphosate-resistant and nontransgenic soybean (Glycine max) herbicide systems. Weed Technol. 15:676685.

C. J. Swanton and K. Chandler 1989. Control of wild mustard in canola with POST herbicides. Can. J. Plant Sci. 69:889896.

C. J. Swanton , A. Shreshta , K. Chandler , and W. Deen 2000. An economic assessment of weed control strategies in no-till glyphosate-resistant soybean (Glycine max). Weed Technol. 14:755763.

M. J. VanGessel 2001. Glyphosate resistant horseweed in Delaware. Weed Sci. 49:703705.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords:

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 4 *
Loading metrics...

Abstract views

Total abstract views: 28 *
Loading metrics...

* Views captured on Cambridge Core between 20th January 2017 - 23rd June 2017. This data will be updated every 24 hours.