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Selective Weed Control with Glyphosate in Glyphosate-Resistant Spring Wheat (Triticum aestivum)

Published online by Cambridge University Press:  20 January 2017

Robert E. Blackshaw  and
K. Neil Harker
Robert E. Blackshaw*
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge AB, Canada
K. Neil Harker
Affiliation:
Agriculture and Agri-Food Canada, Lacombe AB, Canada
*
Corresponding author's E-mail: blackshaw@em.agr.ca
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Abstract

Glyphosate-resistant spring wheat is being developed and may soon be available to growers. Field experiments were conducted to examine the effect of various rates and application timings of glyphosate on the tolerance of glyphosate-resistant spring wheat and the level of weed control attained with glyphosate in wheat. Glyphosate-resistant wheat exhibited excellent tolerance to glyphosate applied at the one- to two- or four- to five-leaf stages at rates up to 1,780 g ae/ha, representing a fourfold safety margin to the proposed field use rate. Glyphosate at 445 g/ha reduced shoot biomass of green foxtail, wild oat, redroot pigweed, and wild mustard > 95% in glyphosate-resistant wheat in all years, but wild buckwheat biomass was only reduced 67 to 75% at doses up to 890 g/ha. Glyphosate applied in-crop at 667 g/ha reduced quackgrass biomass by 97 to 99%. Comparison of glyphosate with other spring wheat herbicides indicated that glyphosate provided similar or better in-crop control of several weed species. Yield of weed-infested glyphosate-resistant spring wheat responded positively to glyphosate in all years.

Keywords

Glyphosategreen foxtail, Setaria viridis (L.) Beauv. #3 SETVIquackgrass, Elytrigia repens (L.) Nevski # AGRREredroot pigweed, Amaranthus retroflexus L. # AMAREwild buckwheat, Polygonum convolvulus L. # POLCOwild mustard, Brassica kaber (DC.) L.C. Wheeler # SINARwild oat, Avena fatua L. # AVEFAspring wheat, Triticum aestivum L. ‘Bobwhite’, ‘BW251’Herbicide resistancewheat tolerancewheat yield
Type
Commentary
Information
Weed Technology , Volume 16 , Issue 4 , December 2002 , pp. 885 - 892
Copyright
Copyright © Weed Science Society of America 

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