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Glyphosate Can Reduce Glyphosate-resistant Canola Growth After Individual or Sequential Applications

Published online by Cambridge University Press:  20 January 2017

Brian S. Schilling ,
K. Neil Harker  and
Jane R. King
Brian S. Schilling*
Affiliation:
Department of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
K. Neil Harker
Affiliation:
Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C & E Trail, Lacombe, AB T4L 1S1, Canada
Jane R. King
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
*
Corresponding author's E-mail: [email protected].
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Abstract

Greenhouse experiments were conducted to determine whether multiple applications of glyphosate and time of glyphosate application with regard to the crop's growth stage had a significant effect on the growth and development of glyphosate-resistant canola. Glyphosate was applied as single applications at the two-, four-, or six-leaf stage of canola; as sequential double applications at the two- and four-, two- and six-, and four- and six-leaf stages of canola; and as a triple application at all three stages. Of the plant growth parameters measured, single applications of glyphosate resulted in significant reductions to stem weight and shoot weight compared with nontreated plants, and multiple applications of glyphosate caused significant reductions to leaf area, leaf weight, stem weight, and shoot weight. Single applications of glyphosate were less injurious to glyphosate-resistant canola compared with multiple applications, and canola growth parameter reductions were greatest after earlier glyphosate applications.

Keywords

Glyphosatecanola, Brassica napus L.Crop injuryherbicide-resistant cropleaf stagemultiple applicationEPSPS, 5-enolpyruvylshikimate-3-phosphate synthaseRH, relative humidity
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 825 - 830
Copyright
Copyright © Weed Science Society of America 

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