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Risk Assessment of Glyphosate Resistance in Western Canada

Published online by Cambridge University Press:  20 January 2017

Hugh J. Beckie ,
K. Neil Harker ,
Linda M. Hall ,
Frederick A. Holm  and
Robert H. Gulden
Hugh J. Beckie*
Affiliation:
, Agriculture and Agri-Food Canada (AAFC) Research Centre, Saskatoon, Saskatchewan, Canada S7N 0X2
K. Neil Harker
Affiliation:
AAFC Research Centre, Lacombe, Alberta, Canada T4L 1W1
Linda M. Hall
Affiliation:
University of Alberta, Edmonton, Alberta, Canada T6G 2P5
Frederick A. Holm
Affiliation:
University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8
Robert H. Gulden
Affiliation:
University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
*
Corresponding author's E-mail: hugh.beckie@agr.gc.ca
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Abstract

With increasing incidence of glyphosate-resistant weeds worldwide, greater farmer awareness of the importance of glyphosate stewardship and proactive glyphosate-resistance management is needed. A Web-based decision-support tool (http://www.weedtool.com) comprising 10 questions has been developed primarily for farmers in western Canada to assess the relative risk of selection for glyphosate-resistant weeds on a field-by-field basis. We describe the rationale for the questions and how a response to a particular question influences the risk rating. Practices with the greatest risk weighting in western Canadian cropping systems are lack of crop-rotation diversity (growing mainly oilseeds) and a high frequency of glyphosate-resistant crops in the rotation. Three case scenarios are outlined—low, moderate, and high risk of glyphosate-resistance evolution. Based on the overall risk rating, three best-management practices are recommended to reduce the risk of glyphosate resistance in weeds.

Con la creciente incidencia en la maleza de resistencia a glifosato a nivel mundial, es necesario crear en los agricultores mayor conciencia sobre la importancia de la vigilancia en el uso glifosato y de su manejo proactivo para evitar la resistencia al herbicida antes mencionado. Se ha desarrollado, primordialmente para los agricultores en el occidente de Canadá, una herramienta en la web de apoyo a decisiones (http://www.weedtool.com) que comprende 10 preguntas para evaluar el riesgo relativo de selección para resistencia a glifosato en maleza, campo por campo. Describimos el porqué de las preguntas y cómo la respuesta a una pregunta en particular influye en la calificación del riesgo. Prácticas con la mayor ponderación de riesgo en los sistemas de cultivo en el occidente de Canadá son: la falta de diversidad en la rotación de cultivos (cultivar oleaginosas principalmente) y una alta frecuencia de cultivos resistentes al glifosato en la rotación. Tres escenarios se describen: evolución de resistencia al glifosato de bajo, moderado y alto riesgo. Basado en el nivel general de riesgo, se recomiendan tres mejores prácticas de manejo para reducir en la maleza, el riesgo de resistencia a glifosato.

Keywords

GlyphosateCrop rotationdecision-support systemgenetically modified cropsherbicide application frequencyherbicide resistanceintegrated weed management
Type
Education/Extension
Information
Weed Technology , Volume 25 , Issue 1 , March 2011 , pp. 159 - 164
Copyright
Copyright © Weed Science Society of America 

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