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Environmental Impact of Glyphosate-Resistant Weeds in Canada

Published online by Cambridge University Press:  20 January 2017

Hugh J. Beckie ,
Peter H. Sikkema ,
Nader Soltani ,
Robert E. Blackshaw  and
Eric N. Johnson
Hugh J. Beckie*
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Saskatoon Research Centre, 107 Science Place, Saskatoon, Saskatchewan S7N 0X2, Canada
Peter H. Sikkema
Affiliation:
University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, Ontario N0P 2C0, Canada
Nader Soltani
Affiliation:
University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, Ontario N0P 2C0, Canada
Robert E. Blackshaw
Affiliation:
AAFC, Lethbridge Research Centre, P.O. Box 3000, 5403 1st Avenue South, Lethbridge, Alberta T1J 4B1, Canada
Eric N. Johnson
Affiliation:
AAFC, Scott Research Farm, P.O. Box 10, Scott, Saskatchewan S0K 4A0, Canada
*
Corresponding author's E-mail: hugh.beckie@agr.gc.ca
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Abstract

Glyphosate-resistant (GR) giant ragweed, horseweed, and common ragweed were confirmed in southwestern Ontario, Canada in 2008, 2010, and 2011, respectively. In the western prairie provinces of Alberta and Saskatchewan, GR (plus acetolactate synthase inhibitor-resistant) kochia was discovered in 2011. This symposium paper estimates the environmental impact (EI) of the top herbicide treatments or programs used to manage these GR weed species in the major field crops grown in each region. For each herbicide treatment, EI (per ha basis) was calculated as the environmental impact quotient (EIQ), which quantifies the relative potential risk of pesticide active ingredients on human and ecological health based on risk components to farm workers, consumers, and the environment, multiplied by the application rate (kg ai ha−1). Total EI is defined as EI (per ha basis) multiplied by the application area (i.e., land area affected by a GR weed). It was assumed that all herbicide treatments would supplement the continued usage of glyphosate because of its broad spectrum weed control. For the control of these GR weeds, most treatments contain auxinic or protoporphyrinogen oxidase (PPO)-inhibiting herbicides. The majority of auxinic herbicide treatments result in low (EI ≤ 10) to moderate (11 to 20) EI, whereas all treatments of PPO inhibitors have low EI. Total EI of GR horseweed and kochia will generally be greater than that of giant or common ragweed because of rapid seed dispersal. For recommended herbicide treatments to control GR weeds (and herbicide-resistant weeds in general), EI data should be routinely included with cost and site of action in weed control extension publications and software, so that growers have the information needed to assess the EI of their actions.

Keywords

Glyphosatecommon ragweed, Ambrosia artemisiifolia L. AMBELgiant ragweed, Ambrosia trifida L. AMBTRhorseweed, Conzya canadensis (L.) Cronq. ERICAkochia, Kochia scoparia (L.) Schrad. KCHSC, synonym: Bassia scoparia (L.) A.J. Scott.ALS-inhibitor resistanceenvironmental healthglyphosate resistanceherbicide resistancemultiple resistancepesticide toxicity
Type
Symposium
Information
Weed Science , Volume 62 , Issue 2 , June 2014 , pp. 385 - 392
Copyright
Copyright © Weed Science Society of America 

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