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Control of Volunteer Canola with Herbicides: Effects of Plant Growth Stage and Cold Acclimation

Published online by Cambridge University Press:  20 January 2017

Anne Légère ,
Marie-Josée Simard ,
Eric Johnson ,
F. Craig Stevenson ,
Hugh Beckie  and
Robert E. Blackshaw
Anne Légère*
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK, Canada S7N 0X2
Marie-Josée Simard
Affiliation:
Agriculture and Agri-Food Canada, 2560 Hochelaga Boulevard, Sainte-Foy, QC, Canada G1V 2J3
Eric Johnson
Affiliation:
Agriculture and Agri-Food Canada, Scott Research Farm, P.O. Box 10, Scott, SK, Canada S0K 0C6
F. Craig Stevenson
Affiliation:
142 Rogers Road, Saskatoon, SK, Canada S7N 3T6
Hugh Beckie
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK, Canada S7N 0X2
Robert E. Blackshaw
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
*
Corresponding author's E-mail: legerea@agr.gc.ca
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Abstract

Phenoxy herbicides are frequently used to control volunteer canola populations. However, there have been claims that poor control could be due to cold acclimation of canola plants in the spring. The objective of this study was to determine whether cold acclimation or growth stage affected the response of canola volunteers to herbicides. In a growth room experiment, canola plants were prehardened and cold acclimated or were grown at 20/12 C and treated with one of six 2,4-D doses. Cold acclimation as achieved by this experiment affected upper and lower asymptotes of the dose–response curve but not the herbicide dose required to reduce canola weight by 50% relative to the nontreated control (GR50), indicating limited cold-related effects on canola tolerance to 2,4-D. Field experiments, conducted in the provinces of Québec and Saskatchewan, examined the effects of canola growth stage on the efficacy of 2,4-D, MCPA, and carfentrazone. Comparisons of the estimates from the dose–response curves confirmed that herbicide efficacy was consistently greater when canola plants were treated at an early growth stage, regardless of cultivar or herbicide used. The GR50 estimates for canola plants treated at a later growth stage exceeded the recommended rates. Some canola plants grown as volunteers in a wheat crop survived 2,4-D or MCPA treatments at 0.5× and 1× rates and produced up to 148 seeds/m2. Efficient control of canola volunteers will be obtained when plants are sprayed at an early growth stage, but near-total control will be highly desirable in order to restrict seedbank buildup, particularly when dealing with canola cultivars with different herbicide-resistant traits.

Keywords

Canola, Brassica napus L.wheat, Triticum aestivum L.Phenoxy herbicides2,4-DMCPAcarfentrazoneBrassica napus, volunteer canolaCA, cold acclimatedDAE, days after emergenceGR50, herbicide dose required to reduce canola weight by 50% relative to the nontreated controlNA, nonacclimatedPAR, photosynthetic photon flux density
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 2 , June 2006 , pp. 485 - 493
Copyright
Copyright © Weed Science Society of America 

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