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Diverse Rotations and Optimal Cultural Practices Control WildOat (Avena fatua)

Published online by Cambridge University Press:  20 January 2017

K. Neil Harker ,
John T. O'Donovan ,
T. Kelly Turkington ,
Robert E. Blackshaw ,
Newton Z. Lupwayi ,
Elwin G. Smith ,
Eric N. Johnson ,
Denis Pageau ,
Steven J. Shirtliffe  and
Robert H. Gulden
...Show all authors
K. Neil Harker*
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Lacombe Research Centre, 6000 C & E Trail, Lacombe, Alberta, Canada T4L 1W1
John T. O'Donovan
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Lacombe Research Centre, 6000 C & E Trail, Lacombe, Alberta, Canada T4L 1W1
T. Kelly Turkington
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Lacombe Research Centre, 6000 C & E Trail, Lacombe, Alberta, Canada T4L 1W1
Robert E. Blackshaw
Affiliation:
AAFC, Lethbridge, Alberta, Canada T1J 4B1
Newton Z. Lupwayi
Affiliation:
AAFC, Lethbridge, Alberta, Canada T1J 4B1
Elwin G. Smith
Affiliation:
AAFC, Lethbridge, Alberta, Canada T1J 4B1
Eric N. Johnson
Affiliation:
University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8
Denis Pageau
Affiliation:
AAFC, Normandin, Quebec, Canada G8M 4K3
Steven J. Shirtliffe
Affiliation:
University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8
Robert H. Gulden
Affiliation:
University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N
John Rowsell
Affiliation:
University of Guelph, New Liskeard, Ontario, Canada P0J 1P0
Linda M. Hall
Affiliation:
twelfth author: Professor, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
Christian J. Willenborg
Affiliation:
University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8
*
Corresponding author's E-Mail: neil.harker@agr.gc.ca
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Abstract

In western Canada, more money is spent on wild oat herbicides than on anyother weed species, and wild oat resistance to herbicides is the mostwidespread resistance issue. A direct-seeded field experiment was conductedfrom 2010 to 2014 at eight Canadian sites to determine crop life cycle, cropspecies, crop seeding rate, crop usage, and herbicide rate combinationeffects on wild oat management and canola yield. Combining 2× seeding ratesof early-cut barley silage with 2× seeding rates of winter cereals andexcluding wild oat herbicides for 3 of 5 yr (2011 to 2013) often led tosimilar wild oat density, aboveground wild oat biomass, wild oat seeddensity in the soil, and canola yield as a repeated canola–wheat rotationunder a full wild oat herbicide rate regime. Wild oat was similarly wellmanaged after 3 yr of perennial alfalfa without wild oat herbicides.Forgoing wild oat herbicides in only 2 of 5 yr from exclusively summerannual crop rotations resulted in higher wild oat density, biomass, and seedbanks. Management systems that effectively combine diverse and optimalcultural practices against weeds, and limit herbicide use, reduce selectionpressure for weed resistance to herbicides and prolong the utility ofthreatened herbicide tools.

Keywords

Wild oat, Avena fatua L.alfalfa, Medicago sativa L.barley, Hordeum vulgare L.canola, Brassica napus L.wheat, Triticum aestivum L.Alternative weed managementcombined practicescrop life cycleherbicide resistanceintegrated weed managementperennial forageselection pressure

Information

Type
Weed Management
Information
Weed Science , Volume 64 , Issue 1 , March 2016 , pp. 170 - 180
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Adam Davis, USDA-ARS.

References

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