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Management Practices Influencing Herbicide Resistance in Wild Oat

Published online by Cambridge University Press:  20 January 2017

Hugh J. Beckie ,
Linda M. Hall ,
Scott Meers ,
James J. Laslo  and
F. Craig Stevenson
Hugh J. Beckie*
Affiliation:
Saskatoon Research Centre, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, Canada S7N 0X2
Linda M. Hall
Affiliation:
Alberta Agriculture, Food and Rural Development/University of Alberta, 410 Agriculture/Forestry Building, Edmonton, AB, Canada T6G 2P5
Scott Meers
Affiliation:
Alberta Agriculture, Food and Rural Development, 280B Ridge Road, Strathmore, AB, Canada T1P 1B6
James J. Laslo
Affiliation:
Wheatland County Agricultural Service Board, Highway 1, Rural Route 1, Strathmore, AB, Canada T1P 1J6
F. Craig Stevenson
Affiliation:
142 Rogers Road, Saskatoon, SK, Canada S7N 3T6
*
Corresponding author's E-mail: [email protected]
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Abstract

A 3-yr study was conducted in Wheatland County, Alberta to determine if agronomic practices of growers influenced the occurrence of herbicide resistance in wild oat. Wild oat seeds were collected in 33 fields in 1997 and in 31 fields in each of 1998 and 1999 (one field per grower). Seedlings were screened for resistance to two acetyl-CoA carboxylase (ACCase) inhibitors, imazamethabenz, an acetolactate synthase (ALS) inhibitor, and triallate, a thiocarbamate herbicide. A questionnaire on herbicide resistance awareness and management practices was completed by each grower. Both ACCase and ALS inhibitor resistance in wild oat were linked to a lack of crop rotation diversity. In addition, ALS inhibitor–resistant wild oat was associated with conservation-tillage systems and recent use of herbicides with that mode of action. Results of this study suggest that timely tillage and inclusion of fall-seeded and perennial forage crops in rotations will effectively slow the selection of resistance in this grass species.

Keywords

Imazamethabenztriallatewild oat, Avena fatua L. # AVEFAHerbicide rotationintegrated weed managementsurveyfenoxapropsethoxydimACCase, acetyl-CoA carboxylaseALS, acetolactate synthase
Type
Extension/Outreach
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 853 - 859
Copyright
Copyright © Weed Science Society of America 

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