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Optimizing Pyroxasulfone Efficacy on Wild Oat (Avena fatua L.) Open Access


Other title
wild oat
Type of item
Degree grantor
University of Alberta
Author or creator
Mangin, Amy R
Supervisor and department
Hall, Linda (Plant Science)
Examining committee member and department
Hall, Linda (Plant Science)
Schoenau, Jeff (University of Sask)
Yang, Rong-Cai (Alberta Agriculture)
Beckie, Hugh (AAFC)
Department of Agricultural, Food, and Nutritional Science
Plant Science
Date accepted
Graduation date
2016-06:Fall 2016
Master of Science
Degree level
Herbicide resistance in wild oat to current herbicidal mechanisms of action is widespread across western Canada. Pyroxasulfone is a soil-applied very long chain fatty acid inhibitor (Group 15/K3) that has recently been registered in Canada and may become a future tool in managing this resistance, but control of wild oats by pyroxasulfone is inconsistent across various cropping systems. Trials were conducted in controlled conditions to investigate the influence of wild oat seed depth, site of pyroxasulfone interception in wild oat seedling and the downward movement of pyroxasulfone in the soil. Field experiments were then conducted to determine influences and interactions of seed depth, tillage and application timing on control of wild oat by pyroxasulfone. Additionally, resistance screening was used to examine resistance patterns of Canadian wild oat populations to pyroxasulfone and sulfentrazone. It was determined that the pyroxasulfone efficacy on wild oat is influenced greatly by position of the seed in the soil profile relative to the concentrated herbicide layer. Deep-seeded wild oats may be able to avoid herbicidal injury because the location of effective site of herbicide/seedling interception is below the concentrated herbicide layer in the soil. The position of the seed in the soil profile and the soil conditions interacted to influence the control of wild oat by pyroxasulfone in the field. Resistance to pyroxasulfone and sulfentrazone was found in a Canadian wild oat population previously selected for resistance to ACCase-, ALS- and fatty acid biosynthesis inhibitors, which may potentially limit pyroxasulfone and sulfentrazone use in managing herbicide-resistant populations.
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Triallate-resistant wild oat (Avena fatua L.): Unexpected resistance to pyroxasulfone and sulfentrazone Ms. Amy R. Mangin, Dr. Linda Hall, Dr. Hugh Beckie » Abstract Canadian Journal of Plant Science, 0, 0, 10.1139/CJPS-2016-0029First report: spotted knapweed (Centaurea maculosa L.) resistance to auxinic herbicides Ms. Amy R. Mangin, Dr. Linda Hall » Abstract Canadian Journal of Plant Science, 0, 0, 10.1139/CJPS-2016-0008

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