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Potential for a Pyroxasulfone and Sulfentrazone Herbicide Combination to Control Herbicide-Resistant Weeds in Field Pea, as Affected by Edaphic Factors Open Access


Other title
Herbicide resistance
Type of item
Degree grantor
University of Alberta
Author or creator
Tidemann, Breanne D
Supervisor and department
Hall, Linda (AFNS)
Examining committee member and department
Bork, Edward (AFNS)
Beckie, Hugh (AFNS)
Carlyle, Cameron (AFNS)
Johnson, Eric (Agriculture and Agri-food Canada, external to University)
Department of Agricultural, Food, and Nutritional Science
Plant Science
Date accepted
Graduation date
Master of Science
Degree level
Herbicide resistance, particularly to Group 2 herbicides (ALS inhibitors) is increasing in incidence in Canada and is problematic in crops such as peas that rely on ALS inhibitors for weed control. Pyroxasulfone, a group 15 herbicide, and sulfentrazone, a group 14 herbicide, show potential to be used in peas for weed control. Investigations were conducted into effective rates and application timings for control of false cleavers and wild oat, effect of organic matter and soil moisture on pyroxasulfone and sulfentrazone efficacy, and the interaction of pyroxasulfone and sulfentrazone when co-applied. It was determined that effective rates vary according to location and that higher levels of soil organic matter require higher herbicide rates for equal efficacy. In addition, both fall and spring applications of pyroxasulfone are effective. Pyroxasulfone and sulfentrazone are additive when applied in combination, but broaden the weed spectrum controlled and aid in herbicide resistance management.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Tidemann BD, Hall LM, Johnson EN, Beckie HJ, Sapsford KL, Raatz LL. 2014. Effect of fall- and spring- applied pyroxasulfone for herbicide resistant weeds in field pea. Weed Technol 28: (in press). Available online:

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