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

  • Author / Creator
    Tidemann, Breanne D
  • 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.

  • Subjects / Keywords
  • Graduation date
    Spring 2014
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. 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.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
  • Specialization
    • Plant Science
  • Supervisor / co-supervisor and their department(s)
  • Examining committee members and their departments
    • Carlyle, Cameron (AFNS)
    • Bork, Edward (AFNS)
    • Beckie, Hugh (AFNS)
    • Johnson, Eric (Agriculture and Agri-food Canada, external to University)