Prevention and Control Options for Glyphosate-Resistant Kochia (Kochia scoparia)

• Author / Creator

  Low, Ryan Harvey

• Glyphosate resistant Kochia scoparia is a growing concern in Canada, and is increasing in incidence. Trials were conducted in naturally occurring glyphosate susceptible kochia populations or in areas seeded with glyphosate susceptible kochia seed. By looking at herbicides with different modes of action that can control kochia as effectively as glyphosate, as well as introducing a new herbicide application window, it may be possible to decrease the occurrence of glyphosate-resistant kochia biotypes from becoming the majority of kochia populations on the Canadian prairies. Fluroxypyr + MCPA ester (a group 4 herbicide), bromoxynil + 2,4D (a combination of group 6 and 4 herbicides), saflufenacil and carfentrazone-ethyl (group 14), pyrasulfotole + bromoxynil (a combination of group 27 and 6 herbicides) were as effective at controlling kochia as glyphosate when applied pre-seeding. It was determined that herbicide effectiveness varies according to location. Introducing a new window of herbicide application in the fall, post-harvest, was not effective at controlling kochia.

• Subjects / Keywords

  • Kochia scoparia
  • Controls
  • Glyphosate resistance

• Graduation date

  Spring 2016

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3VQ2SN14

• 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.