Interested Members of the University Community are invited to attend the Final Oral Examination for the Degree of Master of Science of Meghan Dilliott of the Department of Plant Agriculture 

DATE: Monday, February 7, 2022
TIME: 10:00am 

Via Zoom 
Zoom link: ­­­­­­­https://zoom.us/j/94109682137?pwd=MEU3KzgzdE5GZ0V6SHRjYzV1dStsUT09
Meeting ID: 941 0968 2137
Passcode: 816022 

Thesis Title: “Improving the Level and Consistency of Glyphosate-Resistant Canada Fleabane (­Erigeron canadensis L.) Control in Soybean [Glycine max (L.) Merr.] with Preplant Herbicides” 

Advisory Committee  
Dr. Peter Sikkema (Advisor)   
Dr. David Hooker
Dr. Darren Robinson

Examination Committee
Dr. John Cline (Chair)
Dr. Peter Sikkema
Dr. Darren Robinson
Dr. Francois Tardif                               

ABSTRACT 

Six studies consisting of twenty-four field experiments were conducted in 2020 and 2021 in southwestern Ontario, Canada to investigate how to improve the level and consistency of glyphosate-resistant (GR) Canada fleabane control with herbicides applied preplant to soybean. Study One concluded the addition of saflufenacil or metribuzin to glyphosate plus halauxifen-methyl or pyraflufen-ethyl/2,4-D resulted in a synergistic increase in GR Canada fleabane control and improved the consistency of control. Study Two and Three determined the addition of dicamba or saflufenacil to glyphosate plus bromoxynil and the addition of saflufenacil to glyphosate plus dicamba improved the level and consistency of GR Canada fleabane control. Study Four determined the addition of metribuzin to glyphosate plus glufosinate improved the level and consistency of GR Canada fleabane control. Study Five and Six determined there was no benefit of adding low rates of protoporphyrinogen oxidase (PPO)-inhibiting herbicides to glufosinate to improve GR Canada fleabane control.