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

Date: Tuesday, December 13th, 2022
Time: 9:00am
Location: Room 307 Crop Science Building
Zoom link for remote participants: https://zoom.us/j/91560729624?pwd=VnhZWkNJU1I4RHpVdzJRdWxXSDIyUT09
Meeting ID: 915 6072 9624
Passcode: 914692 

Thesis Title: “Optimization of Weed Control in E3™️ Soybean [Glycine max. (L.) Merr.]” 

Advisory Committee  
Dr. Peter Sikkema, Advisor
Dr. David Hooker
Dr. Darren Robinson
Rob Miller

Examination Committee
Dr. Melanie Kalischuk, Chair
Dr. Peter Sikkema
Dr. Darren Robinson
Dr. Francois Tardif

ABSTRACT 

Twenty field experiments were conducted from 2021-2022 at nine locations in Ontario, Canada to optimize weed control in E3™️soybean. Two studies compared one- and two-pass weed control programs for control of glyphosate-resistant (GR) Canada fleabane and multiple herbicide-resistant (MHR) waterhemp. Two-pass weed control programs provided greater control of GR Canada fleabane and MHR waterhemp. One study investigated herbicide interactions for volunteer corn control in E3™️ soybean. The co-application of 2,4-D choline or dicamba with quizalofop-p-ethyl or clethodim resulted in antagonistic herbicide interactions and reduced control. Glufosinate co-applied with quizalofop-p-ethyl or clethodim resulted in a synergistic interaction. The effect of glufosinate rate, the addition of AMS, and weed size at application was established for five annual weed species. The effect of glufosinate rate, the addition of AMS, and weed size at application is weed species specific. Generally, control is improved with increased rate and reduced weed size at application.