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

Tuesday, May 7th at 1:00 PM
Room 202, Crop Science Building

Available in Ridgetown via video conference in RDC boardroom

Thesis Title: Interactions Between Halosulfuron and Other Processing Tomato (Lycopersicon esculentum L.) Herbicides

Advisory Committee                                         
Dr. Darren Robinson, Advisor
Dr. Sikkema, Co-advisor
Dr. Rene VanAcker
Dr. Nader Soltani                                                                                             

Examination Committee
Dr. Gopi Paliyath, Chair 
Dr. François Tardif, External Examiner  
Dr. Darren Robinson
Dr. Peter Sikkema                                                                          

ABSTRACT

Processing tomatoes are an economically important crop in Ontario that can be adversely affected by weed interference. Halosulfuron is a relatively new herbicide that can provide broad-spectrum weed control when applied in a tankmix solution. Halosulfuron can also provide solutions for growers who have triazine-resistant weeds in their fields. Herbicide tankmixes could interact antagonistically or synergistically which could reduce weed control efficacy or injure tomato (respectively). Experiments in Ridgetown, ON were repeated 4 times over 2 years (2015 and 2016) in order to determine if there were any antagonistic or synergistic interactions on tomato injury and weed control efficacy between halosulfuron at three rates (25, 37.5 and 50 g ai ha^-1) and commonly used broadleaf, grass and pre-transplant tomato herbicides. Results found no increase in tomato injury through light attenuation measurements or tomato injury ratings. There were no antagonistic, additive or synergistic interactions between halosulfuron and other broadleaf tomato herbicides. Results did show antagonistic interactions on weed control when halosulfuron was tank-mixed with graminicides. Halosulfuron could provide growers with an additional pre-transplant tool to combat triazine-resitant weeds.