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

Date: Tuesday, March 5, 2019 at 9:30 AM
Location: Room 202, Crop Science Building

Thesis Title: Epidemiology and Management of Stem and Bulb Nematode

Advisory Committee
Dr. Mary Ruth McDonald
Dr. Katerina Jordan
Mr. Michael Celetti

Examination Committee
Dr. Mary Ruth McDonald
Dr. Katerina Jordan
Dr. Cheryl Trueman
 

Examination Chair: Dr. Elizabeth Lee

ABSTRACT

Ditylenchus dipsaci, the stem and bulb nematode, can cause total yield loss to garlic in Ontario and decreases the availability of seed cloves for successive planting. The management and host range of D. dipsaci were investigated, as was the interaction of D. dipsaci and the fungus Fusarium oxysporum f. sp. cepae (Foc), the causal agent of basal plate rot of garlic.  Several new chemistries, applied as seed treatment, in-furrow drench, and seed fumigant, were evaluated for control of D. dipsaci. Fluopyram was the most effective chemistry for suppressing D. dipsaci, and increasing yield.  In greenhouse studies, soybean and wheat were identified as nonhosts of D. dipsaci. and could be useful in crop rotation with garlic. There was an antagonistic interaction between D. dipsaci and Foc.  When Foc was applied first, the severity of basal rot was reduced.  The addition of Foc also reduced nematode reproduction in the plant and soil.