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Epidemiology and Management of Stem and Bulb Nematode

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Title: Epidemiology and Management of Stem and Bulb Nematode
Author: Ives, Lilieth; Ives, Lilieth
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: McDonald, Mary RuthMcDonald, Mary Ruth
Abstract: Ditylenchus dipsaci is one of the most destructive pathogens of garlic in Ontario. Ditylenchus dipsaci can cause total yield loss and decreases the availability of seed cloves for successive planting. There are limited options available for management in Canada. The management and host range of D. dipsaci were investigated as was the interaction of D. dipsaci and Fusarium oxysporum f. sp. cepae, 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 their effectiveness to control D. dipsaci. Fluopyram was the most effective chemistry for suppressing D. dipsaci, and increasing yield. In greenhouse studies, soybean and wheat effectively reduced the population density of D. dipsaci. Both antagonistic and no effect interactions occurred between D. dipsaci and F. oxysporum f. sp. cepae. There was a greater reduction in shoot dry weight, and an increase in disease incidence compared to either pathogen alone.
Date: 2019-03
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