Soilborne plant pathogens reduce both environmental and economic sustainability due to the need for pesticide applications, and crop loss when disease management is not successful. Modern plant disease management programs must consider impacts to long-term crop and soil health as well as product efficacy to provide long-term solutions. A deeper understanding of the relationship between soil microbial communities and host crops can help to meet these goals. In New York, the fungus Rhizoctonia solani causes damping off and root rot in table beet. Current management in conventional production systems relies solely on the fungicide azoxystrobin, while options for organic production are even more limited. This dissertation research seeks to support steps toward sustainable disease management by characterizing bacteria and fungi associated with table beet in field trials and surveys. More diverse microbial communities are hypothesized to be associated with increased community stability and improved plant health. Bacteria and fungi in the table beet rhizosphere and phyllosphere were characterized from nine fields in central and western New York. Community analysis based on abundance and enrichment revealed taxa that were part of the core microbiome, mainly bacteria in Proteobacteria and fungi in Ascomycota. The effect of azoxystrobin and R. solani on the soil and rhizosphere microbiome was assessed with replicated field trials in 2021 and 2022. Differences in community composition and structure related to either in-furrow azoxystrobin application or post-emergent R. solani inoculum were not significant. A series of replicated trials compared the efficacy of multiple conventional fungicides and biological products to azoxystrobin, the current industry standard. The selected biological products were not as effective as azoxystrobin or other conventional products but may still play a role in disease management in organic table beet production. These product efficacy studies deliver research-based information and immediately usable strategies for growers to control R. solani in table beet in New York. The microbiome data will guide future investigations into the potential for microbiome-mediated disease control and provides a platform for future studies to further elucidate the impact of agricultural management practices on soil and crop-associated microbiomes.