Rhizoctonia root rot caused by Rhizoctonia solani (Kuhn), is the most important problem faced by sugarbeet (Beta vulgaris L.) grm.vers in North Dakota and Minnesota. Research was conducted that may be used to manage the disease. Six cultivars from 2 to 8- leaf stage were evaluated for their ability to withstand infection after soil inoculation by R. solani AG 2-2 IIIB. All leaf stages of the cultivars evaluated were susceptible to R. solani. Sugarbeet plants at the 2-leaf stages were most susceptible and had significantly higher root rot severity than plants at the 4, 6 and 8-leaf stages. Cultivars Crystal 454 and Hillshog 3035 had the lowest root rot severity of the cultivars evaluated, but root rot severity was still greater than 50%. The cultural practice of planting early in soils when the temperature is about 10°C at the 10 cm depth may result in plants being older and more tolerant by the time the pathogen becomes infective at warmer soil temperatures. However, the fact that all plant stages were susceptible to R. solani may require additional protective measures in highly infested fields with a knovm history of severe Rhizoctonia root rot. During greenhouse research, it was observed that azoxystrobin fungicide applied as a hypocotyl drench provided excellent control of Rhizoctonia root rot. It is recommended that growers use a foliar banded application of azoxystrobin at the 4-leaf stage to control Rhizoctonia root rot. Research was conducted to compare and evaluate the effect of foliar band and hypocotyl drench applications of azoxystrobin to control R. solani. The study showed that foliar banded and hypocotyl drench applications of azoxystrobin provided significantly similar disease control under conditions that were ideal for disease development However, disease from plants with a hypocotyl drench application was not significantly different than the non-inoculated control suggesting that further testing should be done to determine the utility of this application methodology in field conditions. Research was conducted to determine the best time to apply azoxystrobin fungicide for effective R. solani control relative to timing of soil inoculation. Sugarbeet hypocotyls were drenched at the 4-leaf stage at 0, 7, 14, 21, and 28 days pre-inoculation and at 0, 3, 10, 14, and 21 days post-inoculation. Azoxystrobin applications prior to inoculation resulted in significantly lower root rot compared to fungicide applications at post inoculation. Among the post inoculation applications, treatments where the fungicide was applied within 2 hours provided the best disease control. Fungicide application at pre-inoculation provided effective control at all timings evaluated: This research reinforces the need for azoxystrobin application before infection to control the disease in field conditions. The depth at which R. solani caused root rot infection of sugarbeet was studied after burying R. solani AG 2-2 IIIB inoculurn at depths of 2.54, 7 .62, and 12. 7 cm. R. solani AG 2-2 IIIB infections occurred at all depths of inoculation. However, inoculum buried at 2.54 cm depth had significantly higher root rot severity than inoculum buried deeper. Root rot symptoms were prevalent on the upper portion of the sugarbeet root just below the soil line irrespective of the depth of inoculurn placement. This suggests that the upper part of the root below the soil line is most vulnerable to R. solani infection. Consequently, in the soil fungicide application should target the root area just below the soil line for effective disease control.