This study analyzed the growth of rhizomania-tolerant and susceptible sugar beet cultivars grown under infested and non-infested soil conditions. Results showed that under infested soil, susceptible cultivars produced 57% less root dry matter and 24% lower leaf area index than tolerant cultivars. Growth rates including crop growth rate and net assimilation rate were also lower for susceptible cultivars under infested conditions compared to tolerant cultivars. However, on non-infested soil, there were no significant differences in dry matter or growth indices between susceptible and tolerant cultivars. The study quantified the effects of rhizomania infection on sugar beet growth to provide data for modeling rhizomania impacts