Evaluation of sugar beet hybrids for dual resistance to Rhizomania and Rhizoctonia root rot diseases

In this research, the seeds of 12 sugar beet hybrids along with four control genotypes were planted in microplot conditions. After evaluating the roots against Rhizoctonia solani AG 2-2, the six genotypes that had the lowest amount of fungal infection were selected and tested for their reaction to Rhizomania virus disease. After examining ten soil samples from the farms of Kermanshah province and microplots located in Mahidasht research station, the contamination of the microplots of the experimental site with Rhizomania was confirmed based on serological and molecular methods. The seeds of six selected genotypes were planted in sterile soil and the seedlings were transferred to the microplate at the four-leaf stage. After harvesting, the roots were evaluated for BNYVV contamination using the ELISA method and based on Duncan's comparative test, they were divided into three groups. In general, due to the favorable resistance of the hybrid genotype (SB36*7112)* S1-92309 to both diseases, the use of the parents of this hybrid is suggested to continue for breeding experiments.