Submitted to: Journal of Sugar Beet Research
Publication Type: Abstract Only
Publication Acceptance Date: November 21, 2012
Publication Date: November 26, 2013
Citation: Strausbaugh, C.A., Eujayl, I.A., Panella, L.W. 2013. Interaction of sugarbeet host resistance and Rhizoctonia solani AG-2-2 IIIB strains. Journal of Sugar Beet Research. 50(3&4):83. Technical Abstract: The Rhizoctonia root rot caused by Rhizoctonia solani can cause serious economic losses in sugarbeet fields. Preliminary evidence suggests there could be interactions between different strains and resistance sources. Thus, field studies were conducted to determine if nine R. solani AG-2-2 IIIB strains varied for virulence when compared with a non-inoculated check and interacted with five sugar beet lines (four resistant lines and a susceptible check). The studies were arranged in a randomized complete block design with six replications. Roots were evaluated for surface rot and internal fungal and bacterial rot in September. All strains were virulent on the susceptible check, FC901/C817, and had the same ranking (r = 1.0) regardless of disease variable. Line FC709-2 was resistant (strain responses were not different from non-inoculated check; P > 0.1042) to all strains, while the strain responses resulted in weak interactions with less resistant lines in 14 of 19 variable-year combinations. The ranking of strains compared across lines within a disease variable was frequently correlated, but when compared across disease variables the strain ranking tended to differ. Since most commercial sugarbeet cultivars contain low to intermediate resistance to Rhizoctonia root rot, the strain used to screen should be given consideration in order to maintain consistent responses between nurseries and commercial fields.