Interaction of sugar beet host resistance and rhizoctonia solani AG-2-2 IIIB strains

Strausbaugh, C.A. and Eujayl, Imad A. and Panella, Leonard W. (2013) Interaction of sugar beet host resistance and rhizoctonia solani AG-2-2 IIIB strains. Plant Disease. 97:1175-1180. 9 August 2013.

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Abstract

Rhizoctonia root rot caused by Rhizoctonia solani can cause serious economic losses in sugar beet 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 (response 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. Since most commercial sugar beet cultivars contain low to intermediate resistance to Rhizoctonia root rot, the strain used to screen should be considered in order to maintain consistent responses between nurseries and commercial fields.

Item Type:	Article
NWISRL Publication Number:	1469
Subjects:	Irrigated crops > Sugarbeet > Root rots Irrigated crops > Sugarbeet
Depositing User:	Users 6 not found.
Date Deposited:	13 Aug 2013 20:22
Last Modified:	13 Aug 2013 20:23
Item ID:	1505
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1505