Selection for resistance to the rhizoctonia-bacterial root rot complex in sugar beet

Strausbaugh, C.A. and Eujayl, Imad A. and Foote, P. (2013) Selection for resistance to the rhizoctonia-bacterial root rot complex in sugar beet. Plant Disease. 97:93-100. 1 January 2013.

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Abstract

The Rhizoctonia-bacterial root rot complex continues to be a concerning problem in sugar beet production areas. To investigate resistance to this complex in 26 commercial sugar beet cultivars, field studies and greenhouse studies with mature roots from the field were conducted with Rhizoctonia solani AG-2-2 IIIB strains and Leuconostoc mesenteroides. Based on means for the 26 cultivars in the 2010 and 2011 field studies, fungal rot ranged from 0 to 8%, bacterial rot ranged from 0 to 37%, total rot ranged from 0 to 44%, and surface rot ranged from 0 to 52%. All four rot variables resulted in significant (P < 0.0001) cultivar differences. Based on regression analysis, strong positive relationships (r2 from 0.6628 to 0.9320; P < 0.0001) were present among the rot variables. When ranking cultivars, the most consistent rot variable was surface rot, since 12 out of 13 variable-year combinations had significant (P < 0.05) correlations. When cultivar ranking in the greenhouse assays were compared, there was frequently a good positive correlation with storage data but when compared with field results there was no relationship. Thus with this root rot complex, the greenhouse assays related to storage and did not substitute for conducting field screening.

Item Type:	Article
NWISRL Publication Number:	1440
Subjects:	Irrigated crops > Sugarbeet > Root rots Irrigated crops > Sugarbeet Irrigated crops > Sugarbeet > Root rots > Bacteria
Depositing User:	Users 6 not found.
Date Deposited:	10 Dec 2012 23:19
Last Modified:	28 Dec 2012 17:52
Item ID:	1475
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1475