Abstract
In mid-September, 2011 a field in Morrill County near Bridgeport NE was noted with wilting and yellowing symptoms suggestive of Rhizoctonia root rot. Root symptoms consisted of localized, dry sunken lesions covering brown spongy material penetrating deeply into taproots sharply delimited from healthy beet tissue. The surface tissues of the cankers produced a series of concentric circles. These symptoms are inconsistent with Rhizoctonia root and crown rot disease, but are suggestive of the rarely occurring dry rot canker (DRC). DRC is root disease first identified from Utah in 1921, and has since been reported from California, Colorado, Minnesota, Montana, Nebraska, North Dakota, and Wyoming. The disease is caused by an uncharacterized strain of Rhizoctonia solani, but little else is known about the pathogen or disease due to its rare appearances. To initiate characterization of the pathogen, the internal transcribed spacer (ITS) was sequenced from four strains isolated from separate DRC lesions. Sequence analysis suggests that these isolates are distinct from R. solani anastomosis groups (AGs) that typically cause disease in sugar beet.
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