Virulence, Distribution and Diversity of Rhizoctonia Solani from Sugar Beet in Idaho and Oregon

Strausbaugh, C.A. and Eujayl, Imad A. and Panella, Leonard W. and Hanson, Linda E. (2011) Virulence, Distribution and Diversity of Rhizoctonia Solani from Sugar Beet in Idaho and Oregon. Canadian Journal of Plant Pathology. 33(2):210-226. 11 March 2011.

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Abstract

Rhizoctonia root rot causes serious losses on sugar beet worldwide. In order to help explain why Rhizoctonia root rot management practices have not performed well in some areas of the Intermountain West (IMW), a survey was conducted. In the IMW from 2004 to 2006, 94 Rhizoctonia solani field isolates were collected from sugar beet roots. These field isolates were compared with 19 reference strains and 46 accessions from GenBank for genetic diversity based on sequencing of the ITS-5.8S rDNA region. Greenhouse pathogenicity tests on sugar beet and silage corn were conducted and plant damage was assessed using a randomized complete block design with at least four replications. The majority (92%) of the isolates had identity with the AG-2-2 IIIB (48%) or AG-4 subgroups (44%). Isolates from AG-2-2 IIIB were the most virulent on sugar beet and had the most diversity in phylogenetic analysis. Seven (all AG-2-2 IIIB) of 18 isolates tested could attack both sugar beet and corn, with two of the isolates causing less root rot than the others. To reduce Rhizoctonia root rot on sugar beet and corn, crop rotations and the isolates utilized for selecting host resistance could be given further consideration.

Item Type:	Article
NWISRL Publication Number:	1387
Subjects:	Irrigated crops > Sugarbeet > Root rots Irrigated crops > Sugarbeet
Depositing User:	Users 6 not found.
Date Deposited:	13 Apr 2011 20:05
Last Modified:	13 Apr 2011 20:06
Item ID:	1417
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1417