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United States Department of Agriculture

Agricultural Research Service

Research Project: SUGARBEET GERMPLASM DEVELOPMENT AND INNOVATIVE GENETIC AND MANAGEMENT APPROACHES TO REDUCING LOSSES CAUSED BY PATHOGENS

Location: Northwest Irrigation and Soils Research

Title: Influence of tillage systems on Rhizoctonia-bacterial root rot complex in sugar beet

Authors
item Strausbaugh, Carl
item Eujayl, Imad

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: May 14, 2012
Publication Date: July 1, 2012
Citation: Strausbaugh, C.A., Eujayl, I.A. 2012. Influence of tillage systems on Rhizoctonia-bacterial root rot complex in sugar beet. American Phytopathology Society. 102:S4.115.

Technical Abstract: The Rhizoctonia-bacterial root rot complex on sugarbeet caused by Rhizoctonia solani and Leuconostoc mesenteroides can cause significant yield losses. To investigate the impact of different tillage systems on this complex, field studies were conducted from 2009 to 2011. Split blocks with conventional and strip tillage as main plot treatments were arranged in a randomized complete block design with four replications. Within main plots, there were seven treatments (non-inoculated check and six R. solani AG 2-2 IIIB strains). Regardless of tillage, the roots responded in a similar manner for fungal rot (conventional 8% versus strip 7%), bacterial rot (26% versus 34%), total rot (33% versus 41%), neighboring roots infected (1.7 roots versus 1.5 roots), distance spread (157 mm versus 150 mm), and the number of dead plants (12% versus 14%). Strip tillage resulted in 6% more root yield in 2009 (P = 0.087), while conventional tillage resulted in 7% and 27% more root yield in 2010 (P = 0.063) and 2011 (P = 0.012), respectively. The tillage systems influenced disease variables in a similar manner but more studies will be needed to determine their impact on yield. Control for the rot complex should focus on typical Rhizoctonia root rot control measures (crop rotation, in-furrow fungicide applications, irrigation management, and host resistance) while a better understanding of the complex continues to be developed.

Last Modified: 10/1/2014
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