|Mcgrath, J Mitchell - Mitch|
Submitted to: Annual Beet Sugar Development Foundation Research Report
Publication Type: Experiment Station
Publication Acceptance Date: 5/1/2004
Publication Date: 6/30/2004
Citation: Nagendran, S., McGrath, J.M. 2004. Rhizoctonia seedling damping off in sugar beets. 2003 Annual Beet Sugar Development Foundation Research Report. p. D13-D17.
Technical Abstract: Diseases caused by Rhizoctonia solani n sugar beets include post-emergence damping off of seedlings, and crown and root rot of mature plants. Sugar beet varieties show varying degree of susceptibility to R. solani. Project goals include development of a reliable method to screen for Rhizoctonia seedling damping off disease, and to screen germplasm for resistance to Rhizoctonia seedling damping off. A screen was developed that showed an initial infection (from zero to 9 days post-inoculation) was characterized by rapid appearance of symptoms, a second phase (from 8 to 13 days of post-inoculation) that was characterized by little disease progression, and a final phase (14 to 18 days post-inoculation) that finalized the outcome of the interaction, either death (compatible interaction) or recovery (incompatible interaction). Application of this test to four germplasm lines showed one, EL51, that appeared to survive both seedling damping off and chronic root rot. This is the first report of seedling resistance to Rhizoctonia in sugarbeet.