Location: Sugarbeet and Bean ResearchTitle: Seedling diseases of sugar beet – diversity and host interactions Author
Submitted to: Annual Beet Sugar Development Foundation Research Report
Publication Type: Research Notes
Publication Acceptance Date: 3/31/2017
Publication Date: 4/1/2017
Citation: Hanson, L.E., McGrath, J.M., Goodwill, T.R. 2017. Seedling diseases of sugar beet – diversity and host interactions. Annual Beet Sugar Development Foundation Research Report. Denver, Colorado: Beet Sugar Development Foundation. [CD-ROM].
Technical Abstract: Seedling diseases cause loss of plant stand due to pre- and post-emergence damping-off and weakened plants due to root or hypocotyl infection. Several pathogens cause seedling disease of sugar beet, including Rhizoctonia solani, Aphanomyces cochlioides, Pythium species, and Fusarium species. Resistance to seedling diseases has not been found to correlate with mature plant resistance, and seedling resistance often is separate from adult plant resistance. Resistance to Rhizoctonia damping-off caused by R. solani AG-2-2 was described in a USDA sugarbeet germplasm, thus is an opportunity to improve germplasm and understanding of how pathogens interact with sugar beet at the seedling stage of development. It is not known whether there is any seedling-stage resistance to Fusarium species in sugar beet. Preliminary tests have shown variability in the amount of damage Fusarium isolates cause on beet seedlings and field tests show differences in seedling emergence in Fusarium screening fields. This indicates the potential for resistance to Fusarium damping-off in sugar beet.