Submitted to: Annual Beet Sugar Development Foundation Research Report
Publication Type: Research Notes
Publication Acceptance Date: May 15, 2011
Publication Date: July 15, 2011
Citation: McGrath, J.M., Hanson, L.E. 2011. Sugar beet activities of the USDA-ARS East Lansing conducted in cooperation with Saginaw Valley Bean and Beet Farm during 2010 [CD-ROM]. 2011 Annual Beet Sugar Development Foundation Research Report. Denver, Colorado: Beet Sugar Development Foundation. Technical Abstract: Cercospora leaf spot resistance evaluation plots were planted at the Saginaw Valley Research & Extension Center in Frankenmuth, MI in 2010. All trials were planted, following normal fall and spring tillage operations, with a USDA-ARS modified John Deere/Almaco research plot planter utilizing global positioning with real time kinematic correction signals. Beetcast Advisory daily severity values accumulated in the Frankenmuth area from May 15 to August 26 was 156. Disease severity peaked by late August, after which regrowth started to outpace new disease development, so that disease ratings for several accessions remained constant or decreased after that rating, thus ratings are not given after this date. At the August 19 rating, means of the resistant and susceptible internal control for the entire nursery were 3.2 and 5.5 (scale of 0-10), respectively, across the nursery. At the peak of the epidemic in 2009 (September 9), these means were 2.5 and 5.3 respectively. 192 breeding lines were tested in one- or two-row, three-replication plots from USDA collaborators from Fargo, ND, Salinas, CA, and Ft. Collins, CO. East Lansing USDA entries included 791 entries, including 79 open-pollinated accessions and 712 (partially) inbred lines. Eight East Lansing entries had rating of 4 or less, indicating good resistance in these lines. In addition, the full range of scores was observed in inbreds being developed as Recombinant Inbred Lines that will lead to precision mapping of the genetic determinant of leaf spot resistance.