|MCGRATH, J MITCHELL|
|Derrico, Cathy - FORMER ARS TECHNICIAN|
Submitted to: Annual Beet Sugar Development Foundation Research Report
Publication Type: Other
Publication Acceptance Date: August 1, 2000
Publication Date: N/A
Technical Abstract: The objective of this test was to examine field emergence in a range of Beta germplasm to evaluate for early resistance to seedling diseases. 114 entries were drawn from germplasm held in the USDA National Germplasm System, and an additional 11 from recent East Lansing releases. The test was divided between two fields, one with a history of seedling emergence problems. All major groups of seedling disease fungi were isolated here i 1999, with Pythium being particularly prevalent. Emergence counts were taken five times between the time of first emergence on May 12 until June 10. Field selections were based on a number of criteria, including (i) high stand persistence relative to maximal emergence in both tests, (ii) high persistence in good and disease plots, and (iii) final stand evaluations in September 1999. Accessions with reasonable emergence scores but showing severe Rhizoctonia damage were excluded from selections at this stime, as were accessions that flowered during the season. Twenty-three lines were selected for further improvement.