|MCGRATH, J MITCHELL|
Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 31, 1999
Publication Date: March 30, 2000
Interpretive Summary: Beet sugar could be produced more economically if sugarbeet yields were not reduced when Rhizoctonia crown and root rot or Cercospora leaf spot disease struck, or if fungicide applications were not needed to control the leaf spot disease. EL51 sugarbeets have strong resistances to these costly diseases, as well as some resistance to the Aphanomyces blackroot rot found din the same fields. EL51 should contribute to hybrid varieties of the future that meet the demand of the sugar producers for disease resistant sugarbeet with less chemical input. The cost efficiencies resulting from multiple resistance beets are important to sugarbeet farmers and processors because of the reduced expenses to produce sugar in the farming and processing portions of the beet sugar industry.
Technical Abstract: EL51 is a predominantly multigerm sugarbeet line combining extremely high resistance to Rhizoctonia crown and root rot with moderately high resistance to Cerospora leaf spot disease. EL51 was derived from seven F1 plants from a cross of four plants of FC701/5 with a group of 87 plants comprised of 15 mass selected FC701/5 plants and 72 plants from ten families from 1981, 1982, 1983, and 1984 traditional East Lansing germplasm, some with Rhizoctonia resistance breeding history. EL51 is diploid and highly self-sterile. EL51 yielded a sucrose concentration 88 percent of the mean of that of two commercial cultivars ACH185 and HME17 in three tests at Saginaw, MI in 1996 and 1997. EL51 had a Rhizoctonia disease index which showed it to be significantly more resistant than resistant checks FC705/1 and FC712 in the USDA-ARS commercial cultivar evaluation at East Lansing. EL51 had a stand rating of moderately resistant in the 1997 Betaseed summer root rot (Aphanomyces) evaluation at Shakopee, MN.