Submitted to: Biological and Cultural Tests for Control of Plant Diseases
Publication Type: Peer reviewed journal
Publication Acceptance Date: 1/27/2004
Publication Date: 5/3/2004
Citation: Hanson, L.E., Panella, L.W. 2004. Evaluation of Beta Pis from the USDA-ARS NPGS for resistance to Beet Curly Top virus, 2003.. Biological and Cultural Tests for Control of Plant Diseases. (online) 19:FC013. DOI:10.1094/BC19. Interpretive Summary: Beet Curly top virus is widespread throughout the western United States. It causes beets to be dwarfed with crinkled and rolled leaves. Disease control is largely through the use of disease resistant varieties. Thus the identification of new sources of resistance is important for managing beet curly top. In 2003, 30 Plant Introductions from the USDA-ARS National Plant Germplasm System were tested for resistance to beet curly top virus. The weather was hot and dry this year and the disease severe. Out of the 30 Plant Introductions tested, 5 were not significantly different from the resistant control at the first of two ratings, one of which was not significantly different from the resistant control at the second rating as well.
Technical Abstract: Thirty Plant Introductions (PIs) from the USDA-ARS National Plant Germplasm System were evaluated for resistance to the Beet curly top virus in an artificially inoculated nursery in Kimberly, ID. After the beets emerged, plots were trimmed, thinned, and cultivated. Viruliferous leafhoppers were released to cause an artificial epiphytotic. The field was sprayed two weeks after release to kill the leafhoppers. Plots were visually evaluated and rated on a Disease Index (DI) scale of 0 to 9 (no symptoms to dead) at two different times. An analysis of variance on the disease indices determined that there were highly significant differences (P=0.05) among entries. The summer was very hot and dry and the epiphytotic severe. There were five accessions which were not significantly different from the resistant control at the first rating period and one of these also was not significantly different at the second rating. The resistant and susceptible checks had DIs of 3.8 and 4.8 respectively at the first rating, and 5.0 and 7.3 at the second, while the DIs for the PIs ranged from 4.0 to 6.0 at the first rating and 5.5 to 9.0 at the second.