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United States Department of Agriculture

Agricultural Research Service

Research Project: NONCHEMICAL PEST CONTROL AND ENHANCED SUGAR BEET GERMPLASM VIA TRADITIONAL AND MOLECULAR TECHNOLOGIES Title: Beet curly top resistance of USDA-ARS National Plant Germplasm System plant introductions, 2009

Authors
item Panella, Leonard
item Strausbaugh, Carl

Submitted to: Plant Disease Management Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: January 5, 2011
Publication Date: March 28, 2011
Citation: Panella, L.W., Strausbaugh, C.A. 2011. Beet curly top resistance of USDA-ARS National Plant Germplasm System plant introductions, 2009. Plant Disease Management Reports. 5:FC066. Online publication doi:10.1094/PDMR05.

Interpretive Summary: As part of a national testing program by the Sugar Beet Crop Germplasm Committee, 30 wild beet populations were tested for resistant to curly top at Kimberly, ID in 2009. The testing was done as part of the USDA, Agricultural Research Service’s testing program with two replications, and statistically analyzed to compare the tested populations with a resistant breeding line from Betaseed, Inc., G6040. The plots were rated for symptoms in the foliage using a scale of 0-9 (0 = healthy and 9 = dead). Disease development was uniform and severe. Other disease problems were not evident in the plot area. The wild populations contained a combination of annual and biennial plant types. The resistant check was significantly more resistant than any of the tested germplasms. The two best germplasm were Beta vulgaris subspecies maritima lines, both of which contained biennial plants. However the scores were much higher than the resistant check and do not seem to contain resistance to curly top.

Technical Abstract: Thirty wild beet (Beta vulgaris subsp. maritima (L.) Arcang) accessions from the Beta collection of the USDA-ARS National Plant Germplasm System were screened for resistance to Beet severe curly top virus (BSCTV) in 2009. The curly top evaluation was conducted at the USDA-ARS North Farm in Kimberly, ID which had been in beans in 2008. The germplasm was planted (density of about 143,000 seeds/A) on 18 May. The plots were two rows 10 ft long with 22-in row spacing and arranged in a randomized complete block design with two replications. A resistant breeding line from Betaseed, Inc., G6040, was included as a resistant check. Plant populations were thinned to about 47,500 plants/A on 19 June. Plants were inoculated at the four to six leaf growth stage on 23 June with six viruliferous beet leafhoppers per plant. The plants were sprayed with Lorsban 4E on 7 July to kill the beet leafhoppers. The plots were rated for foliar symptom development using a scale of 0-9 (0 = healthy and 9 = dead) with disease index (DI) treated as a continuous variable. Data were analyzed using the general linear models procedure (Proc GLM-SAS), and least significant difference was used for mean comparisons. Disease development was uniform and severe. Other disease problems were not evident in the plot area. The PIs were a combination of annual and biennial plant types. The resistant check was significantly more resistant than any of the tested germplasms. The two best germplasm were Beta vulgaris subspecies maritima lines, both of which contained biennial plants. However the scores were much higher than the resistant check and do not seem to contain resistance to BSCTV.

Last Modified: 10/21/2014
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