ARS | Publication request: Peanut genotype and seeding rate effect on tomato spotted wilt

Submitted to: Plant Health Progress
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: February 15, 2012
Publication Date: February 25, 2012
Citation: Culbreath, A.K., Branch, W.D., Beasley, Jr, J.P., Tubbs, R.S., Holbrook Jr, C.C. 2012. Peanut genotype and seeding rate effect on tomato spotted wilt. Plant Health Progress. DOI:10.1094/PHP-2012-0227-03-RS.

Interpretive Summary: Tomato spotted wilt virus (TSWV) can cause devastating yield losses in peanut, particularly when susceptible varieties are grown at low plant densities. One objective of this study was to compare the effect of seeding rate and the resultant plant density within the row on spotted wilt in the moderately susceptible cultivar Georgia Green and four new advanced breeding lines. An equally important objective was to determine if field resistance in these lines is sufficient to allow use of reduced seeding rates compared to the standard rate of 6 seed per foot of row typically used for Georgia Green. All of the breeding lines had significantly higher resistance to TSWV in comparison to Georgia Green. The yields for these breeding lines at the lower seeding rate were higher than the yield of Georgia Green at the higher seeding rate. Farmers will be able to save costs and increase profitability by using lower seeding rates with these highly resistant lines.

Technical Abstract: Field experiments were conducted at Tifton, Georgia in 2008-2009 in which seven peanut (Arachis hypogaea L.) genotypes were combined in factorial arrangement with two seeding rates, 9.8 and 19.7 seed/m of row, to determine the effect of seeding rate and genotype on incidence of tomato spotted wilt, caused by Tomato spotted wilt virus (TSWV), and peanut yield. Genotypes included the cultivars Georgia Green, Georgia-01R, and Georgia-02C, and four advanced breeding lines GA 0525524, GA 052527, GA 052529, and C724-19-25. Across years and genotypes, final incidences of tomato spotted wilt were lower, and yields were higher in all lines than in the moderately TSWV-resistant cultivar Georgia Green. Final incidence of tomato spotted wilt was lower in GA 052524, GA 052527, GA 052529 than in any of the three released cultivars, and yields of all four breeding lines were higher than for any of the three cultivars.