Submitted to: National Sweetpotato Collaborators Group Progress Report
Publication Type: Other
Publication Acceptance Date: November 27, 2007
Publication Date: January 19, 2008
Citation: Jackson, D.M. 2008. Resistance of Sweetpotato Genotypes to Soil Insects, Charleston, SC, 2007. Page 43 In K. Pecota (ed.), National Sweetpotato Collaborators Group Progress Report, 2007. Technical Abstract: Damage by soil insect pests was evaluated for 12 sweetpotato genotypes as part of the National Sweetpotato Collaborator’s Group Test at the U. S. Vegetable Laboratory in 2007. Sweetpotato entries were Beauregard (B63 and B94-14), Evangeline (L99-35), L01-29, L02-32, Covington, NC Japanese, NC99-573, Ruddy, Liberty, Charleston Scarlet, and SC1149-19. Four replications of each entry were grown in single-row, 25-plant plots. Plots were planted on June 15, 2007 and they were harvested on October 16, 2007 for a 123-day growing period. Roots were cured for 10 days at 34°C, washed, and rated for insect damage, including the WDS complex (Wireworm, Diabrotica, Systena), sweetpotato flea beetle, white grub larvae, and sweetpotato weevil. Analyses of variance indicated that there were highly significant entry effects for WDS index, percent undamaged roots, flea beetle ratings, grub ratings, and sweetpotato weevil ratings. Five genotypes had a significantly higher percentage of undamaged roots than the susceptible control, SC1149-19. Four entries had significantly lower WDS ratings than SC1149-19. Five genotypes had significantly lower infestation levels of flea beetles than SC1149-19, including both Beauregard entries. Nine of the sweetpotato genotypes had significantly less damage to sweetpotato weevils than SC1149-19. Overall, the most resistant genotypes were Ruddy, Charleston Scarlet, and L01-29.