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(M13) SWEET POTATO: Ipomoea batatas (L.) Lam EVALUATION OF ADVANCED SWEET POTATO ENTRIES FOR RESISTANCE TO SOIL INSECT PESTS, 2000 D. Michael Jackson and J. R. Bohac USDA-ARS U. S. Vegetable Laboratory 2875 Savannah Highway Charleston, SC 29414 Phone: (843) 556-0840 Fax: (843) 763-7013 E-mail: mjackson@awod.com E-mail: jbohac@awod.com J. D. Mueller Clemson University Edisto Research and Education Center Blackville, SC 29817 Spotted cucumber beetle: Diabrotica undecimpunctata howardi Barber Banded cucumber beetle: Diabrotica balteata LeConte Sweetpotato flea beetle (SPFB): Chaetocenema confinis Crotch Elongate flea beetle: Systena elongata (F.) Wireworms: Conoderus spp. White grubs: Phyllophaga spp. and Plectris aliena Chapin Cuttings of four insect-susceptible check cultivars ('Beauregard', 'Carolina Bunch', 'Hernandez', and SC1149-19), an intermediate check ('Jewel'), two insect-resistant checks ('Regal' and 'Sumor'), and 26 advanced entries developed by the USDA-ARS at the U.S. Vegetable Laboratory (USVL), Charleston, SC, were planted at the USVL on 14 Jun. Four replications of each entry were grown in single-row, 10-plant plots arranged in an RCB experimental design. Normal production practices were followed, except that no insecticides were applied. When rainfall was not adequate during the growing season, supplemental irrigation was applied. Plots were harvested on 17 Oct (125 days after planting). Yields were typical for the check varieties. Individual roots were evaluated for insect damage by the WDS complex (wireworm, Diabrotica, Systena), SPFB, and white grub larvae. WDS severity index was calculated by averaging the rating given to each root (1 = 1-5 holes or scars, 2 = 6-10 holes, 4 = > 10 holes). Flea beetle and grub data were the percentages of total roots that showed any damage by these insects. The percentages of uninjured roots (undamaged by any of the soil insect pests) were also determined for each entry. Data were subjected to ANOVA, and means were separated by DMRT at the 5% probability level for type I errors. Many advanced entries exhibited high levels of resistance to soil insect pests (Table 1). ANOVA indicated that there were highly significant entry effects for WDS index, the percent of uninjured roots, percent flea beetle infestations, and percent grub infestations. There were no significant replication effects for any of the parameters. All entries had significantly lower infestations of WDS, flea beetles, and white grubs, and a higher percentage of uninjured roots than SC1149-19. All entries, except SC1149-19, had a lower WDS rating than Beauregard. Twenty-six entries had a significantly lower percentage of flea beetles, and 19 entries had a significantly lower percentage of grubs than Beauregard. Twenty-six entries were as resistant as Regal and Sumor, the resistant checks, for WDS, flea beetles, and grubs.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2002
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