Feeding and oviposition preferences of sweet potato weevil,Cylas formicarius elegantulus (Summers), on storage roots of sweet potato cultivars with differing surface chemistries |
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| Authors: | Stephen F. Nottingham Ki -Cheol Son David D. Wilson Ray F. Severson Stanley J. Kays |
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| Affiliation: | (1) Department of Horticulture, University of Georgia, 30602 Athens, Georgia;(2) ARS, USDA, Tobacco Quality and Safety Research Unit, 30613 Athens, Georgia;(3) Present address: Department of Pure and Applied Biology, Imperial College at Silwood Park, SL5 7PY Ascot, Berks, UK |
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| Abstract: | ![]()
Cores from sweet potato [Ipomoea batatas (L.) Lam.] storage roots (Centennial, Jewel, Resisto, and Regal cultivars) were presented to sweet potato weevils [Cylas formicarius elegantulus (Summers) (Coleoptera; Curculionidae)] in multiple-choice, limited-choice, and no-choice bioassays. Centennial, a susceptible cultivar in field-plot experiments, was preferred for feeding and oviposition by female weevils in choice bioassays, and for ovi-position in no-choice bioassays, compared to three other cultivars. Analysis of root surface chemistry showed a tentatively identified triterpenol acetate in Centennial, which was not found in the more resistant cultivars; another root surface component was found in higher concentrations in the more resistant cultivars. |
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| Keywords: | Sweet potato weevil Cylas formicarius elegantulus Coleoptera Curculionidae Ipomoea batatas feeding oviposition host-plant preference host-plant resistance root surface chemistry |
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