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James D. McCreight, Hsing-Yeh Liu and Thomas A. Turini

Sweetpotato whitefly, Bemisia tabaci (Gennadius), adversely affects yield and quality of a wide range of vegetable and agronomic crops worldwide directly through feeding damage or indirectly as virus vectors ( Henneberry et al., 1998 ). It is

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Howard F. Harrison Jr, Trevor R. Mitchell, Joseph K. Peterson, W. Patrick Wechter, George F. Majetich and Maurice E. Snook

.:Fr) Vuill. is one of the most serious postharvest diseases of sweetpotato ( Clark and Moyer, 1988 ). This phytopathogen requires wounds that penetrate the outer layer of the storage root to cause infection. A bioassay that measured R. stolonifer growth

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D. Michael Jackson, Howard F. Harrison, Robert L. Jarret and Phillip A. Wadl

ken, Japan. < > Moyer, J.W. Salazar, L.F. 1989 Viruses and viruslike diseases of sweetpotato Plant Dis. 73 451 455 Murashige, T. Skoog, F. 1962 A

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Jim C. Cervantes-Flores, G. Craig Yencho, Kenneth V. Pecota, Bryon Sosinski and Robert O.M. Mwanga

. 2005a Associating molecular markers with virus resistance to classify sweetpotato genotypes J. Amer. Soc. Hort. Sci. 130 355 359 Mcharo, M. LaBonte, D.R. Clark, C. Hoy, M. Oard, J.H. 2005b

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Don R. La Bonte, Christopher A. Clark, Tara P. Smith and Arthur Q. Villordon

‘Orleans’ sweetpotato [ Ipomoea batatas (L.) Lam.] was developed by the Louisiana Agricultural Experiment Station to provide an orange-fleshed, light rose-skinned cultivar similar to ‘Beauregard’ ( Rolston et al., 1987 ) with superior storage root

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G. Craig Yencho, Kenneth V. Pecota, Jonathan R. Schultheis, Zvezdana-Pesic VanEsbroeck, Gerald J. Holmes, Billy E. Little, Allan C. Thornton and Van-Den Truong

‘Covington’ originated from botanical seed harvested from the sweetpotato clone NC1528 (female parent). NC1528, an NCSU breeding line derived from ‘Regal’ ( Jones et al., 1985 ), was one of 26 genotypes present in the sweetpotato breeding and

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Susan L. Barkley, Sushila Chaudhari, Jonathan R. Schultheis, Katherine M. Jennings, Stephen G. Bullen and David W. Monks

Bryan, A.D. Pesic-VanEsbroeck, Z. Schultheis, J.R. Pecota, K.V. Swallow, W.H. Yencho, G.C. 2003 Cultivar decline in sweetpotato: I. Impact of micropropagation on yield, storage root quality, and virus incidence in ‘Beauregard’ J. Amer. Soc. Hort. Sci

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Monica Ozores-Hampton, Philip A. Stansly and Eugene McAvoy

respectively to examples 1, 2, and 3 + 4 in Lapidot and Friedman (2002). Tomato TYLCV disease severity ratings were not taken in 2008 due to low field virus pressure. Bacterial leaf spot disease severity was rated on a 1-to-5 scale (1 = low and 5 = high) at the

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Yuanfu Ji, John W. Scott and David J. Schuster

( Polston and Anderson, 1997 ). Disease symptoms in tomato ( Solanum lycopersicum , formerly Lycopersicon esculentum ) include leaf curling and yellowing and plant stunting. TYLCV is transmitted by the sweetpotato whitefly, Bemisia tabaci (Genn.), also

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Samuel F. Hutton, Yuanfu Ji and John W. Scott

Begomoviruses vectored by the sweetpotato whitefly ( Bemisia tabaci ) are a major threat to tomato ( Solanum lycopersicum ) production in many regions around the world. Of the many begomoviruses, the strains that cause Tomato yellow leaf curl virus