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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

.: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

between 1 and 2 acres. Typically, farmers outsource second generation (G2) sweetpotato slips from certified producers in southern U.S. states, opting to purchase vigorous disease- and virus-free slips as opposed to producing slips themselves. Still, the

ken, Japan. < http://www.globalsciencebooks.info/Online/GSBOnline/images/2012/FVCSB_6(SI1)/FVCSB_6(SI1)57-64o.pdf > Moyer, J.W. Salazar, L.F. 1989 Viruses and viruslike diseases of sweetpotato Plant Dis. 73 451 455 Murashige, T. Skoog, F. 1962 A

. 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

‘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

‘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

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

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

( 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