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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

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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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Zachary N. Hoppenstedt, Jason J. Griffin, Eleni D. Pliakoni, and Cary L. Rivard

propagating slips are routinely importing costly tissue-cultured and virus-tested derived seed stock ( La Bonte et al., 2000 ), production systems that promote high yield and consistency would be ideal for sweetpotato slip production. Nevertheless, the authors

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

‘Burgundy’ sweetpotato [ Ipomoea batatas (L.) Lam.] was developed by the Louisiana Agricultural Experiment Station to provide an orange fleshed, red-skinned cultivar with superior storage root shape, high sucrose content, disease resistance, and

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Jollanda Effendy, Don R. La Bonte, and Niranjan Baisakh

Sweetpotato is a genetically complex clonal crop with incompatibility that presents a bottleneck in backcrossing desirable traits into otherwise superior cultivars. Breeding programs thus rely on open-pollinated, mass selection techniques to improve

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Yuanfu Ji, Jay W. Scott, David J. Schuster, and Douglas P. Maxwell

Tomato-infecting begomoviruses, including monopartite tomato yellow leaf curl virus (TYLCV) and numerous bipartite viruses including tomato mottle virus (ToMoV), are transmitted by the sweetpotato whitefly ( Bemisia tabaci ), the B biotype of

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Danielle D. Treadwell, Nancy G. Creamer, Greg D. Hoyt, and Jonathan R. Schultheis

note that consideration was not given to roots graded unmarketable as a result of insect and disease damage. The incidence of root damage by soil-dwelling insects is a major problem in commercial sweetpotato production areas. Only recently have

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John W. Scott, Samuel F. Hutton, and Joshua H. Freeman

indicates their resistance may be effective against a wide range of Begomoviruses . Table 3. Tomato yellow leaf curl virus (TYLCV) and Tomato mottle virus (ToMoV) disease severity z for tomato genotype inoculated at the seedling stage at the Gulf Coast

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Arthur Villordon, Don LaBonte, and Julio Solis

-based system underestimated NAR, PR, and SR counts relative to the destructive sampling-based total counts. Previous work on quantifying sweetpotato transplant response using destructive sampling-based AR counts included such experimental treatments as virus

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Karen R. Harris, W. Patrick Wechter, and Amnon Levi

viruses, fungi, oomycetes, bacteria, and insects. The most destructive virus diseases in watermelon are caused by papaya ringspot virus, watermelon mosaic virus, and zucchini yellow mosaic virus ( Strange et al., 2002 ). The most devastating fungal and