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

Root-knot nematodes are widespread worldwide and cause significant reductions in the yield and quality of storage roots in sweetpotato ( Clark and Moyer, 1988 ). The worldwide distribution of root-knot nematodes (RKN), Meloidogyne Goeldi species

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Arthur Villordon and Christopher Clark

The southern RKN ( M. incognita ) is a major biotic stress to sweetpotato ( I. batatas ) production in many regions ( Overstreet, 2013 ). In addition to causing reductions in yield in susceptible cultivars, the nematode can diminish the quality of

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Wenjing Guan, Xin Zhao, Donald W. Dickson, Maria L. Mendes and Judy Thies

in the market ( Strang et al., 2007 ). Driven by the consumer preference for healthy and specialty produce, demand for specialty melons has been increasing in recent years ( Guan et al., 2013 ). RKNs are a major limiting factor for melon production in

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Cody L. Smith, Joshua H. Freeman, Nancy Kokalis-Burelle and William P. Wechter

pathogen-resistant rootstock. Currently, cucurbit grafting is most common in European and Asian countries, where intensive land use and inability to rotate crops have resulted in an increase in soil-borne pathogens. Although resistance to both RKN

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Ke Cao, Lirong Wang, Gengrui Zhu, Weichao Fang, Chenwen Chen and Pei Zhao

environments, and pest resistance ( Desmond and Daniele, 2008 ). Three major RKN species, Meloidogyne incognita (MI), M. javanica (MJ), and M. arenaria (MA), are present in most areas with tropical and Mediterranean climates ( Lamberti, 1979 ; Sasser

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Judy A. Thies, Sharon Buckner, Matthew Horry, Richard Hassell and Amnon Levi

worldwide. To reduce soilborne disease pressure, Cucurbita rootstocks have been used for grafted watermelon in Asia and the Mediterranean region ( Yetisir et al., 2003 ). However, these rootstocks are highly susceptible to RKNs ( Thies et al., 2010 ). The

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Charles E. Barrett, Xin Zhao and Robert McSorley

pest and disease pressure. One of the major pest management challenges is RKNs ( Meloidogyne spp.), which thrive in warm weather and moist, sandy soils ( Roberts et al., 2005 ; Sasser, 1980 ). RKNs cause root galls that damage the root system and

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Judy A. Thies, Jennifer J. Ariss, Richard L. Hassell, Sharon Buckner and Amnon Levi

The southern RKN ( Meloidogyne incognita ) is a serious constraint to U.S. watermelon production and can significantly reduce watermelon yields in the southern United States ( Davis, 2007 ; Sumner and Johnson, 1973 ; Thies, 1996 ). Pre

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Rachel E. Rudolph, Carl Sams, Robert Steiner, Stephen H. Thomas, Stephanie Walker and Mark E. Uchanski

crops should also be a non-host for nematodes or able to suppress nematode populations in the field. Southern RKN ( Meloidogyne incognita ), a plant–parasitic nematode, is of great concern to chile pepper growers in southern New Mexico ( Walker et al

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Susan L.F. Meyer, Inga A. Zasada, Shannon M. Rupprecht, Mark J. VanGessel, Cerruti R.R. Hooks, Matthew J. Morra and Kathryne L. Everts

mustard ( Brassica carinata ) at a rate of 2.5 t·ha −1 decreased numbers of columbia RKN ( Meloidogyne chitwoodi ) on potato ( Solanum tuberosum ) and increased tuber yields in field plots ( Henderson et al., 2009 ). When applied to soil in greenhouse