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Anthony M. Ortiz, Brent S. Sipes, Susan C. Miyasaka, and Alton S. Arakaki

( Colocasia esculenta ) when grown under upland conditions (i.e., non-flooded) can be infected by the root-knot nematode ( Meloidogyne javanica ), resulting in substantial reductions in yields ( Sipes et al., 1995 ). Little naturally occurring resistance to M

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Francesco Di Gioia, Monica Ozores-Hampton, Jason Hong, Nancy Kokalis-Burelle, Joseph Albano, Xin Zhao, Zack Black, Zhifeng Gao, Chris Wilson, John Thomas, Kelly Moore, Marilyn Swisher, Haichao Guo, and Erin N. Rosskopf

a Spodosol classified as Immokalee fine sand (sandy, siliceous, hyperthermic Arenic Haplaquods), and the experimental field was previously characterized as having moderate weed and root-knot nematode pressure. In Immokalee, weed species homogeneously

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Xin Zhao, Qianru Liu, M. Tatiana Sanchez, and Nicholas S. Dufault

including nematodes (e.g., root-knot, Meloidogyne ), fungi (e.g., Verticillium , Fusarium , Pyrenochaeta , and Monosporascus ), oomycetes (e.g., Phytophthora ), bacteria (e.g., Ralstonia ), and several soil-borne viral pathogens ( Louws et al., 2010

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Wenjing Guan, Xin Zhao, Richard Hassell, and Judy Thies

prevention of bacteria from invading xylem tissues ( Grimault and Prior, 1994 ). Root-knot nematodes. Root galling of susceptible plants is a typical response to root-knot nematode (RKN; Meloidogyne spp.) infection, resulting in poor absorption of water and

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Hetal M. Kalariya, Guido Schnabel, Cesar Petri, and Ralph Scorza

≈$157 billion worldwide annually ( Abad et al., 2008 ). Among the most devastating nematodes are Meloidogyne species. Members of this genus cause root knot disease and have a host range of more than 2000 plant species ( Lamberti, 1979 ; Sasser, 1977

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

root-knot nematode (RKN) host assay root and shoot production and reproductive factor (RF) values of various biofumigant crops. Root and shoot biomass of broccoli were greater than comparable biomass of mustards in the RKN host assay, but no conclusions

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Alexis K. Nagel, Hetal Kalariya, and Guido Schnabel

reduced symptom severity when challenged with the stramenopile pathogen Phytophthora cinnamomi and both lines trended toward increased tolerance to the root-knot nematode Meloidogyne incognita ( Nagel et al., 2008 ). The presence of foreign gene

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K.S. Lewers, W.W. Turechek, S.C. Hokanson, J.L. Maas, J.F. Hancock, S. Serçe, and B.J. Smith

common foliar diseases, resistance to black root rot (causal organisms unknown) ( Hancock et al., 2001b , 2002 ), and resistance to northern root-knot nematode ( Meloidogyne hapla ) and root-lesion nematode ( Pratylenchus penetrans ) ( Pinkerton and Finn

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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

per plant. The resistance of ‘Covington’ to southern root-knot nematode race 3 has been independently confirmed by Dr. Judy Thies, USDA-ARS Research Plant Pathologist, U.S. Vegetable Laboratory, Charleston, SC (personal correspondence). ‘Covington

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R.L. Fery and P.D. Dukes

The USDA has released a new cream-type southernpea [Vigna unguiculata (L.) Walp.] cultivar that is well adapted for productionthroughout the southern United States. The new cultivar, named `Tender Cream', is the product of a backcross breeding procedure to transfer the dominant Rk gene for root-knot nematode resistance from `Floricream' into `Carolina Cream'. `Tender Cream' is resistant to cowpea curculio, root-knot nematodes, southern bean mosaic virus, cercospora leaf spot, southern blight, rust, and powdery mildew. `Tender Cream' outyielded the cream control in the 1992, 1993, and 1994 Regional Southernpea Cooperative Trials by 5.4%, 11.0%, and 18.8%, respectively. It outyielded its root-knot-nematode-susceptible `Carolina Cream' isoline by 22.3% in a replicated 1994 test conducted in a field infested with a natural population of the southern root-knot nematode. Canned samples of fresh `Tender Cream' peas scored well during 3 years of testing at the Univ. of Arkansas.