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Rocheteau Dareus, Antonio Carlos Mota Porto, Mesfin Bogale, Peter DiGennaro, Carlene A. Chase, and Esteban Fernando Rios

analysis ( Muñoz-Amatriaín et al., 2021 ). The mini-core collection has been screened for several traits, including screening for resistance to the RKN Meloidogyne incognita Kofoid and White (Chitwood) (P.A. Roberts, personal communication), and for

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Andrew P. Nyczepir, Janete A. Brito, Don W. Dickson, and Thomas G. Beckman

Root-knot nematodes ( Meloidogyne spp.) are an important pathogen of peach [ Prunus persica (L.) Batsch] in the United States. The three major Meloidogyne spp. [ M. arenaria (Neal) Chitwood, M. incognita (Kofoid & White) Chitwood, and M

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

Though little published data have been collected, it is commonly accepted that damage caused by soil-borne pathogens, such as FON and plant parasitic nematodes ( Meloidogyne spp.), has increased since the phase-out of methyl bromide. The ban on

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

Meloidogyne incognita , and the authors ( Jourand et al., 2004 ) speculated that this effect could be the result of nematicidal alkaloids. Recent literature reviews, however, have shown that effects of green manure crops on plant–parasitic nematodes can range

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

the southern United States and in other semitropical and tropical regions of the world. Meloidogyne incognita , M. javanica , and M. arenaria are the most widespread RKN species in the southeastern United States ( Zitter et al., 1996 ), and all of

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W. R. Maluf, S. M. Azevedo, and V.P. Campos

Heritabilities for resistance to root knot nematodes (Meloidogyne javanica and Meloidogyne incognita races 1, 2, 3, and 4) were studied in a population of 226 sweetpotato clones of diverse origin. For each nematode isolate tested, 128-cell speedling trays were filled with previously inoculated substrate (30000 eggs/1000 mL substrate). Sweetpotato clones suitably tagged and identified were randomly planted in the cells (one plant/cell), with a total of four plants per clone per isolate. Ninety days after inoculation, sweetpotato plants had their roots washed for substrate removal, and treated with 150 mg·L–1 Phloxine B to stain nematode egg masses. The number of egg masses per root was recorded, and plants were accordingly assigned scores from 0 (highly resistant) to 5 (highly susceptible). Broad-sense heritability estimates were 0.87, 0.91, 0.81, 0.95, and 0.93 respectively for resistance to M. javanica and races 1, 2, 3, and 4 of M. incognita. The frequencies of resistant genotypes were higher for M. javanica and lower for M. incognita race 2. Genotypic correlations (rG) among the resistances to the various Meloidogyne isolates utilized were weak, ranging from 0.11 to 0.57, suggesting independent genetic controls. Clones could be selected, however, with high levels of resistance to all nematode isolates tested. (This work was supported by CNPq, CAPES, FAPEMIG, and FAEPE/UFLA.)

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S.M. Schneider, B.D. Hanson, J.S. Gerik, A. Shrestha, T.J. Trout, and S. Gao

alternative fumigants through drip irrigation systems Phytopathology 92 1349 1355 Barker, K.R. 1985 Nematode extraction and bioassays 19 35 Barker K.R. Carter C.C. Sasser J.N. An advanced treatise on Meloidogyne volume II: Methodology North Carolina State

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Richard L. Fery and Judy A. Thies

dominant gene conditioning a high level of resistance to the southern root-knot nematode [ Meloidogyne incognita (Chitwood) Kofoid and White], the peanut root-knot nematode [ M. arenaria (Neal) Chitwood], and the tropical root-knot nematode [ M. javanica

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Richard L. Fery and Judy A. Thies

level of resistance to the southern root-knot nematode [ Meloidogyne incognita (Chitwood) Kofoid and White], the peanut root-knot nematode [ M. arenaria (Neal) Chitwood], and the tropical root-knot nematode [ M. javanica (Treub) Chitwood]. Root

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Richard L. Fery and Judy A. Thies

dominant N gene conditions a high level of resistance to the southern root-knot nematode [ Meloidogyne incognita (Chitwood) Kofoid and White], the peanut root-knot nematode [ M. arenaria (Neal) Chitwood], and the tropical root-knot nematode [ M