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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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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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Arthur Villordon and Christopher Clark

( Lawrence et al., 1986 ; Overstreet, 2013 ). Cracks induced by the nematodes can also provide an opportunity for decay organisms to enter the root and cause secondary storage rots. Current management options for Meloidogyne spp. in sweetpotatoes include

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

’ bottle gourd (1114) and ‘Strong Tosa’ squash hybrid (2653) ( Table 1 ). Table 1. Percentage of root system galled and covered with egg masses of Meloidogyne incognita, numbers of M. incognita eggs per gram fresh root, and total fruit yield for ‘Tri

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Jorge Pinochet, Carolina Fernández, María de Carmen Jaizme, and Pedro Tenoury

The effects of the interaction between the vesicular-arbuscular mycorrhizal fungus Glomus intraradices Schenk and Smith and the root-knot nematode Meloidogyne javanica (Treub) Chitwood on growth and nutrition of micropropagated `Grand Naine' banana (Musa AAA) were studied under greenhouse conditions. Inoculation with G. intraradices significantly increased growth of plants in relation to nonmycorrhizal plants and was more effective than P fertilization in promoting plant development. Mycorrhizal colonization did not affect nematode buildup in the roots, although plants with the nematode and mycorrhiza were more galled. Meloidogyne javanica had no effect on the percentage of root colonization in mycorrhiza-inoculated plants. No element deficiency was detected by foliar analysis. All elements were within sufficiency levels for banana with exception of N, which was low. Potassium levels were lower in mycorrhizal plants, while Ca and Mg levels were higher with mycorrhiza than without, with or without the nematode. Early inoculation with G. intraradices appears to favor growth of banana plants by enhancing plant nutrition.

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S. Alan Walters and Todd C. Wehner

Root knot caused by Meloidogyne spp. is an important disease of cucumber. Resistance to M. javanica in cucumber (Cucumis sativus L.) is conferred by the newly discovered mj gene. The objective of this research was to determine whether mj was linked to other genes controlling morphological or disease resistance traits in cucumber. Four inbred lines homozygous for mj (LJ 90430, `Manteo', NCG-198, and NCG-199) were crossed with inbreds (`Coolgreen', M 21, NCG-101, WI 2757, and `Wisconsin SMR 18') to form six families: NCG-101 × LJ 90430, WI 2757 × LJ 90430, NCG-199 × `Wis. SMR 18', NCG-198 × M 21, `Manteo' × M 21, and NCG-198 × `Coolgreen'. F2 progeny were evaluated in all families, and BC1 progeny were evaluated only in the NCG-199 × `Wis. SMR 18' family. Meloidogyne javanica resistance and the 17 other traits controlled by simple genes were evaluated in greenhouse or field tests. None of the 17 genes were linked with mj. Therefore, cucumber breeders interested in nematode resistance should be able to incorporate the trait into lines without having to break linkages with the 17 genes used in this study.

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E. Zamora, P.W. Bosland, and S. Thomas

The resistance of `Carolina Cayenne' (Capsicum annuum L.) to root-knot nematode Meloidogyne incognita (Kofoid & White) Chitwood races 1, 2, 3, and 4 was measured. Egg counts from roots were used to determine the plant's resistance to M. incognita. Few eggs were observed on `Carolina Cayenne' roots, whereas all races of M. incognita produced numerous eggs on the susceptible `NuMex R Naky' roots. The results indicated `Carolina Cayenne' is a source of resistance to all known races of M. incognita.