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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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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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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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the most predominant and damaging species on pepper in the southern United States: Meloidogyne incognita , M. javanica , and M. arenaria ( Thies and Fery, 2000 ). Fig. 1. Pedigree of the cherry-type pepper line PA-593 with the N gene for

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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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Meloidogyne enterolobii is one of the most harmful root-knot nematodes ( Kiewnick et al. 2009 ). It was first reported on elephant ear bean trees in Danzhou City, Hainan Province, China, in 1983, and is currently found in various regions of the

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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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( 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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’ 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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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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