Reprodução De Meloidogyne Incognita Raça 2 Em Diferentes Cultivares De Alface (Lactuca Sativa L.)

Wilcken, S.R.S.; Garcia, M.J. De M.; Silva, N. da

doi:10.1590/1808-1657v71p3792004

Arq. Inst. Biol.

2004

DOI: 10.1590/1808-1657v71p3792004

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Reprodução De Meloidogyne Incognita Raça 2 Em Diferentes Cultivares De Alface (Lactuca Sativa L.)

S.R.S. Wilcken,

M.J. De M. Garcia,

N. da Silva

Abstract: RESUMO O presente estudo foi realizado visando avaliar a taxa de multiplicação de Meloidogyne incognita raça 2 em 10 cultivares de alface (Lactuca sativa L.). O experimento foi conduzido em condições de casa-de-vegetação, no delineamento inteiramente casualizado, com 10 tratamentos (Gorga, Vitória, Krizet, Lucy Brown, BR 202, BR 48, Vanessa, Monalisa, Elisa e Tinto) e 4 repetições. O tomateiro (Lycopersicon esculentum cv. Rutgers) foi utilizado como testemunha da viabilidade do inóculo. A população inicial de … Show more

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Potential of aqueous extracts of basidiomycetes to control root-knot nematodes on lettuce

et al. 2019

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The root-knot nematode (Meloidogyne incognita) is one of the main pests of lettuce due to the crop’s high susceptibility, unavailability of registered nematicides and lack of resistant cultivars. The aim of this study was to evaluate the potential of aqueous extracts of ten basidiomycete fungi for root-knot nematode control (in vitro and in vivo) on lettuce. The aqueous extracts of these fungi were initially evaluated in vitro in relation to their nematostatic and nematicidal activity. All extracts inhibited the hatching of second-stage juveniles of nematodes. The extracts that provided the highest mortality index (Pleurotus ostreatus, P. citrinopileatus, P. pulmonarius and Boletus sp.) were applied in pots containing autoclaved and infested soil with root-knot nematode. After 24 h, one lettuce seedling (cv. Regina) per pot was transplanted using soil treated with distilled water as control. After 50 days, we observed that soil treated with fungal extracts reduced, approximately, 70% of nematode reproduction. Plants treated with extracts obtained higher fresh mass and extracts of Boletus sp. and P. pulmonarius reduced damages to roots, being considered as potential bio-controllers of this nematode.

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Potential of aqueous extracts of basidiomycetes to control root-knot nematodes on lettuce

et al. 2019

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Characterization of lettuce genotypes for resistance to root-knot nematodes (Meloidogyne spp.)

et al. 2020

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Genetic resistance is the most suitable mechanism to control root-knot nematodes in lettuce. However, information about the resistance levels of currently used lettuce cultivars is scarce in the literature. Thus, the objective of this research was to characterize lettuce cultivars for resistance to root-knot nematodes Meloidogyne incognita (Mi) and M. javanica (Mj), aiming the identification of resistance sources for breeding, and to transfer information to the productive sector. We evaluated 97 lettuce genotypes in tree trials. In the first one (preliminary assessment), 92 lettuce genotypes were inoculated simultaneously with M. incognita race 1 and M. javanica species, 17 days after sowing. The gall index (GI) was evaluated 41 days after inoculation. In the second trial nine genotypes, selected from the first trial, were evaluated; and in the third trial, two new cultivars from Embrapa were evaluated. In the last two trials, the nematode species were inoculated separately, and the egg mass index (EMI), number of eggs per gram of roots (NEGR) and reproduction factor (RF) were also evaluated. In both trials, the lettuce cultivars Salinas 88 and Grand Rapids were used as resistant controls, as well as cultivar Irene as the susceptible control. The data were submitted to analysis of variance and treatments means grouping by Scott-Knott´s test. The crisp leaf cultivars presented a higher degree of resistance to the root-knot nematodes compared to the smooth leaf type cultivars. Cultivars Vera and Amanda present resistance to M. incognita, and Vanda to M. javanica. ‘Salinas 88’ present resistance mainly to M. javanica; while cultivar Mônica and the Embrapa cultivars BRS Leila and BRS Mediterrânea are resistant to both nematode species.

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Reprodução De Meloidogyne Incognita Raça 2 Em Diferentes Cultivares De Alface (Lactuca Sativa L.)

Cited by 2 publications

References 0 publications

Potential of aqueous extracts of basidiomycetes to control root-knot nematodes on lettuce

Potential of aqueous extracts of basidiomycetes to control root-knot nematodes on lettuce

Characterization of lettuce genotypes for resistance to root-knot nematodes (Meloidogyne spp.)

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