Navegando por Autor "Silveira, Silvaldo Felipe da"

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    Characterization of resistance response of Coffea canephora genotypes to Meloidogyne incognita (Est I2) root-knot nematode
    (Editora UFLA, 2018-04) Santos, Anderson Vieira; Rocha, Rodrigo Barros; Silveira, Silvaldo Felipe da; Teixeira, Alexsandro Lara; Matos, Sara Inácia de; Vieira Júnior, José Roberto
    Meloidogynose is prominent among the factors that limit yield in C. canephora in the western Amazon, Brazil. It is caused by species of “root-knot nematode”; the most important and aggressive of these species for coffee is M. incognita. The aim of this study was to assist the selection of resistant genotypes by characterizing the reaction of 32 C. canephora clones to M. incognita (Est I2). These genotypes are selected plants from the Germplasm Bank of Embrapa Rondônia of the botanical varieties Conilon, Robusta and intervarietal hybrids. The experiments were conducted under greenhouse conditions by inoculating six seedlings for each clone with 10 ml of suspension containing 5000 eggs of a pure inoculum of M. incognita. At 150 days after inoculation, evaluations were made of fresh weight of roots (FWR), total number of galls (NG), total number of eggs (NE), and the nematode reproduction factor (RF=final population/initial population). In contrast with the susceptible controls of arabica coffee (RF=1.2) and tomato plants (RF=31.3), six clones of the Conilon botanical variety, five clones of the Robusta botanical variety and eight intervarietal hybrids reacted as resistant to M. incognita, exhibiting RF<1 and a reduced number of galls (NG mean = <10). The clones identified as resistant in this study were integrated in the coffee breeding program in Rondônia for development of cultivars resistant to the root-knot nematode adapted to tropical conditions.
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    Mancha de mirotécio em mudas de cafeeiro
    (Sociedade Brasileira de Fitopatologia (SBF), 2007-10-01) Silveira, Silvaldo Felipe da; Mussi-Dias, Vicente; Ponte, Elaine Cristina de; Dias, Pedro Paulo
    In an experimental coffee (Coffea arabica) nursery in Campos dos Goytacazes, state of Rio de Janeiro, the occurrence of leaf necrosis, stem canker and girdling was observed, followed by death, in 2 to 5 month-old plants, caused by Myrothecium roridum. This is the first report of this pathogen on coffee plants in Rio de Janeiro state, Brazil.