Periódicos

URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352

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2014 - 20193

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Autor: search.filters.author.Botelho, Deila Magna dos SantosAssunto: search.filters.subject.Coffea arabica

Resultados da Pesquisa

Agora exibindo 1 - 3 de 3
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    Difference between isolates from brown eye spot and black spot lesions in coffee plants
    (Empresa Brasileira de Pesquisa Agropecuária - Embrapa, 2019) Botelho, Deila Magna dos Santos; Resende, Mário Lucio Vilela de; Rezende, Juliana Costa de; Ribeiro Júnior, Pedro Martins; Andrade, Camila Cristina Lage de; Alves, Eduardo; Amaral, Douglas Carvalho
    The objective of this work was to evaluate the difference between the isolates from two cercospora leaf spot symptoms (brown eye spot and black spot) in relation to conidial morphology, mycelial growth, cercosporin production, and reproduction of symptoms in coffee leaves collected in three municipalities in the state of Minas Gerais, Brazil. There was a difference between the isolates for the studied variables, but without any relation to the type of symptom. The differences found were not associated with the origin of the isolates. The symptoms characterized as black spot were associated with different host conditions during the infection process.
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    Phialomyces macrosporus reduces Cercospora coffeicola survival on symptomatic coffee leaves
    (Editora UFLA, 2019-01) Laborde, Marie Caroline Ferreira; Botelho, Deila Magna dos Santos; Rodríguez, Gabriel Alfonso Alvarez; Resende, Mário Lúcio Vilela de; Queiroz, Marisa Vieira de; Batista, Aline Duarte; Cardoso, Patrícia Gomes; Pascholati, Sérgio Florentino; Gusmão, Luis Fernando Pascholati; Martins, Samuel Júlio; Medeiros, Flávio Henrique Vasconcelos de
    Brown eye spot is among the most important coffee diseases, it is caused by a necrotrophic fungal Cercospora coffeicola. Saprobe fungi have potential in reducing the survival of necrotrophic pathogens and can act through competition of nutrients, mycoparasitism, antibiosis and resistance induction. We have screened saprobe fungi for the ability to reduce C. coffeicola sporulation and viability and determined the possible mechanisms involved in the biocontrol. The selected saprobe fungus, Phialomyces macrosporus, reduced the germination of C. coffeicola conidia by 40%. P. macrosporus produced both volatile and non-volatile compounds that inhibited C. coffeicola growth, sporulation and viability. The production of antimicrobial substances was the main mode of action used by the saprobe fungi. Therefore, P. macrosporus is a promising biological agent for the integrated management of brown eye spot
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    Nova técnica para isolar Cercospora coffeicola Berkeley & Cooke, agente etiológico da cercosporiose do cafeeiro
    (Editora UFLA, 2014-01) Santos, Leandro Alvarenga; Souza, Paulo Estevão de; Pozza, Edson Ampélio; Caldeira, Douglas Massimo; Botelho, Deila Magna dos Santos
    A mancha do olho pardo é uma doença endêmica no Brasil. Poucos são os trabalhos publicados sobre essa doença devido à dificuldade de isolamento e de produção de inóculo do fungo Cercospora coffeicola. Objetivou-se, neste trabalho, divulgar a técnica de isolamento desenvolvida e utilizada na Universidade Federal de Lavras, denominada Técnica da Pipeta. Através dela mais de 70 isolados já foram obtidos para estudos futuros do agente etiológico dessa importante doença.