Coffee Science - v.14, n.1, 2019

URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/12058

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Assunto: search.filters.subject.Mancha de olho pardo

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    Infection process of Cercospora coffeicola in immature coffee fruits
    (Editora UFLA, 2019-01) Paula, Paulo Victor Augusto Azevedo de; Pozza, Edson Ampélio; Alves, Eduardo; Moreira, Silvino Intra; Paula, Júlio Cesar Azevedo; Santos, Leandro Alvarenga
    Cercosporiosis is caused by Cercospora coffeicola and represents a very important coffee plants phytosanitary problem. Catuaí IAC 144 and Topázio cultivars at the F2 stage were inoculated with a conidial suspension. Samples were collected at 4, 8, 12, 24, 36, 48, 72, 96, and 168 hours after inoculation (hai) for scanning electron microscope studies. Fungal germination in epidermal surface occurred four hai; penetration only through epidermal wounds, without appressoria, started at 12 hai while the mycelial colonization occurred at 72 hai. The infection in immature coffee fruits implies brown eyespot control management anticipation need, even before the first symptoms.
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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