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| Lombard, L.; Polizzi, G.; Guarnaccia, V.; Vitale, A.; Crous, P.W.. |
| Calonectria spp. are important pathogens of ornamental plants in nurseries, especially in the Northern Hemisphere. They are commonly associated with a wide range of disease symptoms of roots, leaves and shoots. During a recent survey in Tunisia, a number of Calonectria spp. were isolated from tissues of ornamental plants showing symptoms of leaf spot, crown and root rot. The aim of this study was to identify these Calonectria spp. using morphological and DNA sequence comparisons. Two previously undescribed Calonectria spp., C. pseudomexicana sp. nov. and C. tunisiana sp. nov., were recognised. Calonectria mexicana and C. polizzii are newly reported for the African continent. Pathogenicity tests with all four Calonectria spp. showed that they are able to... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Calonectria; Crown and root rot; DNA phylogeny; Leaf spot; Pathogenicity; Systematics. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/531828 |
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| Marques,Eder; Borges,Rafaela CF; Uesugi,Carlos H. |
| ABSTRACT: In 2013, leaf samples of gerbera plants showing symptoms of bacterial blight were collected in cut-flower high tunnels, in the settlement of núcleo rural alexandre gusmão, located in brazlândia, distrito federal, brazil. seven isolates obtained were subjected to phenotypic and molecular characterization, including pathogenicity tests, lopat, and partial sequencing of the 16s rdna gene. all isolates were gram-negative, aerobic, oxidase-positive, produced fluorescent pigment, induced hypersensitivity in tobacco leaves, used sorbitol and glutamate and were pathogenic to 24 different plant species. results of these tests and analysis of the sequences of rdna showed 100% identity with pseudomonas cichorii. to our knowledge, this is the first report of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gerbera jamesonii; Leaf spot; LOPAT.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362016000200244 |
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| COSTA, R. V. da; COTA, L. V.; SILVA, D. D. da; CAMPOS, L. J. M.; ALMEIDA, R. E. M. de; BERNARDES, F. P.; PEREIRA, L. A. O. A.. |
| Com o objetivo de avaliar o efeito de épocas de semeadura e da resistência de híbridos no desenvolvimento da mancha-de-bipolaris-do-milho, foram conduzidos experimentos de campo, semeados em diferentes épocas de semeadura, em fazendas de produção de grãos (soja e milho safrinha) localizadas nos municípios de Pedro Afonso-TO (Fazenda Pedra Azul), Aparecida do Rio Negro-TO (Fazenda Boa Esperança) e Porto Nacional-TO (Fazenda Frigovale). O clima da região, nas três localidades, é caracterizado por chuvas de verão e inverno seco, típico do bioma de Cerrado (Alvares et al., 2013). A temperatura média é de 32 °C na estação seca (abril a setembro) e 26 °C na estação chuvosa (outubro a março). O solo nas três localidades é classificado como Latossolo vermelho... |
| Tipo: Circular Técnica (INFOTECA-E) |
Palavras-chave: Doença foliar; Doença de Planta; Mancha Foliar; Hibrido; Cercosporiose; Mancha Branca; Plant diseases and disorders; Leaf spot; Hybrids. |
| Ano: 2018 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1093117 |
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| Cacique,Isaías Severino; Domiciano,Gisele Pereira; Rodrigues,Fabrício Ávila; Vale,Francisco Xavier Ribeiro do. |
| Blast, caused by the fungus Pyricularia oryzae, is the most important fungal disease of rice. The effect of silicon (Si) and manganese (Mn), and their interaction, on rice resistance to blast was investigated. Rice plants (cultivar "Metica 1") were grown in hydroponic solution with 0 or 2 mmol L-1 of Si and with 0.5, 2.5, and 10 mmol L-1 of Mn. Sixty-day-old plants were inoculated with a conidial suspension of P. oryzae and the incubation period (IP), the number of lesions (NL) per cm² of leaf area, the lesion size (LS), and blast severity were evaluated. Blast severity was scored at 48, 72, 96, and 144 hours after inoculation and data were used to obtain the area under blast progress curve (AUBPC). Silicon concentration was significantly higher in leaf... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Pyricularia oryzae; Leaf spot; Mineral nutrition. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000200013 |
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