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| Registros recuperados: 11 | |
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| Bordin,Luiz Carlos; Casa,Ricardo Trezi; Marcuzzo,Leandro Luiz; Reis,Erlei Melo; Gheller,André; Zancan,Rômulo Luís; Fingstag,Maiquiel Diego. |
| ABSTRACT: The occurrence of leaf spots in irrigated rice can reduce the yield and compromise the quality of the grain. However it is unknown the economic damage threshold (EDT) that these spots cause the yield of crop. The objective of this study was to obtain damage functions for models of critical, to relate damage by simultaneous occurrence of blast, brown spot and scald spot with grain yield harvests in 2011/12 and 2012/2013, in Rio do Oeste, Santa Catarina State, Brazil. Gradient of diseases intensity was generated by number of applications and fungicides rates. Design was a randomized block with four replications and six treatments consisting of mixing fungicide applications of triazole (difenoconazole) and strobilurin (azoxystrobin). In 2011/12 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Pyricularia oryzae; Bipolaris oryzae; Gerlachia oryzae; Damage. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000100007 |
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| Sandhu,S.S.; Colombo,Carlos; Bastos,Cândido R.; Siqueira,Walter J.. |
| Rice blast is the most important fungal disease of rice and is caused by Pyricularia oryzae Sacc. (Telomorph Magnoporthe grisea Barr.). Seven randomly amplified polymorphic DNA (RAPD) markers OPA5, OPG17, OPG18, OPG19, OPF9, OPF17 and OPF19 showed very clear polymorphism in resistant cultivar lines which differed from susceptible lines. By comparing different susceptible lines, nine DNA amplifications of seven primers (OPA5(1000), OPA5(1200,) OPG17(700), OPG18(850), OPG19(500), OPG19(600), OPF9(600), OPF17(1200) and OPF19(600)) were identified as dominant markers for the blast resistant gene in resistant cultivar lines. These loci facilitate the indirect scoring of blast resistant and blast susceptible genotypes. The codomine RAPDs markers will facilitate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rice; SCAR; Arbitrary primers; Pyricularia oryzae. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400011 |
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| CARDOSO, J. E.; CAMPOS, I. S.. |
| Foi feito um levantamento fitopatológico na cultura do arroz nos municípios de Rio Branco, Brasiléia, Xapuri e Senador Guiomard - gue representam parte da microrregião Alto Purus-AC -, visando identificar e avaliar a ocorrência das doenças da orizicultura. A brusone (Pyricularia oryzae), escaldadura (Rhynchosporium oryzaei, mancha-curvularia (C lunata), mancha-estreita (Cercospora oryzae), mancha-parda (Helminthosporium oryzae) e falso-carvão (Ustilaginoidea virens) foram as mais prevalentes pela ordem decrescente de intensidade. É apresentada uma descrição dos sintomas, da ocorrência e de medidas de controle destas enfermidades. Nenhuma doença de causa bacteriana ou nematológica foi observada. |
| Tipo: Circular Técnica (INFOTECA-E) |
Palavras-chave: Mancha curvularia; Mancha estreita; Alto Purus (AC); Rio Branco (AC); Brasileía (AC); Xapuri (AC); Senador Guiomard (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Enfermedades y desórdenes de las plantas.; Orizicultura; Arroz; Doença de planta; Fungo; Brusone; Pyricularia oryzae; Escaldadura; Rhynchosporium oryzae; Mancha do grão; Curvularia lunata; Cercosporiose; Cercospora oryzae; Mancha parda; Helmintosporiose; Helminthosporium oryzae; Falso carvão; Ustilaginoidea virens; Plant diseases and disorders; Rice.. |
| Ano: 1980 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/492273 |
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| Cacique,Isaias Severino; Domiciano,Gisele Pereira; Moreira,Wiler Ribas; Rodrigues,Fabrício Ávila; Cruz,Maria Fernanda Antunes; Serra,Núria Sierras; Català,Ana Botta. |
| Blast, caused by Pyricularia oryzae, is the most important fungal disease of rice worldwide. This study aimed to compare root and foliar supply of soluble silicon (Si) on rice resistance to blast. The application of soluble Si to the roots increased Si concentration in leaf tissues as compare to plants grown in soil amended with calcium silicate. There was no increase in leaf Si concentration after soluble Si spray, regardless if the leaves were washed or not before analysis. X-ray microanalysis revealed that Si deposition was very similar on the leaf epidermis of plants sprayed with soluble Si, root amended with soluble Si or grown in soil amended with calcium silicate. The lesion size, the number of lesions per cm² of leaf and the area under blast... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pyricularia oryzae; Foliar disease; Mineral nutrition. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052013000300013 |
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| Silva,Washington Luís da; Cruz,Maria Fernanda Antunes; Fortunato,Alessandro Antônio; Rodrigues,Fabrício Ávila. |
| Blast, caused by Pyricularia oryzae, has become a significant disease threat to wheat (Triticum aestivum L.) in Brazil. This study aimed to investigate at the histochemical level if silicon (Si) could enhance the production of flavonoids in the leaves of wheat plants in response to P. oryzae infection. Plants from the Aliança cultivar, which are susceptible to blast, were grown in hydroponic cultures containing 0 (-Si) or 2 mM of Si (+Si) and inoculated by spraying a conidial suspension of P. oryzae (1 × 105 conidia mL−1) on all adaxial leaf surfaces of plants at 60 days after emergence (growth stage 65). The fourth and fifth leaves of each plant were used to evaluate blast severity at 24, 36, 48, 72 and 96 h after inoculation (hai). At 96 hai, leaves were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pyricularia oryzae; Flavonoids; Histochemistry; Phenolics. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400322 |
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| Oliveira,Lillian Matias de; Marchesan,Enio; David,Ricardo de; Werle,Isabel Schlegel; Aramburu,Bruno Behenck; Donato,Gabriel; Silva,Anelise Lencina da; Costa,Ivan Francisco Dressler da. |
| Abstract: The objective of this work was to evaluate the effects of fertilization with nitrogen topdressing and silicates, as well as of the use of fungicides, on the occurrence of rice blast on panicles, milling yield, and whole grains, vitreous grains, and chalky kernels in a flood-irrigated rice cultivar sensitive to the disease. Two experiments were conducted in a randomized complete block design, in a 4×4×2 factorial arrangement, with four replicates: in experiment 1, four doses of nitrogen × four doses of calcium and magnesium silicate on soil × with and without fungicides; and, in experiment 2, four doses of nitrogen × four doses of potassium silicate applied on leaves x with and without fungicides. At the doses above 60 kg ha-1 nitrogen without... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Pyricularia oryzae; Grain yield; Whole grains. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102505 |
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| Hernández-Rodríguez,Annia; Rives-Rodríguez,Narovis; Acebo-Guerrero,Yanelis; Diaz-de la Osa,Acela; Heydrich-Pérez,Mayra; Divan Baldani,Vera Lucia. |
| Este trabajo tuvo como objetivos abordar las potencialidades de uso de bacterias diazotróficas asociativas en la producción sostenible del cultivo del arroz (Oryza sativa L.), tratando temas como la fertilización nitrogenada y su relación con la incidencia en la piriculariosis, añublo o quemazón, así como sus perspectivas de uso en la promoción del crecimiento y control de Pyricularia oryzae Sacc. Al aplicar bacterias diazotróficas asociativas se logran aportes de nitrógeno atmosférico a la planta que permiten disminuir el uso de productos químicos nitrogenados y con ello limitar el crecimiento de P. oryzae. Estas bacterias, además, liberan metabolitos en la rizosfera que disminuyen la concentración de la plaga y la severidad de la enfermedad, lo que trae... |
| Tipo: Journal article |
Palavras-chave: Bacterias diazotróficas; Arroz; Nitrógeno; Pyricularia oryzae. |
| Ano: 2014 |
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1010-27522014000100001 |
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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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| Coelho,Maurício Antônio de Oliveira; Torres,Gisele Abigail Montan; Cecon,Paulo Roberto; Santana,Flávio Martins. |
| Abstract: The objective of this work was to assess the effect of sowing date on the intensity of wheat blast disease, as well as the yield losses caused by this disease in different wheat (Triticum aestivum) genotypes. The experiments were conducted in 2013 at the Sertãozinho experimental station of Empresa de Pesquisa Agropecuária de Minas Gerais (Epamig), in the municipality of Patos de Minas, in the state of Minas Gerais, Brazil. Fourteen wheat genotypes and two sowing dates were evaluated. The experimental design was a randomized complete block with three replicates. The evaluated variables were: incidence, severity, thousand grain weight (TGW), grain yield, and yield losses. A disease index (DI) was calculated, based both on the incidence and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Magnaporthe oryzae; Pyricularia oryzae; Triticum aestivum; Disease index; Severity; Tolerance.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000500631 |
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| Registros recuperados: 11 | |
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