Consulta: subjectFacets:"Bipolaris oryzae"
Registros recuperados: 17
Data/hora: 09/06/2024 09:40:39

Controle químico de doenças foliares na cultura do arroz irrigado
Provedor de dados: 86
Autores: Celmer,Alisson; Madalosso,Marcelo Gripa; Debortoli,Mônica Paula; Navarini,Lucas; Balardin,Ricardo Silveiro.
O objetivo deste trabalho foi avaliar a interferência das doenças foliares na produtividade de duas cultivares de arroz irrigado, bem como determinar a interação entre ingredientes ativos e momento de aplicação, para o controle de escaldadura e mancha-marrom. Foram utilizados: tiofanato metílico, tebuconazole, azoxystrobin e trifloxystrobin + propiconazole, aplicados em cinco épocas, às cultivares IRGA 417 e El Passo L 144. Os parâmetros avaliados foram: severidade das doenças e rendimento de grãos. O controle químico proporcionou redução significativa na severidade das doenças, em ambas as cultivares, com reflexo no rendimento de grãos, e foi influenciado pelo produto e pela época de aplicação.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Oryza sativa; Bipolaris oryzae; Monographella albescens; Fungicidas; Época de aplicação; Produtividade.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000600019

Aplicação do silício para aumentar a resistência do arroz à mancha-parda
Provedor de dados: 86
Autores: Zanão Júnior,Luiz Antônio; Fontes,Renildes Lúcio Ferreira; Ávila,Vinícius Tavares de.
O objetivo deste trabalho foi avaliar fontes e métodos de aplicação de silício para aumentar sua absorção e a resistência de plantas de arroz (Oryza sativa), cultivar Metica-1, à mancha-parda (Bipolaris oryzae). Foram conduzidos dois experimentos em casa de vegetação, com solo Latossolo Vermelho. O delineamento experimental foi o completamente casualizado, com oito repetições. As fontes foram wollastonita (silicato de cálcio), aplicada via solo, e silicato de potássio e ácido monossilícico, aplicados via foliar. A aplicação de silício via solo resultou em aumento do teor foliar deste elemento e foi eficiente na indução de resistência à mancha-parda, diferentemente do observado com sua aplicação via foliar.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bipolaris oryzae; Oryza sativa; Aplicação foliar; Controle alternativo de doenças; Parcelamento; Severidade.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000200013

Expansion of the biocontrol spectrum of foliar diseases in rice with combinations of rhizobacteria
Provedor de dados: 124
Autores: Souza Júnior,Ismail Teodoro de; Schafer,Jaqueline Tavares; Corrêa,Bianca Obes; Funck,Gustavo Daltrozo; Moura,Andréa Bittencourt.
ABSTRACT The cultivation of irrigated rice is subject to the occurrence of various diseases, where damage causes losses in productivity. Alternatives are currently being sought to control these diseases, with biocontrol a viable possibility. With the aim of broadening the spectrum of action of biocontrol, this study evaluated the effect of combinations of biocontrol bacteria on rice blast (Pyricularia grisea), brown spot (Bipolaris oryzae) and leaf scald (Gerlachia oryzae) in rice plants. The effect of isolate combinations was assessed by microbiolization of seeds from the rice cultivar El Paso L144 with suspensions of the bacteria DFs185 (Pseudomonas synxantha), DFs223 (P. fluorescens), DFs306 (unidentified), DFs416 and DFs418 (Bacillus sp.), used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Pyricularia grisea; Bipolaris oryzae; Gerlachia oryzae; Seed microbiolization.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000300513

ACTIVIDAD ANTIFÚNGICA in vitro DE LAS QUITOSANAS k1 y SIGMA FRENTE A Bipolaris oryzae (B. de Haan) Shoem.
Provedor de dados: 100
Autores: Deyanira,Rivero; Cruz,A; Martínez,B; Rodríguez,Aida T; Ramírez,MA.
Con el objetivo de determinar la actividad antifúngica de la quitosana sobre Bipolaris oryzae, patógeno de mayor incidencia en el síndrome del manchado del grano de arroz y agente causal de la enfermedad de la mancha parda de la hoja, se estudió el efecto in vitro de diferentes concentraciones (300, 500, 700 y 1000 mg/L) de las quitosanas K1 (INCA) y SIGMA sobre el crecimiento micelial del hongo. Para ello se midió el diámetro de las colonias a los 3, 4, 5, 6 y 7 días, y se calculó el porcentaje de inhibición del crecimiento del hongo, con respecto al control no tratado. Para los tratamientos que mostraron total inhibición se determinó el efecto fungicida. Los resultados indicaron que ambos productos tienen un efecto inhibidor del crecimiento del hongo a...
Tipo: Journal article
Palavras-chave: Quitosana; Bipolaris oryzae; Actividad antifúngica.
Ano: 2008
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1010-27522008000100008

Actividad antagónica in vitro de Tsukamurella paurometabola C-924 frente a fitopatógenos
Provedor de dados: 100
Autores: Marín,Marieta; Wong,Idania; García,Graciela; Morán,Rolando; Basulto,Rosa; Pimentel,Eulogio; Mena,Jesús.
El objetivo de este trabajo fue determinar las potencialidades de Tsukamurella paurometabola cepa C-924 como agente de control biológico de hongos fitopatógenos. Se evaluó el efecto de la bacteria sobre siete especies de hongos fitopatógenos a través de ensayos in vitro utilizando los medios Agar Triptona Soya (ATS) y Agar Papa Dextrosa (PDA). La actividad antagónica se determinó cada 24 horas midiendo el diámetro de las colonias de los hongos en presencia de la bacteria, determinando posteriormente los porcentajes de inhibición del crecimiento micelial con relación al control. Se evidenció que T. paurometabola C-924 tuvo actividad antagónica en ambos medios. Los mayores valores de inhibición se produjeron en el medio ATS, sobre Alternaria longipes (Ellis...
Tipo: Journal article
Palavras-chave: Alternaria longipes; Bipolaris oryzae; Colletotrichum gloeosporioides; Fusarium oxysporum f. sp. cubense; Pestalotia palmarum; Thielaviopsis paradoxa; Pythium debaryanum; Antagonismo.
Ano: 2013
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1010-27522013000200006

Efecto de cuatro aceites esenciales sobre hongos asociados al manchado del arroz
Provedor de dados: 100
Autores: Duarte,Yanisia; Pino,Oriela; Martínez,Benedicto.
Este trabajo tuvo como objetivo determinar la actividad antifúngica in vitro de cuatro aceites esenciales sobre tres patógenos causantes del manchado del grano en arroz (Curvularia lunata (Wakker) Boedijn, Sarocladium oryzae (Sawada) W. Gams &amp;amp; D. Hawksworth y Bipolaris oryzae (Breda de Haan) Shoemaker). El bioensayo se realizó según un diseño completamente aleatorizado, se utilizó el método de discos de papel de filtro inoculados con los aceites, colocados en contacto directo con los discos de los hongos fitopatógenos. Se evaluó el crecimiento radial de los hongos diariamente hasta las 96 horas. Los aceite de Piper auritum Kunth (caisimón de anís) y Piper aduncum subsp. ossanum (C. DC.) Saralegui (platanillo de Cuba) produjeron inhibición total del...
Tipo: Journal article
Palavras-chave: Manchado del grano; Arroz; Oryza sativa; Actividad antifúngica; Curvularia lunata; Sarocladium oryzae; Bipolaris oryzae.
Ano: 2014
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1010-27522014000100008

EVALUACIÓN DE LA EFECTIVIDAD DE DOCE CEPAS DE Trichoderma asperellum Samuels SOBRE TRES FITOPATÓGENOS EN CONDICIONES DE CAMPO
Provedor de dados: 100
Autores: Infante,Danay; González,Noyma; Reyes,Yusimy; Martínez,B.
La incidencia de las enfermedades en plantas causadas por agentes fungosos se incrementa cada año a nivel mundial, lo que ha hecho necesario la búsqueda e introducción de nuevas alternativas para su control. Entre los microorganismos más ampliamente utilizados como agente de control biológico de enfermedades fungosas se encuentran aislamientos del género Trichoderma, por las bondades y mecanismos de acción que poseen (competencia por el sustrato, antibiosis y micoparasitismo). Este trabajo tuvo como objetivo evaluar la eficacia de 12 cepas de Trichoderma asperellum Samuels frente a tres fitopatógenos, inoculados artificialmente en condiciones de campo. La efectividad de las cepas de T. asperellum se evaluó sobre Bipolaris oryzae (Breda de Haan) Shoemaker,...
Tipo: Journal article
Palavras-chave: Trichoderma asperellum; Bipolaris oryzae; Curvularia lunata; Fusarium oxysporum f. sp. lycopersici; Eficacia.
Ano: 2011
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1010-27522011000300010

การต้านทานสารเคมี propiconazole ของเชื้อรา Bipolaris oryzae สาเหตุโรคใบจุดสีน้ำตาลในพื้นที่เขตภาคกลาง
Provedor de dados: 106
Autores: Sith Jaisong; Rasamee Dhitikiattipong; Witchuda Rattanakarn; Wanporn Khemmuk; Kanuengnij Srivilai.
Tipo: PhysicalObject
Palavras-chave: Bipolaris oryzae; Fungicide resistance; Rice brown spot; Propiconazole; Rice; Bipolaris oryzae; การต้านทานสารเคมี; โรคใบจุดสีน้ำตาล; Propiconazole.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5436

ความไวต่อสารเคมี Propiconazole ของเชื้อรา Bipolaris oryzae สาเหตุโรคใบจุดสีน้ำตาลในพื้นที่นาภาคกลาง
Provedor de dados: 106
Autores: Sith Jaisong; Rasamee Dthikiattipong; Witchuda Rattanakarn; Wanporn Kemmuk; Kanungnid Sriwilai.
Fungicides are important tool for managing diseases in many crops. For example, managing Brown spot of rice relies on the application of fungicides. The heavy use of fungicides has triggered to the development of isolates of Bipolaris oryzae (Helminthosporium oryzae) resistant to fungicides. This survey, the farmers randomly were interviewed about fungicide application, showed that most of farmers (76%) used triazole fungicide. 18, 16, 8 and 8 % used dithiocarbamat, triazolobenzo strobirulin and benzimidazole repectively. In vitro fungicide sensitivity assays using poison media technique expressed propiconazole and haxaconazole at concentration 10 ppm inhibit completely mycelium growth. This study was undertaked for evaluating the prevalence of fungicide...
Tipo: PhysicalObject
Palavras-chave: Bipolaris oryzae; Helminthosporium oryzae; Fungicide resistance; Brown spot; Propiconazole; Triazole; Rice; เชื้อรา; ความต้านทานสารเคมีกำจัดเชื้อรา; โรคใบจุดสีน้ำตาล; โพรพิโคนาโซล; ประสิทธิภาพการควบคุมโรค.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5710

ความไวต่อสารป้องกันกำจัดเชื้อรา propiconazole ของ Bipolaris oryzae สาเหตุโรคใบจุดสีน้ำตาลของข้าว ในพื้นที่นาภาคกลาง
Provedor de dados: 106
Autores: Sith Jaisong; Rasamee Dhitikiattipong; Witchuda Rattanakarn; Wanporn Khemmuk; Kanuengnij Srivilai.
Fungicides are important tool for managing diseases in many crops. For example, managing brown spot of rice relies on the application of fungicides. The heavy use of fungicides has triggered to the development of isolates of Bipolaris oryzae (Helminthosporium oryzae) resistant to fungicides. This survey, the farmers were randomly interviewed about fungicide application, showed that most of farmers (76%) used triazole fungicide. 18, 16, 8 and 8 % used dithiocarbamat, triazolobenzo strobirulin and benzimidazole respectively. In vitro fungicide sensitivity assays using poison media technique expressed propiconazole and haxaconazole at concentration 10 ppm inhibit completely mycelium growth. This study was undertaked for evaluating the prevalence of fungicide...
Tipo: PhysicalObject
Palavras-chave: Bipolaris oryzae; Fungicide resistance; Rice brown spot disease; Propiconazole; Rice disease; ข้าว; โรคใบจุดสีน้ำตาลของข้าว; โพรพิโคนาโซล; โรคข้าว; ความต้านทานสารป้องกันกำจัดเชื้อรา.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5525

Genetic variation among pathogens causing "Helminthosporium" diseases of rice, maize and wheat
Provedor de dados: 102
Autores: WEIKERT-OLIVEIRA,RITA C. B.; RESENDE,M. APARECIDA DE; VALÉRIO,HENRIQUE M.; CALIGIORNE,RACHEL B.; PAIVA,EDILSON.
Twenty isolates of four fungal species, agents of "Helminthosporium" diseases in cereals, were collected from different regions: nine Bipolarisoryzae isolated from rice (Oryza sativa), seven B.sorokiniana from wheat (Triticum aestivum), two B. maydis, and two Exserohilumturcicum from maize (Zea mays). The strains were compared by PCR-RFLP and RAPD analysis. Size polymorphism among the isolates in the ITS region comprising the 5.8 S rDNA indicated genetic differences among the isolates, while a UPGMA phenogram constructed after the digestion of this region with restriction enzymes showed inter- and intra-specific polymorphism. The RAPD profiles indicated an expressive level of polymorphism among different species, compared with a low level of polymorphism...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bipolaris sorokiniana; Bipolaris oryzae; Bipolaris maydis; Exserohilum turcicum; PCR-RFLP; RAPD.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000600015

Effect of silicon sources on rice diseases and yield in the State of Tocantins, Brazil - doi: 10.4025/actasciagron.v33i3.6573
Provedor de dados: 1
Autores: Santos, Gil Rodrigues dos; Universidade Federal do Tocantins.; Castro Neto, Manoel Delintro de; Universidade Federal do Tocantins; Ramos, Leandro Nogueira; Universidade de Brasília; Sarmento, Renato Almeida; Universidade Federal do Tocantins; Korndörfer, Gaspar Henrique; Universidade Federal de Uberlândia; Ignácio, Maíra; Universidade Federal do Tocantins.
The intensity of rice diseases in regions with poor levels of silicates (Si) in the soil, together with high control costs, can make the cultivation of rice unfeasible. Surprisingly, there are scarce research data available regarding the influence of Si on rice diseases in tropical lowland regions. Therefore, the aim of this study is to determine the effect of three silicon sources on rice yield and disease management. Three experiments were carried out from December 2005 to April 2006 at an experimental field area located in Formoso do Araguaia, Tocantins state, Brazil. Each experiment consisted of one silicon source (powder, granular or liquid) and the treatments consisted of six Si doses. All the treatments were performed in a completely randomized...
Tipo: Pesquisa Empírica de Campo
Palavras-chave: 5.01.02.00-1 Oryza sativa; Bipolaris oryzae; Magnaporthe oryzae; Silicate Fitossanidade Oryza sativa; Bipolaris oryzae; Magnaporthe oryzae; Silicate.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6573

Influência do magnésio na resistência do arroz à mancha parda
Provedor de dados: 53
Autores: Moreira,Wiler Ribas; Resende,Renata Sousa; Rodrigues,Fabrício Ávila; Andrade,Camila Cristina Lage; Nascimento,Clístenes Williams Araujo.
A mancha parda, causada pelo fungo Bipolaris oryzae, é uma das principais doenças da cultura do arroz. Sabe-se que o magnésio (Mg) tem o potencial de reduzir a intensidade de algumas doenças em culturas de importância econômica e, portanto, o objetivo desse trabalho foi verificar o efeito de diferentes doses desse macronutriente na resistência do arroz à mancha parda. Para isto, plantas de arroz (cv. Metica-1) foram cultivadas em solução nutritiva contendo 0,25; 0,5; 1; 2 e 4 mmol.L-1 de Mg. Foram avaliados o período de incubação (PI), o número de lesões (NL) por cm² de folha, a severidade da mancha parda e a concentração foliar de Mg. Os dados de severidade foram usados para calcular a área abaixo da curva do progresso da mancha parda (AACPMP). Outro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bipolaris oryzae; Enzimas de defesa; Nutrição mineral.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052013000200007

Silicon, acibenzolar-S-methyl and potassium phosphite in the control of brown spot in rice
Provedor de dados: 53
Autores: Nascimento,Kelly Juliane Telles; Araujo,Leonardo; Resende,Renata Sousa; Schurt,Daniel Augusto; Silva,Washington Luís da; Rodrigues,Fabrício de Ávila.
ABSTRACT This study investigated the effects of silicon (Si), acibenzolar-S-methyl (ASM), and potassium phosphite (Phi) on the potentiation of rice resistance to infection by Bipolaris oryzae. The treatments included the soil amended with Si (1.25 g of calcium silicate per kg of soil), spraying of plants with ASM (500 mg∙L–1), Phi (5 mL∙L–1), and distilled water (control) 24 h before inoculation with B. oryzae. The treatments Si supply and the spraying of ASM and Phi were effective in reducing the area under brown spot progress curve and the number of lesions per cm2 of leaf. Polyphenoloxidases activity was higher for plants supplied with Si. On plants sprayed with ASM, the activities of polyphenoloxidases, phenylalanine ammonia-lyases, chitinases, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bipolaris oryzae; Oryza sativa; Host defense responses; Induction of resistance; Phenylpropanoids; PR-proteins.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000200212

Control of brown spot pathogen of rice (Bipolaris oryzae) using some phenolic antioxidants
Provedor de dados: 58
Autores: Shabana,Y.M.; Abdel-Fattah,G.M.; Ismail,A.E.; Rashad,Y.M.
Bipolaris oryzae is the causal agent of rice brown spot disease and is responsible for significant economic losses. In order to control this disease, three phenolic antioxidants were tested (salicylic acid, benzoic acid and hydroquinone). The antifungal activity of the tested substances were investigated against B. oryzae at different concentrations in vitro, as well as the efficacy of their exogenous application in controlling rice brown spot disease under field conditions. In vitro, benzoic acid or salicylic acid at 9 mM completely inhibited the growth of B. oryzae. Under field conditions, spraying of benzoic acid at 20 mM led to a significant reduction in disease severity (DS) and disease incidence (DI) on the plant leaves, in addition to a significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benzoic acid; Bipolaris oryzae; Hydroquinone; Salicylic acid; Systemic resistance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000300006

Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease
Provedor de dados: 65
Autores: 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

Escala diagramática para avaliação de severidade de mancha-parda em arroz
Provedor de dados: 65
Autores: Lenz,Giuvan; Balardin,Ricardo Silveiro; Corte,Gerson Dalla; Marques,Leandro Nascimento; Debona,Daniel.
Uma escala diagramática com seis níveis: 1,6; 3,2; 6,4; 12,6; 23,1 e 38,6% foi desenvolvida e validada para quantificar a severidade da mancha-parda em arroz causada por Bipolaris oryzae. A escala considerou o limite de severidade máxima da doença observado no campo, e os níveis intermediários seguiram incrementos logarítmicos, obedecendo-se à "Lei do estímulo de Weber-Fechner". Inicialmente, a estimativa da severidade foi realizada sem auxílio da escala, em 30 folhas com diferentes níveis de severidade, por oito indivíduos, sem experiência na avaliação de doenças. Em seguida, os mesmos avaliadores utilizaram a escala diagramática proposta. As avaliações com a escala diagramática foram mais precisas e acuradas nas estimativas de todos os avaliadores, não...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bipolaris oryzae; Drechslera oryzae; Diagnose; Mancha foliar; Fitopatometria.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000400002