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Registros recuperados: 8
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A Semi-Selective agar medium to detect the presence of Xanthomonas axonopodis pv. malvacearum in naturally infected cotton seed Trop. Plant Pathol.
Mehta,Yeshwant R; Bomfeti,Cleide; Bolognini,Viviani.
A semi-selective agar medium was developed for detection of Xanthomonas axonopodis pv. malvacearum (Xam) in cotton (Gossypium hirsutum) seed. The basic medium was peptone-sucrose-agar (PSA). Criteria for the semi-selective medium were the typical colony characters of Xam and its pathogenicity on cotton. Several systemic fungicides and antibiotics in different concentrations were tested alone or in combination with others. The final composition of the semi-selective agar medium was established after several attempts in order to inhibit most of the fungal and bacterial saprophytes and favour the development of Xam. It contained PSA + cyclohexamide, cephalexin, pencycuron, triadimenol and tolylfluanid. The bacteria were recovered from naturally infected seeds...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gossypium hirsutum; Black arm of cotton; Angular leaf spot.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000500005
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Anastomosis groups and molecular variation in Pseudocercospora griseola. Repositório Alice
SILVA, K. J. D. e; SOUZA, E. A.; FREIRE, C. N. S.; ISHIKAWA, F. H..
The fungus Pseudocercospora griseola is the causal agent of angular leaf spot, a common bean (Phaseolus vulgaris L.) disease. The successful development of angular leaf spot-resistant cultivars depends on understanding the levels of variability in pathogen populations. P. griseola shows great pathogenic and genetic variation using inoculation on differential bean cultivars and molecular markers. Nevertheless, how this variability develops is not clearly understood. Parasexuality has been presented as a mechanism used by asexual fungi to increase variation. Hyphal fusion is the first step for the parasexual cycle, and it can be considered an additional trait for population studies. The aim of this study was to identify hyphal fusion (anastomosis) among P....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Feijoeiro comum; Ciclo parassexual; Mancha angular; Marcador molecular; Angular leaf spot; Common bean; RAPD markers; Parasexual cycle; Phaeoisariopsis griseola.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1030017
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Antifungal activity and ultrastructural alterations in Pseudocercospora griseola treated with essential oils Ciência e Agrotecnologia
Hoyos,Julián Mauricio Ágredo; Alves,Eduardo; Rozwalka,Luciane Cristina; Souza,Elaine Aparecida de; Zeviani,Walmes Marques.
Pseudocercospora griseola, the etiologic agent of angular leaf spot of common bean (Phaseolus vulgaris), is an important disease in all bean-producing regions worldwide and may cause extremely high yield losses. The control of this disease is made more difficult by the pathogen's genetic variability and the inefficiency of fungicides. In this study, of 26 essential oils tested at different concentrations, 25 demonstrated efficiency in affecting the germination of strains 63-31 and 63-63 of the pathogen, reaching inhibition levels of between 80% and 100%. Cymbopogon citratus and Cymbopogon martinii inhibited conidia germination at all concentrations; Eugenia caryophyllata, Cinnamomum sp., Thymus vulgaris, Matricaria recutita, Cordia verbenacea, Origanum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Angular leaf spot; Transmission electron microscopy; Alternative control of plant disease.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000300002
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Controle genético da reação do feijoeiro ao Phaeoisariopsis griseola. Repositório Alice
MENDONÇA, H. A. de; SANTOS, J. B. dos; RAMALHO, M. A. P..
O objetivo do trabalho foi determinar o controle genético da reação do feijoeiro ao P. griseola, no cruzamento Carioca MG x Pérola.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Angular leaf spot; Frijoles; Enfermedades y desórdenes de las plantas; Enfermedades fungales de las plantas; Ensayos de variedades; Análisis de varianza; Fitomejoramiento; Feijão; Doença de Planta; Phaseolus Vulgaris; Doença Fúngica; Mancha Angular; Isariopsis Griseola; Comportamento de Variedade; Variedade Resistente; Resistência Genética; Controle Genético; Método Estatístico; Melhoramento Genético Vegetal; Beans; Plant diseases and disorders; Fungal diseases of plants; Phaeoisariopsis griseola; Variety trials; Genetic resistance; Analysis of variance; Plant breeding.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/502646
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Identification of Phaeoisariopsis griseola pathotypes from five States in Brazil Trop. Plant Pathol.
SARTORATO,ALOISIO.
Due to the increased importance of angular leaf spot of common bean (Phaseolus vulgaris) in Brazil, monitoring the pathogenic variability of its causal agent (Phaeoisariopsis griseola) is the best strategy for a breeding program aimed at developing resistant genotypes. Fifty one isolates of P. griseola collected in five Brazilian States were tested on a set of 12 international differential cultivars in the greenhouse. When inoculated plants showed symptoms but no sporulation was observed, they were transferred to a moist chamber for approximately 20-24 h. After this period of time, if no sporulation was observed, the plants were considered resistant; otherwise, they were considered susceptible. From the fifty-one tested isolates, seven different pathotypes...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Common bean; Angular leaf spot; Physiologic races; Disease resistance.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000100012
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Pathogenic variability among isolates of Pseudocercospora griseola collected in Minas Gerais State. Repositório Alice
SILVA, K. J. D. e; SOUZA, E. A. de; SARTORATO, A.; FREIRE, C. N. de S..
The objective of this study was to evaluate the pathogenic variability of 48 isolates of P. griseola, collected in Minas Gerais State, Brazil.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Feijão; Phaseolus vulgaris; Pseudocercospora griseola; Minas Gerais; Doença de planta; Fungo; Angular leaf spot; Mancha angular.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/214029
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Quantitative analysis of two important epidemiological features of the common bean: Phaeoisariopsis griseola pathosystem Trop. Plant Pathol.
Willocquet,Laetitia; Allorent,Delphine; Savary,Serge.
This work quantifies two important epidemiological features of the bean (Phaseolus vulgaris)/Phaeoisariopsis griseola pathosystem. The first is the effect of the number of nights of leaf wetness on infection efficiency. Infection efficiency was below 10% when inoculated leaflets were exposed to less than two nights of leaf wetness. Optimum infection efficiencies were obtained after three to four nights of leaf wetness, at about 50%. Further nights of leaf wetness did not increase the infection efficiency. The second feature quantified is the relative rate of leaflet defoliation for varying levels of angular leaf spot severity. It increased with disease severity according to a logarithm-like curve, and a relative rate of 0.23 day-1 was estimated for a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epidemiology; Angular leaf spot; Phaseolus vulgaris; Infection efficiency; Defoliation; Leaf wetness; Monocycle process.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582004000600015
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Yield losses in dry bean (Phaseolus vulgaris L.) caused by angular leaf spot (Isariopsis griseola Sacc.). Repositório Alice
RAVA SEIJAS, C. A.; SARTORATO, A.; CARVALHO, J. R. P. de..
Angular leaf spot, incited by Isariopsis griseola Sacc., has become one of the most important diseases of dry beans in Brazil. In the past, it was considered to be a disease of minor importance due to its low incidence and late appearance in the growing season. However, these facts have changed and angular leaf spot has cause severe yield losses in some bean production areas. This study was conducted during 1981-83 at Centro Nacional de Pesquisa de Arroz e Feijão in order to assess yield losses in dry beans caused by this disease.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Feijão; Phaseolus vulgaris; Angular leaf spot; Isariopsis griseola; Mancha angular da folha..
Ano: 1985 URL: http://www.alice.cnptia.embrapa.br/handle/doc/885705
Registros recuperados: 8
Primeira ... 1 ... Última
 

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