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| Olguín Hernández, Gildardo. |
| A nivel mundial, México ocupa el primer lugar en producción y exportación de chayote (Sechium edule) tipo verde liso. La principal zona de producción se ubica en la región central de Veracruz, principalmente en los municipios de Coscomatepec, Huatusco, Ixhuatlán del Café, Chocamán, Tlilapan, Orizaba, Rafael Delgado y Amatlán de los Reyes. Como consecuencia del éxito comercial del chayote en los mercados de Norteamérica, la superficie de la producción nacional como monocultivo ha aumentado considerablemente, lo que ha generado la aparición de problemas fitosanitarios, principalmente la marchitez de plantas. Los productores han asociado este síntoma con Phytophthora spp. y aplican para su control fungicidas a base de metalaxyl, lo cual reduce la incidencia... |
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Palavras-chave: Phytophthora spp.; Etiología; Chayote; Metalaxyl; Etiology; Fitopatología; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1973 |
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| Michereff,Sami J; Noronha,Marissônia A; Xavier Filha,Maria S; Câmara,Marcos PS; Reis,Ailton. |
| Brassicaceae family comprises plant species that are very important as vegetable crops, such as the species complex Brassica oleracea and Brassica rapa. Alternaria brassicicola and A. brassicae are among the most important pathogens of Brassicaceae causing Alternaria leaf spot disease. The occurrence and prevalence of Alternaria species causing leaf spots in brassica crops in Pernambuco was acessed, as well as the existence of a possible preference by vegetable host for these pathogens. Twenty-eight fields were surveyed in the Agreste region of Pernambuco state, in the 2005 and 2006 growing seasons. In each year, 10 Chinese cabbage, six cabbage, six cauliflower and six broccoli fields were visited. In each field, 50 leaves showing at least five lesions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea; Brassica rapa; Alternaria brassicae; A. brassicicola; Etiology; Epidemiology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000200027 |
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| Reis,A; Nascimento,WM. |
| This paper reports for the first time in the Cerrado region of Brazil the occurrence of white mold caused by Sclerotinia sclerotiorum in coriander (Coriandum sativum), parsley (Petroselinum crispum) and Peruvian carrot (Arracacia xanthorrhiza). The disease was observed on coriander, in Cristalina, Goiás State, on parsley in Gama, the Federal District and on Peruvian carrot in Ibiá, Minas Gerais State. Pathogenicity tests demonstrated that the fungus S. sclerotiorum is the causal agent of the observed symptoms in these plants. The three isolates obtained from naturally infected plants were inoculated in coriander (cv. Verdão), parsley (cv. Lisa Gigante), Peruvian carrot (cv. Amarela de Senador Amaral) and carrot (cv. Forto Nantes) and they were pathogenic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arracacia xanthorrhiza; Coriandrum sativum; Petroselinum crispum; White mold; Etiology. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362011000100021 |
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| COSTA, R. V.; COTA, L. V.; SILVA, D. D. da; FIGUEIREDO, J. E. F.; CASELA, C. R.; LANZA, F. E.; ZAMBOLIM, L.; PACCOLA-MEIRELLES, L. D.. |
| Mancha-branca-do milho (MBM), também conhecida como mancha-de-feosféria (MF), tornou-se uma das mais importantes doenças do milho no Brasil. A etiologia da MBM/MF permanece objeto de controvérsia e debate. Este estudo teve como objetivo testar o fungo Phaeosphaeria maydis e a bactéria Pantoea ananatis como agentes causadores da doença MBM/MF. As identidade dos isolados bacterianos foi confirmada por primers específicos da espécie P. ananatis. O fungo P. maydis foi isolado a partir de plantas do híbrido comercial DAS657 sensível a MBM/MF. Plantas de DAS657 foram inoculadas com P. ananatis (HR+) e P. maydis em casa de vegetação. Plantas inoculadas com P. ananatis reproduziram sintomas típicos da doença MBM/MF e P. ananatis foi consistentemente reisolada das... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Postulado de Koch; Doença de planta; Fungo; Bactéria; Zea mays; Etiologia; Plant diseases and disorders; Etiology. |
| Ano: 2013 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/979808 |
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| BITTENCOURT, C. B.; LINS, P. de C.; BOARI, A. de J.; QUIRINO, B. F.; TEIXEIRA, W. G.; SOUZA JUNIOR, M. T.. |
| Abstract: Fatal yellowing disease (FY) is a bud rot-type disease that severely affects oil palm plantations in Latin America. Since 1974, when it was first reported in Brazil, this disorder has been responsible for severe economic losses in the oil palm industry; and, for nearly 50 years, several studies have tried to identify its causal agent, without success. The etiological studies regarding FY in oil palm explored either biotic and abiotic stress scenarios, in a single or combined manner. Most recently, the hypothesis in favor of one biotic cause has lost some grounds to the abiotic one, mainly due to new insights regarding deficient aeration in the soil, which reduces the potential for oxy-reduction, causing changes in the ionic composition of the... |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Amarelecimento letal; Fatal yellowing; Dendê; Epidemiology; Palm oils; Abiotic stress; Biotic stress; Etiology; Elaeis; Tropical agriculture. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1135533 |
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| Paillard, Christine; Leroux, Frederique; Borrego, Juan. |
| The main microbial diseases affecting marine cultured bivalves have been revised on the basis of the etiologic agents, pathogenesis and pathogenicity. Several recent bivalve-interaction models have been studied, including Pecten larvae-Vibrio pectinicida, brown ring disease, juvenile oyster disease, Pacific oyster nocardiosis and summer mortalities of oysters. In addition, the taxonomy and phylogeny of new potential bivalve pathogens and their virulence factors have been established. Facing the difficulty of identifying bacterial strains associated with molluscan diseases (mainly vibriosis), polyphasic approaches have been developed to correlate the phenotype and genotype of potential pathogens. By evaluating likely virulence mechanisms, developing... |
| Tipo: Text |
Palavras-chave: Diagnostic tools; Virulence factors; Pathogenicity; Pathogenesis; Etiology; Bivalve mollusc; Vibriosis. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-407.pdf |
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| Henz,Gilmar Paulo; Reifschneider,Francisco José Becker; Duarte,Valmir. |
| The objetive of this work was to identify the pectolytic bacteria associated with soft rot of arracacha roots in Brazil. From 1998 to 2001, 227 isolates of Erwinia spp. were obtained from arracacha roots and identified by biochemical and physiological tests (pectolytic activity, lecithinase, a-methyl glucoside, phosphatase, erythromycin sensivity, growth at 37ºC). Of these isolates, 89.9% were identified as E. chrysanthemi (Ech), 9.7% as E. carotovora subsp. carotovora (Ecc) and 0.5% as E. carotovora subsp. atroseptica. The identity of seventeen out of twenty representative isolates of Ech and Ecc was confirmed by PCR (primers '149f', 'L1r', 'ADE1', 'ADE2'). |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arracacia xanthorrhiza; Pectobacterium; Peruvian carrot; Disease; Etiology. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006001000015 |
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| COSTA,JAQUELINE FIGUEREDO DE OLIVEIRA; ASSUNÇÃO,IRAÍLDES PEREIRA; LIMA,GAUS SILVESTRE DE ANDRADE; MUNIZ,MARIA DE FÁTIMA SILVA; LUZ,EDNA DORA MARTINS NEWMAN. |
| ABSTRACT In 2013, soursop trees showing symptoms of root rot were observed in a field in Maceió, state of Alagoas, Brazil. It was isolated Phytophthora sp. which pathogenicity was confirmed in the host seedlings. Morphological and physiological characteristics in carrot-agar modified medium were consistent with Phytophthora nicotianae description. The PCR sequences products obtained with ITS1/ITS4 primers were compared to sequences of ribosomal DNA of Phytophthora species from the GenBank database observing high identity with other P. nicotianae isolates. A phylogenetic tree was performed to compare the isolate with other sequences of P. nicotianae, which clustering has been verified with 99% of bootstrap, confirming the morphophysiological studies. This... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Annona muricata; Phytophthora wilt; Oomycete; Etiology. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000300405 |
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| Reis,Ailton; Boiteux,Leonardo S.; Paz-Lima,Milton L.; Silva,Patrícia P.; Lopes,Carlos A.. |
| A powdery mildew disease was observed on leaves of Solanum gilo, S. melongena, S. tuberosum S. chacoense, Nicotiana rustica and N. tabacum in Brasília (Federal District), Brazil. Symptoms were mainly characterized by adaxial yellow areas in the leaves corresponding to white fungal colonies on the abaxial surface. Profuse sporulation was often observed. Light microscopy of the fungal colonies revealed the presence of conidiophores emerging through stomata with some having two or three branches. Ellipsoidal, subhyaline conidia were predominantly born singly and terminally on the conidiophore. All morphometrical characteristics agreed with those of Oidiopsis haplophylli (Syn. O. sicula). The teleomorph (Leveillula taurica) was not observed. Inoculation tests... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Etiology; Solanum gilo; S. melongena; S. tuberosum; S. chacoense; Nicotiana tabacum; N. rustica; Powdery mildew; Leveillula taurica. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000200017 |
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| Ribeiro,M.G.; Lara,G.H.B.; Bicudo,S.D.; Souza,A.V.G.; Salerno,T.; Siqueira,A.K.; Geraldo,J.S.. |
| Relata-se, pela primeira vez no Brasil, a ocorrência de mastite gangrenosa caprina atípica causada pela co-infecção por Staphylococcus aureus, Clostridium perfringens e Escherichia coli em uma cabra da raça Boer, na segunda semana de lactação. Descrevem-se os achados clínicos, os procedimentos de diagnóstico microbiológico e a conduta terapêutica. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Goat; Gangrenous mastitis; Etiology; Co-infection. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352007000300037 |
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| Registros recuperados: 30 | |
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