Data/hora: 05/06/2024 09:57:24

Biblioteca(s): | Embrapa Acre; Embrapa Trigo.
Data corrente: | 09/01/2009
Data da última atualização: | 28/07/2021
Autoria: | GONCALVES, R. C.; LAU, D.; OLIVEIRA, J. R.; MAFFIA, L. A.; CASCARDO, J. C. M.; ALFENAS, A. C.
Afiliação: | RIVADALVE COELHO GONCALVES, CPAF-AC; DOUGLAS LAU, CNPT; José R. Oliveira, Universidade Federal de Viçosa (UFV); Luiz A. Maffia, Universidade Federal de Viçosa (UFV); Júlio C. M. Cascardo, Universidade Estadual de Santa Cruz (UESC); Acelino C. Alfenas, Universidade Federal de Viçosa (UFV).
Título: | Etiology of bacterial leaf blight of eucalyptus in Brazil.
Ano de publicação: | 2008
Fonte/Imprenta: | Tropical Plant Pathology, Brasília, DF, v. 33, n. 3, p. 180-188, May/Jun. 2008.
ISSN: | 1983-2052 (online)
DOI: | 10.1590/S1982-56762008000300002.

Idioma:

Inglês
Português

Conteúdo: | Bacterial leaf blight of eucalyptus is initially characterized by water soaked, angular, amphigenous and interveinal lesions, concentrated along the main vein, at the edges or scattered on the leaf blade. As the disease progresses, the lesions become brown to pale, and when young leaves are infected leaf cut areas at the edges or perforations at the center of the lesions may appear due to abortion of the necrotic area. Eventually, necrosis may be found on petiole and twigs. Leaf fall commonly occurs on highly susceptible genotypes due to the early senescence of diseased leaves. Precise diagnosis is accomplished by bacterial exudation from leaf sections placed in a water drop under light microscope (200 x). Twenty-five bacterial isolates from Amapá (2), Bahia (4), Minas Gerais (2), São Paulo (9), Pará (3), Mato Grosso do Sul (1), and Rio Grande do Sul (4) States, which induced hypersensitive reaction (HR) in non-host plants and were pathogenic to eucalyptus, when inoculated by inoculum injection, were identified by biochemical assays, using carbon sources (MicroLogTM BIOLOG) and sequence analysis (16S rDNA). Ten isolates were identified as Xanthomonas axonopodis, four as X. campestris, four as Pseudomonas syringae, two as P. putida, two as P. cichorii, one as Erwinia sp., and two were similar to bacterial genera of Rhizobiaceae. When spray inoculated on intact plants of eucalyptus, only X. axonopodis, P. cichorii and isolates of the Rhizobiaceae family induced typical symptoms of the disease and were considered pathogenic. In Brazil, X. axonopodis seems to be the most widespread species causing the bacterial leaf blight of Eucalyptus spp.
Palavras-Chave: | Enfermedades y desórdenes de las plantas; Erwinia rhizobiaceae; Marchitez foliar.
Thesagro: | Bactéria; Doença de planta; Etiologia; Eucalipto; Eucalyptus spp; Mancha foliar.
Thesaurus Nal: | Erwinia; Etiology; Leaf blight; Plant diseases and disorders; Pseudomonas; Rhizobiaceae; Xanthomonas.

Categoria do assunto:

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F Plantas e Produtos de Origem Vegetal

URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/116168/1/20572.pdf
Registro original: | Embrapa Acre (CPAF-AC)

Exemplares:

CPAF-AC - (20572-1) - UPC - AP - PP - SP 223 -  - 2008.01518 - DES
CPAF-AC - (20572-2) - UPC - AP - DD -  -  -  - DIS
CNPT - (11182-1) - UPC - AP - -- -  -  -  - DIS