Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil

Detalhes bibliográficos
Autor(a) principal: Nascimento,Jefferson Fernandes do
Data de Publicação: 2012
Outros Autores: Vida,João Batista, Tessmann,Dauri José, Zambolim,Laércio, Vieira,Rafael Augusto, Oliveira,Ricardo Ribeiro de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Summa phytopathologica (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-54052012000400002
Resumo: Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, was reported at epidemic levels in 2003/2004 and is the main soybean disease in Brazil. The aim of this study was to investigate the spread of Asian soybean rust and to quantify airborne urediniospores in the region of Campo Mourão, Paraná State, Brazil. Three experiments were conducted under field conditions during the 2007/08 and 2008/09 crop seasons. Using the disease gradient method, provided by the application of increasing levels of the fungicide tebuconazole, four Asian soybean rust epidemics at different intensities were obtained in each experiment. To quantify the urediniospores, weathercock-type spore collectors were installed during and between the two crop seasons. Disease progress curves were plotted for each epidemic, and maximum severity was estimated. The curves were fit to the logistic model, which provided higher coefficients of determination and more randomly distributed residuals plotted over time. Analyses of the area under the disease progress curve showed that the largest epidemics occurred in the 2007/2008 crop season and that the progress rates were higher for severity, even among plants protected with the fungicide. The number of urediniospores collected in the air was related to the presence of soybean plants in the cultivated crops. The quantity of urediniospores was also positively correlated to the disease severity and incidence, as well as to cumulative rainfall and favorable days for P. Pachyrhizi infection.
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spelling Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazilsoybeansoybean diseaseepidemiologyAsian soybean rust, caused by the fungus Phakopsora pachyrhizi, was reported at epidemic levels in 2003/2004 and is the main soybean disease in Brazil. The aim of this study was to investigate the spread of Asian soybean rust and to quantify airborne urediniospores in the region of Campo Mourão, Paraná State, Brazil. Three experiments were conducted under field conditions during the 2007/08 and 2008/09 crop seasons. Using the disease gradient method, provided by the application of increasing levels of the fungicide tebuconazole, four Asian soybean rust epidemics at different intensities were obtained in each experiment. To quantify the urediniospores, weathercock-type spore collectors were installed during and between the two crop seasons. Disease progress curves were plotted for each epidemic, and maximum severity was estimated. The curves were fit to the logistic model, which provided higher coefficients of determination and more randomly distributed residuals plotted over time. Analyses of the area under the disease progress curve showed that the largest epidemics occurred in the 2007/2008 crop season and that the progress rates were higher for severity, even among plants protected with the fungicide. The number of urediniospores collected in the air was related to the presence of soybean plants in the cultivated crops. The quantity of urediniospores was also positively correlated to the disease severity and incidence, as well as to cumulative rainfall and favorable days for P. Pachyrhizi infection.Grupo Paulista de Fitopatologia2012-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-54052012000400002Summa Phytopathologica v.38 n.4 2012reponame:Summa phytopathologica (Online)instname:Grupo Paulista de Fitopatologiainstacron:GPF10.1590/S0100-54052012000400002info:eu-repo/semantics/openAccessNascimento,Jefferson Fernandes doVida,João BatistaTessmann,Dauri JoséZambolim,LaércioVieira,Rafael AugustoOliveira,Ricardo Ribeiro deeng2013-01-22T00:00:00Zoai:scielo:S0100-54052012000400002Revistahttp://www.scielo.br/sphttps://old.scielo.br/oai/scielo-oai.phpsumma@fca.unesp.br1980-54540100-5405opendoar:2013-01-22T00:00Summa phytopathologica (Online) - Grupo Paulista de Fitopatologiafalse
dc.title.none.fl_str_mv Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
title Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
spellingShingle Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
Nascimento,Jefferson Fernandes do
soybean
soybean disease
epidemiology
title_short Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
title_full Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
title_fullStr Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
title_full_unstemmed Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
title_sort Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
author Nascimento,Jefferson Fernandes do
author_facet Nascimento,Jefferson Fernandes do
Vida,João Batista
Tessmann,Dauri José
Zambolim,Laércio
Vieira,Rafael Augusto
Oliveira,Ricardo Ribeiro de
author_role author
author2 Vida,João Batista
Tessmann,Dauri José
Zambolim,Laércio
Vieira,Rafael Augusto
Oliveira,Ricardo Ribeiro de
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Nascimento,Jefferson Fernandes do
Vida,João Batista
Tessmann,Dauri José
Zambolim,Laércio
Vieira,Rafael Augusto
Oliveira,Ricardo Ribeiro de
dc.subject.por.fl_str_mv soybean
soybean disease
epidemiology
topic soybean
soybean disease
epidemiology
description Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, was reported at epidemic levels in 2003/2004 and is the main soybean disease in Brazil. The aim of this study was to investigate the spread of Asian soybean rust and to quantify airborne urediniospores in the region of Campo Mourão, Paraná State, Brazil. Three experiments were conducted under field conditions during the 2007/08 and 2008/09 crop seasons. Using the disease gradient method, provided by the application of increasing levels of the fungicide tebuconazole, four Asian soybean rust epidemics at different intensities were obtained in each experiment. To quantify the urediniospores, weathercock-type spore collectors were installed during and between the two crop seasons. Disease progress curves were plotted for each epidemic, and maximum severity was estimated. The curves were fit to the logistic model, which provided higher coefficients of determination and more randomly distributed residuals plotted over time. Analyses of the area under the disease progress curve showed that the largest epidemics occurred in the 2007/2008 crop season and that the progress rates were higher for severity, even among plants protected with the fungicide. The number of urediniospores collected in the air was related to the presence of soybean plants in the cultivated crops. The quantity of urediniospores was also positively correlated to the disease severity and incidence, as well as to cumulative rainfall and favorable days for P. Pachyrhizi infection.
publishDate 2012
dc.date.none.fl_str_mv 2012-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-54052012000400002
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-54052012000400002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-54052012000400002
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Grupo Paulista de Fitopatologia
publisher.none.fl_str_mv Grupo Paulista de Fitopatologia
dc.source.none.fl_str_mv Summa Phytopathologica v.38 n.4 2012
reponame:Summa phytopathologica (Online)
instname:Grupo Paulista de Fitopatologia
instacron:GPF
instname_str Grupo Paulista de Fitopatologia
instacron_str GPF
institution GPF
reponame_str Summa phytopathologica (Online)
collection Summa phytopathologica (Online)
repository.name.fl_str_mv Summa phytopathologica (Online) - Grupo Paulista de Fitopatologia
repository.mail.fl_str_mv summa@fca.unesp.br
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