Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , |
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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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 |
_version_ |
1754193417404940288 |