Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil
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, Par...
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Grupo Paulista de Fitopatologia
2012-12-01
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doaj-e14eefc4b95f41338a3bb7f504e6337b2020-11-25T00:33:06ZengGrupo Paulista de FitopatologiaSumma Phytopathologica0100-54052012-12-0138428028710.1590/S0100-54052012000400002S0100-54052012000400002Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern BrazilJefferson Fernandes do Nascimento0João Batista Vida1Dauri José Tessmann2Laércio Zambolim3Rafael Augusto Vieira4Ricardo Ribeiro de Oliveira5Universidade Federal de RoraimaUniversidade Estadual de MaringáUniversidade Estadual de MaringáUniversidade Federal de ViçosaUniversidade Estadual de MaringáUniversidade Estadual de MaringáAsian 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-54052012000400002&lng=en&tlng=enPakopsora pachyrhiziepidemiologiasoja |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jefferson Fernandes do Nascimento João Batista Vida Dauri José Tessmann Laércio Zambolim Rafael Augusto Vieira Ricardo Ribeiro de Oliveira |
spellingShingle |
Jefferson Fernandes do Nascimento João Batista Vida Dauri José Tessmann Laércio Zambolim Rafael Augusto Vieira Ricardo Ribeiro de Oliveira Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil Summa Phytopathologica Pakopsora pachyrhizi epidemiologia soja |
author_facet |
Jefferson Fernandes do Nascimento João Batista Vida Dauri José Tessmann Laércio Zambolim Rafael Augusto Vieira Ricardo Ribeiro de Oliveira |
author_sort |
Jefferson Fernandes do Nascimento |
title |
Progress of Asian soybean rust and airborne urediniospores of Phakopsora pachyrhizi in southern Brazil |
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 |
publisher |
Grupo Paulista de Fitopatologia |
series |
Summa Phytopathologica |
issn |
0100-5405 |
publishDate |
2012-12-01 |
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. |
topic |
Pakopsora pachyrhizi epidemiologia soja |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-54052012000400002&lng=en&tlng=en |
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