Diagrammatic scale for assessment of soybean rust severity
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Fitopatologia Brasileira |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000100011 |
Resumo: | A diagrammatic scale to assess soybean (Glycine max) rust severity, caused by the fungus Phakopsora pachyrhizi, was developed in this study. Leaflets showing different severity levels were collected for determination of the minimum and maximum severity limits; intermediate levels were determined according to "Weber-Fechner's stimulus-response law". The proposed scale showed the levels of 0.6; 2; 7; 18; 42, and 78.5%. Scale validation was performed by eight raters (four inexperienced and four experienced), who estimated the severity of 44 soybean leaflets showing rust symptoms, with and without the use of the scale. Except for rater number eight, all showed a tendency to overestimate severity without the aid of the diagrammatic scale. With the scale, the raters obtained better accuracy and precision levels, although the tendency to overestimate was maintained. Experienced raters were more accurate and precise than inexperienced raters, and assessment improvements with the use of the scale were more significant for inexperienced raters. |
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Fitopatologia Brasileira |
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Diagrammatic scale for assessment of soybean rust severitydisease assessmentGlycine maxPhakopsora pachyrhiziA diagrammatic scale to assess soybean (Glycine max) rust severity, caused by the fungus Phakopsora pachyrhizi, was developed in this study. Leaflets showing different severity levels were collected for determination of the minimum and maximum severity limits; intermediate levels were determined according to "Weber-Fechner's stimulus-response law". The proposed scale showed the levels of 0.6; 2; 7; 18; 42, and 78.5%. Scale validation was performed by eight raters (four inexperienced and four experienced), who estimated the severity of 44 soybean leaflets showing rust symptoms, with and without the use of the scale. Except for rater number eight, all showed a tendency to overestimate severity without the aid of the diagrammatic scale. With the scale, the raters obtained better accuracy and precision levels, although the tendency to overestimate was maintained. Experienced raters were more accurate and precise than inexperienced raters, and assessment improvements with the use of the scale were more significant for inexperienced raters.Sociedade Brasileira de Fitopatologia2006-02-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000100011Fitopatologia Brasileira v.31 n.1 2006reponame:Fitopatologia Brasileirainstname:Sociedade Brasileira de Fitopatologia (SBF)instacron:SBF10.1590/S0100-41582006000100011info:eu-repo/semantics/openAccessGodoy,Cláudia V.Koga,Lucimara J.Canteri,Marcelo G.eng2006-03-14T00:00:00Zoai:scielo:S0100-41582006000100011Revistahttp://www.scielo.br/fbONGhttps://old.scielo.br/oai/scielo-oai.php||sbf-revista@ufla.br1678-46770100-4158opendoar:2006-03-14T00:00Fitopatologia Brasileira - Sociedade Brasileira de Fitopatologia (SBF)false |
dc.title.none.fl_str_mv |
Diagrammatic scale for assessment of soybean rust severity |
title |
Diagrammatic scale for assessment of soybean rust severity |
spellingShingle |
Diagrammatic scale for assessment of soybean rust severity Godoy,Cláudia V. disease assessment Glycine max Phakopsora pachyrhizi |
title_short |
Diagrammatic scale for assessment of soybean rust severity |
title_full |
Diagrammatic scale for assessment of soybean rust severity |
title_fullStr |
Diagrammatic scale for assessment of soybean rust severity |
title_full_unstemmed |
Diagrammatic scale for assessment of soybean rust severity |
title_sort |
Diagrammatic scale for assessment of soybean rust severity |
author |
Godoy,Cláudia V. |
author_facet |
Godoy,Cláudia V. Koga,Lucimara J. Canteri,Marcelo G. |
author_role |
author |
author2 |
Koga,Lucimara J. Canteri,Marcelo G. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Godoy,Cláudia V. Koga,Lucimara J. Canteri,Marcelo G. |
dc.subject.por.fl_str_mv |
disease assessment Glycine max Phakopsora pachyrhizi |
topic |
disease assessment Glycine max Phakopsora pachyrhizi |
description |
A diagrammatic scale to assess soybean (Glycine max) rust severity, caused by the fungus Phakopsora pachyrhizi, was developed in this study. Leaflets showing different severity levels were collected for determination of the minimum and maximum severity limits; intermediate levels were determined according to "Weber-Fechner's stimulus-response law". The proposed scale showed the levels of 0.6; 2; 7; 18; 42, and 78.5%. Scale validation was performed by eight raters (four inexperienced and four experienced), who estimated the severity of 44 soybean leaflets showing rust symptoms, with and without the use of the scale. Except for rater number eight, all showed a tendency to overestimate severity without the aid of the diagrammatic scale. With the scale, the raters obtained better accuracy and precision levels, although the tendency to overestimate was maintained. Experienced raters were more accurate and precise than inexperienced raters, and assessment improvements with the use of the scale were more significant for inexperienced raters. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-02-01 |
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=S0100-41582006000100011 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000100011 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0100-41582006000100011 |
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 |
Sociedade Brasileira de Fitopatologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Fitopatologia |
dc.source.none.fl_str_mv |
Fitopatologia Brasileira v.31 n.1 2006 reponame:Fitopatologia Brasileira instname:Sociedade Brasileira de Fitopatologia (SBF) instacron:SBF |
instname_str |
Sociedade Brasileira de Fitopatologia (SBF) |
instacron_str |
SBF |
institution |
SBF |
reponame_str |
Fitopatologia Brasileira |
collection |
Fitopatologia Brasileira |
repository.name.fl_str_mv |
Fitopatologia Brasileira - Sociedade Brasileira de Fitopatologia (SBF) |
repository.mail.fl_str_mv |
||sbf-revista@ufla.br |
_version_ |
1754734650646855680 |