Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn
Autor(a) principal: | |
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Data de Publicação: | 2007 |
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=S0100-41582007000200003 |
Resumo: | A model to estimate damage caused by gray leaf spot of corn (Cercospora zea-maydis) was developed from experimental field data gathered during the summer seasons of 2000/01 and during the second crop season [January-seedtime] of 2001, in the southwest of Goiás state. Three corn hybrids were grown over two seasons and on two sites, resulting in 12 experimental plots. A disease intensity gradient (lesions per leaf) was generated through application, three times over the season, of five different doses of the fungicide propiconazol. From tasseling onward, disease intensity on the ear leaf (El), and El - 1, El - 2, El + 1, and El + 2, was evaluated weekly. A manual harvest at the physiological ripening stage was followed by grain drying and cleaning. Finally, grain yield in kg.ha-1 was estimated. Regression analysis, performed between grain yield and all combinations of the number of lesions on each leaf type, generated thirty linear equations representing the damage function. To estimate losses caused by different disease intensities at different corn growth stages, these models should first be validated. Damage coefficients may be used in determining the economic damage threshold. |
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Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corngray leaf spotZea mayslossesA model to estimate damage caused by gray leaf spot of corn (Cercospora zea-maydis) was developed from experimental field data gathered during the summer seasons of 2000/01 and during the second crop season [January-seedtime] of 2001, in the southwest of Goiás state. Three corn hybrids were grown over two seasons and on two sites, resulting in 12 experimental plots. A disease intensity gradient (lesions per leaf) was generated through application, three times over the season, of five different doses of the fungicide propiconazol. From tasseling onward, disease intensity on the ear leaf (El), and El - 1, El - 2, El + 1, and El + 2, was evaluated weekly. A manual harvest at the physiological ripening stage was followed by grain drying and cleaning. Finally, grain yield in kg.ha-1 was estimated. Regression analysis, performed between grain yield and all combinations of the number of lesions on each leaf type, generated thirty linear equations representing the damage function. To estimate losses caused by different disease intensities at different corn growth stages, these models should first be validated. Damage coefficients may be used in determining the economic damage threshold.Sociedade Brasileira de Fitopatologia2007-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000200003Fitopatologia Brasileira v.32 n.2 2007reponame:Fitopatologia Brasileirainstname:Sociedade Brasileira de Fitopatologia (SBF)instacron:SBF10.1590/S0100-41582007000200003info:eu-repo/semantics/openAccessReis,Erlei M.Santos,Jones A.P.Blum,Marta Maria C.eng2007-06-14T00:00:00Zoai:scielo:S0100-41582007000200003Revistahttp://www.scielo.br/fbONGhttps://old.scielo.br/oai/scielo-oai.php||sbf-revista@ufla.br1678-46770100-4158opendoar:2007-06-14T00:00Fitopatologia Brasileira - Sociedade Brasileira de Fitopatologia (SBF)false |
dc.title.none.fl_str_mv |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn |
title |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn |
spellingShingle |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn Reis,Erlei M. gray leaf spot Zea mays losses |
title_short |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn |
title_full |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn |
title_fullStr |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn |
title_full_unstemmed |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn |
title_sort |
Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn |
author |
Reis,Erlei M. |
author_facet |
Reis,Erlei M. Santos,Jones A.P. Blum,Marta Maria C. |
author_role |
author |
author2 |
Santos,Jones A.P. Blum,Marta Maria C. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Reis,Erlei M. Santos,Jones A.P. Blum,Marta Maria C. |
dc.subject.por.fl_str_mv |
gray leaf spot Zea mays losses |
topic |
gray leaf spot Zea mays losses |
description |
A model to estimate damage caused by gray leaf spot of corn (Cercospora zea-maydis) was developed from experimental field data gathered during the summer seasons of 2000/01 and during the second crop season [January-seedtime] of 2001, in the southwest of Goiás state. Three corn hybrids were grown over two seasons and on two sites, resulting in 12 experimental plots. A disease intensity gradient (lesions per leaf) was generated through application, three times over the season, of five different doses of the fungicide propiconazol. From tasseling onward, disease intensity on the ear leaf (El), and El - 1, El - 2, El + 1, and El + 2, was evaluated weekly. A manual harvest at the physiological ripening stage was followed by grain drying and cleaning. Finally, grain yield in kg.ha-1 was estimated. Regression analysis, performed between grain yield and all combinations of the number of lesions on each leaf type, generated thirty linear equations representing the damage function. To estimate losses caused by different disease intensities at different corn growth stages, these models should first be validated. Damage coefficients may be used in determining the economic damage threshold. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-04-01 |
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=S0100-41582007000200003 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000200003 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0100-41582007000200003 |
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.32 n.2 2007 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_ |
1754734650962477056 |