Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn

Detalhes bibliográficos
Autor(a) principal: Reis,Erlei M.
Data de Publicação: 2007
Outros Autores: Santos,Jones A.P., Blum,Marta Maria C.
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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spelling 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
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