Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto

Detalhes bibliográficos
Autor(a) principal: Damasceno, Vítor Flávio Furtado
Data de Publicação: 2014
Outros Autores: Furtado, Edson Luiz [UNESP], Filho, Pedro José Ferreira
Tipo de documento: Artigo
Idioma: eng
por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/0100-5405/1960
http://hdl.handle.net/11449/171702
Resumo: Cylindrocladium leaf spot on Eucalyptus (Myrtaceae) presents high occurrence in the feld, causing losses due to defoliation since the frst year of planting. The need of quantifying the disease and the lack of already published reliable scales have generated the need of elaborating and validating a diagrammatic scale to evaluate Cylindrocladium spp. leaf spot on eucalyptus crops. The study was developed in Botucatu, São Paulo, Brazil, in an E. grandis crop aged approximately two years and showing 2.5 x 3.0 meters spacing under epidemic conditions in the feld. One hundred E. grandis leaves were collected and digitalized by using a scanner, and two scales were elaborated, the frst one performed by AFSoft software to rate colors related to healthy and injured areas and the second one by manual delineating with the aid of a tablet and image treatment on GIMP and ImageJ software. Then, severity was determined based on the sample distribution. For the visual acuity test and validation of scales, leaves were subjected to severity evaluation, without and with scale, by ten raters (fve for each scale), followed by regression analysis. Comparison of scales showed that they can be used to quantify the severity of Cyllindrocladium spp. leaf spot on E. grandis, showing higher accuracy and precision with the second method. AFSoft is indicated for the elaboration of scales with small variation among the sampling tonalities and shorter work time; otherwise, manual delineating by using a tablet is indicated.
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spelling Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucaliptoComparison of two methods to elaborate and validate a diagrammatic scale for quantifying the severity of cylindrocladium leaf spot on eucalyptusAFSoftepidemiologyImageJleaf diseasephytopatometryCylindrocladium leaf spot on Eucalyptus (Myrtaceae) presents high occurrence in the feld, causing losses due to defoliation since the frst year of planting. The need of quantifying the disease and the lack of already published reliable scales have generated the need of elaborating and validating a diagrammatic scale to evaluate Cylindrocladium spp. leaf spot on eucalyptus crops. The study was developed in Botucatu, São Paulo, Brazil, in an E. grandis crop aged approximately two years and showing 2.5 x 3.0 meters spacing under epidemic conditions in the feld. One hundred E. grandis leaves were collected and digitalized by using a scanner, and two scales were elaborated, the frst one performed by AFSoft software to rate colors related to healthy and injured areas and the second one by manual delineating with the aid of a tablet and image treatment on GIMP and ImageJ software. Then, severity was determined based on the sample distribution. For the visual acuity test and validation of scales, leaves were subjected to severity evaluation, without and with scale, by ten raters (fve for each scale), followed by regression analysis. Comparison of scales showed that they can be used to quantify the severity of Cyllindrocladium spp. leaf spot on E. grandis, showing higher accuracy and precision with the second method. AFSoft is indicated for the elaboration of scales with small variation among the sampling tonalities and shorter work time; otherwise, manual delineating by using a tablet is indicated.Departamento de Ciências Ambientais, Universidade Federal de São Carlos - UFSCar, Rodovia João Leme dos Santos, Km 110-SP 264, ItingaDepartamento de Proteção Vegetal, UNESP - Campus de Botucatu, Rua José Barbosa de Barros, 1780, Cx. Postal 237Departamento de Proteção Vegetal, UNESP - Campus de Botucatu, Rua José Barbosa de Barros, 1780, Cx. Postal 237Universidade Federal de São Carlos (UFSCar)Universidade Estadual Paulista (Unesp)Damasceno, Vítor Flávio FurtadoFurtado, Edson Luiz [UNESP]Filho, Pedro José Ferreira2018-12-11T16:56:40Z2018-12-11T16:56:40Z2014-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article248-255application/pdfhttp://dx.doi.org/10.1590/0100-5405/1960Summa Phytopathologica, v. 40, n. 3, p. 248-255, 2014.0100-5405http://hdl.handle.net/11449/17170210.1590/0100-5405/1960S0100-540520140003000062-s2.0-84908544984S0100-54052014000300006.pdf38459894858333950000-0002-6924-835XScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengporSumma Phytopathologica0,258info:eu-repo/semantics/openAccess2024-04-30T18:07:32Zoai:repositorio.unesp.br:11449/171702Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-04-30T18:07:32Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
Comparison of two methods to elaborate and validate a diagrammatic scale for quantifying the severity of cylindrocladium leaf spot on eucalyptus
title Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
spellingShingle Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
Damasceno, Vítor Flávio Furtado
AFSoft
epidemiology
ImageJ
leaf disease
phytopatometry
title_short Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
title_full Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
title_fullStr Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
title_full_unstemmed Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
title_sort Comparação de dois métodos de elaboração e validação de escala diagramática para a quantificação da severidade da mancha de cylindrocladium em eucalipto
author Damasceno, Vítor Flávio Furtado
author_facet Damasceno, Vítor Flávio Furtado
Furtado, Edson Luiz [UNESP]
Filho, Pedro José Ferreira
author_role author
author2 Furtado, Edson Luiz [UNESP]
Filho, Pedro José Ferreira
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Federal de São Carlos (UFSCar)
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Damasceno, Vítor Flávio Furtado
Furtado, Edson Luiz [UNESP]
Filho, Pedro José Ferreira
dc.subject.por.fl_str_mv AFSoft
epidemiology
ImageJ
leaf disease
phytopatometry
topic AFSoft
epidemiology
ImageJ
leaf disease
phytopatometry
description Cylindrocladium leaf spot on Eucalyptus (Myrtaceae) presents high occurrence in the feld, causing losses due to defoliation since the frst year of planting. The need of quantifying the disease and the lack of already published reliable scales have generated the need of elaborating and validating a diagrammatic scale to evaluate Cylindrocladium spp. leaf spot on eucalyptus crops. The study was developed in Botucatu, São Paulo, Brazil, in an E. grandis crop aged approximately two years and showing 2.5 x 3.0 meters spacing under epidemic conditions in the feld. One hundred E. grandis leaves were collected and digitalized by using a scanner, and two scales were elaborated, the frst one performed by AFSoft software to rate colors related to healthy and injured areas and the second one by manual delineating with the aid of a tablet and image treatment on GIMP and ImageJ software. Then, severity was determined based on the sample distribution. For the visual acuity test and validation of scales, leaves were subjected to severity evaluation, without and with scale, by ten raters (fve for each scale), followed by regression analysis. Comparison of scales showed that they can be used to quantify the severity of Cyllindrocladium spp. leaf spot on E. grandis, showing higher accuracy and precision with the second method. AFSoft is indicated for the elaboration of scales with small variation among the sampling tonalities and shorter work time; otherwise, manual delineating by using a tablet is indicated.
publishDate 2014
dc.date.none.fl_str_mv 2014-01-01
2018-12-11T16:56:40Z
2018-12-11T16:56:40Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/0100-5405/1960
Summa Phytopathologica, v. 40, n. 3, p. 248-255, 2014.
0100-5405
http://hdl.handle.net/11449/171702
10.1590/0100-5405/1960
S0100-54052014000300006
2-s2.0-84908544984
S0100-54052014000300006.pdf
3845989485833395
0000-0002-6924-835X
url http://dx.doi.org/10.1590/0100-5405/1960
http://hdl.handle.net/11449/171702
identifier_str_mv Summa Phytopathologica, v. 40, n. 3, p. 248-255, 2014.
0100-5405
10.1590/0100-5405/1960
S0100-54052014000300006
2-s2.0-84908544984
S0100-54052014000300006.pdf
3845989485833395
0000-0002-6924-835X
dc.language.iso.fl_str_mv eng
por
language eng
por
dc.relation.none.fl_str_mv Summa Phytopathologica
0,258
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 248-255
application/pdf
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1799965171839401984

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