Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Semina. Ciências Agrárias (Online) |
Texto Completo: | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/36850 |
Resumo: | Bacterial leaf blight occurs in almost the entire Brazilian territory and can cause significant economic damage. However, its effects can be curtailed with the following tools that aid in quantification for carrying out the best severity assessment that can be applied to the studies used in its control. The objective of this study was to develop and validate a diagrammatic scale to quantify the severity of bacterial leaf blight in maize caused by Pseudomonas avenae. Corn leaves were collected with different levels of disease severity, and the total leaf area as well as the injured area of the middle third of each leaf was measured. From this, the minimum and maximum limits of the disease and, subsequently, four intermediate levels were determined whilst taking into account the law of visual stimulus of Weber-Fechner. Levels 1.5%, 2.5%, 9%, 18%, 46%, and 70% were selected with validation performed by eight evaluators, four inexperienced and four experienced. These evaluators estimated the severity values, initially without the use of the proposed diagrammatic scale and in a second attempt with the use of the scale. We concluded that it was possible to improve the accuracy and precision of the evaluators when they used the scale as a tool to assess the severity of bacterial leaf blight on corn leaves. |
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Semina. Ciências Agrárias (Online) |
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Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maizeValidação de escala diagramática para quantificação da mancha bacteriana da folha (causada por Pseudomonas avenae) em milhoDisease assessmentPathometryZea mays L.Quantificação de doençaPatometriaZea mays L.Bacterial leaf blight occurs in almost the entire Brazilian territory and can cause significant economic damage. However, its effects can be curtailed with the following tools that aid in quantification for carrying out the best severity assessment that can be applied to the studies used in its control. The objective of this study was to develop and validate a diagrammatic scale to quantify the severity of bacterial leaf blight in maize caused by Pseudomonas avenae. Corn leaves were collected with different levels of disease severity, and the total leaf area as well as the injured area of the middle third of each leaf was measured. From this, the minimum and maximum limits of the disease and, subsequently, four intermediate levels were determined whilst taking into account the law of visual stimulus of Weber-Fechner. Levels 1.5%, 2.5%, 9%, 18%, 46%, and 70% were selected with validation performed by eight evaluators, four inexperienced and four experienced. These evaluators estimated the severity values, initially without the use of the proposed diagrammatic scale and in a second attempt with the use of the scale. We concluded that it was possible to improve the accuracy and precision of the evaluators when they used the scale as a tool to assess the severity of bacterial leaf blight on corn leaves.A mancha bacteriana da folha ocorre em praticamente todo o território brasileiro e pode causar perdas econômicas significativas sendo necessárias ferramentas que auxiliem na sua quantificação a fim de realizar melhor avaliação de severidade podendo contribuir em estudos visando seu controle. Diante do exposto, o objetivo deste estudo foi desenvolver e validar a escala diagramática para quantificação da severidade da mancha bacteriana da folha em milho causada por Pseudomonas avenae. Foram coletada folhas de milho apresentando diferentes níveis de severidade da doença, e mediu-se a área foliar total e a área lesionada do terço médio de cada uma das folhas, determinando-se os limites mínimo e máximo da doença, e, posteriormente, os quatro níveis intermediários levando em consideração a lei do estímulo visual de Weber-Fechner. Foram selecionados os níveis 1,5%, 2,5%, 9%, 18%, 46%, e 70%, sendo a validação realizada por oito avaliadores, quatro inexperientes e quatro experientes, que estimaram os valores de severidade inicialmente sem a utilização da escala diagramática proposta, e num segundo momento com a utilização da escala. Conclui-se que foi possível melhorar a acurácia e a precisão dos avaliadores quando estes utilizaram a escala como ferramenta para avaliação de severidade para mancha bacteriana da folha do milho.UEL2020-09-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/3685010.5433/1679-0359.2020v41n6p2467Semina: Ciências Agrárias; Vol. 41 No. 6 (2020); 2467-2480Semina: Ciências Agrárias; v. 41 n. 6 (2020); 2467-24801679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/36850/28051Copyright (c) 2020 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessLorenzetti, EloisaTartaro, JulianoStangarlin, José RenatoPortz, Roberto LuisKuhn, Odair JoséAlves Neto, Alfredo José2022-10-06T16:44:32Zoai:ojs.pkp.sfu.ca:article/36850Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-10-06T16:44:32Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false |
dc.title.none.fl_str_mv |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize Validação de escala diagramática para quantificação da mancha bacteriana da folha (causada por Pseudomonas avenae) em milho |
title |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize |
spellingShingle |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize Lorenzetti, Eloisa Disease assessment Pathometry Zea mays L. Quantificação de doença Patometria Zea mays L. |
title_short |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize |
title_full |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize |
title_fullStr |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize |
title_full_unstemmed |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize |
title_sort |
Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize |
author |
Lorenzetti, Eloisa |
author_facet |
Lorenzetti, Eloisa Tartaro, Juliano Stangarlin, José Renato Portz, Roberto Luis Kuhn, Odair José Alves Neto, Alfredo José |
author_role |
author |
author2 |
Tartaro, Juliano Stangarlin, José Renato Portz, Roberto Luis Kuhn, Odair José Alves Neto, Alfredo José |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Lorenzetti, Eloisa Tartaro, Juliano Stangarlin, José Renato Portz, Roberto Luis Kuhn, Odair José Alves Neto, Alfredo José |
dc.subject.por.fl_str_mv |
Disease assessment Pathometry Zea mays L. Quantificação de doença Patometria Zea mays L. |
topic |
Disease assessment Pathometry Zea mays L. Quantificação de doença Patometria Zea mays L. |
description |
Bacterial leaf blight occurs in almost the entire Brazilian territory and can cause significant economic damage. However, its effects can be curtailed with the following tools that aid in quantification for carrying out the best severity assessment that can be applied to the studies used in its control. The objective of this study was to develop and validate a diagrammatic scale to quantify the severity of bacterial leaf blight in maize caused by Pseudomonas avenae. Corn leaves were collected with different levels of disease severity, and the total leaf area as well as the injured area of the middle third of each leaf was measured. From this, the minimum and maximum limits of the disease and, subsequently, four intermediate levels were determined whilst taking into account the law of visual stimulus of Weber-Fechner. Levels 1.5%, 2.5%, 9%, 18%, 46%, and 70% were selected with validation performed by eight evaluators, four inexperienced and four experienced. These evaluators estimated the severity values, initially without the use of the proposed diagrammatic scale and in a second attempt with the use of the scale. We concluded that it was possible to improve the accuracy and precision of the evaluators when they used the scale as a tool to assess the severity of bacterial leaf blight on corn leaves. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-09-19 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/36850 10.5433/1679-0359.2020v41n6p2467 |
url |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/36850 |
identifier_str_mv |
10.5433/1679-0359.2020v41n6p2467 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/36850/28051 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2020 Semina: Ciências Agrárias http://creativecommons.org/licenses/by-nc/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2020 Semina: Ciências Agrárias http://creativecommons.org/licenses/by-nc/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
UEL |
publisher.none.fl_str_mv |
UEL |
dc.source.none.fl_str_mv |
Semina: Ciências Agrárias; Vol. 41 No. 6 (2020); 2467-2480 Semina: Ciências Agrárias; v. 41 n. 6 (2020); 2467-2480 1679-0359 1676-546X reponame:Semina. Ciências Agrárias (Online) instname:Universidade Estadual de Londrina (UEL) instacron:UEL |
instname_str |
Universidade Estadual de Londrina (UEL) |
instacron_str |
UEL |
institution |
UEL |
reponame_str |
Semina. Ciências Agrárias (Online) |
collection |
Semina. Ciências Agrárias (Online) |
repository.name.fl_str_mv |
Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL) |
repository.mail.fl_str_mv |
semina.agrarias@uel.br |
_version_ |
1799306081660305408 |