Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine

Detalhes bibliográficos
Autor(a) principal: Buffara,Cláudia Regina Scapin
Data de Publicação: 2014
Outros Autores: Angelotti,Francislene, Vieira,Rafael Augusto, Bogo,Amauri, Tessmann,Dauri José, Bem,Betina Perreira de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Ciência Rural
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000801384
Resumo: The downy mildew, caused by Plasmopora viticola, is one of the most important grapevine (Vitis vinifera) diseases in Southern Brazil, causing defoliation and economic losses. The evaluation of disease severity is an important decision for adoption of strategies and tactics for disease control. Therefore, the objective of this work was to elaborate and to validate a diagrammatic scale to assess downy mildew severity in grapevine, respecting the limitations of visual acuity. The diagrammatic scale with seven levels of disease severity of 1, 3, 6, 12, 25, 50 and 75% was developed in two versions of black-and-white and color scale. The scales were tested and validated by eight raters with and without previous experience with grapevine downy mildew. The raters estimated the severity of 30 grapevine leaves with different downy mildew severity, with and without the use of the scales. Minimum, intermediate and maximum severity levels were collected according to Weber-Fechner's stimulus-response law. The accuracy and precision were analyzed by linear regression between the actual and the estimated severity. Actual severity was assessed with ASSESS(r) Program. The scales provided good levels of accuracy (means of 88%) and excellent levels of precision (means of 95%). The raters showed great precision and accuracy when used the diagrammatic scale. The color scale provided more precise and accurate estimates than the black-and-white scale. The scale proposed in this work presented appropriate applicability for downy mildew evaluation in grapevine.
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spelling Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevinedisease assessmentpathometryPlamospara viticolaVitis viniferaThe downy mildew, caused by Plasmopora viticola, is one of the most important grapevine (Vitis vinifera) diseases in Southern Brazil, causing defoliation and economic losses. The evaluation of disease severity is an important decision for adoption of strategies and tactics for disease control. Therefore, the objective of this work was to elaborate and to validate a diagrammatic scale to assess downy mildew severity in grapevine, respecting the limitations of visual acuity. The diagrammatic scale with seven levels of disease severity of 1, 3, 6, 12, 25, 50 and 75% was developed in two versions of black-and-white and color scale. The scales were tested and validated by eight raters with and without previous experience with grapevine downy mildew. The raters estimated the severity of 30 grapevine leaves with different downy mildew severity, with and without the use of the scales. Minimum, intermediate and maximum severity levels were collected according to Weber-Fechner's stimulus-response law. The accuracy and precision were analyzed by linear regression between the actual and the estimated severity. Actual severity was assessed with ASSESS(r) Program. The scales provided good levels of accuracy (means of 88%) and excellent levels of precision (means of 95%). The raters showed great precision and accuracy when used the diagrammatic scale. The color scale provided more precise and accurate estimates than the black-and-white scale. The scale proposed in this work presented appropriate applicability for downy mildew evaluation in grapevine.Universidade Federal de Santa Maria2014-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000801384Ciência Rural v.44 n.8 2014reponame:Ciência Ruralinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM10.1590/0103-8478cr20131548info:eu-repo/semantics/openAccessBuffara,Cláudia Regina ScapinAngelotti,FrancisleneVieira,Rafael AugustoBogo,AmauriTessmann,Dauri JoséBem,Betina Perreira deeng2014-11-24T00:00:00ZRevista
dc.title.none.fl_str_mv Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
title Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
spellingShingle Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
Buffara,Cláudia Regina Scapin
disease assessment
pathometry
Plamospara viticola
Vitis vinifera
title_short Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
title_full Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
title_fullStr Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
title_full_unstemmed Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
title_sort Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
author Buffara,Cláudia Regina Scapin
author_facet Buffara,Cláudia Regina Scapin
Angelotti,Francislene
Vieira,Rafael Augusto
Bogo,Amauri
Tessmann,Dauri José
Bem,Betina Perreira de
author_role author
author2 Angelotti,Francislene
Vieira,Rafael Augusto
Bogo,Amauri
Tessmann,Dauri José
Bem,Betina Perreira de
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Buffara,Cláudia Regina Scapin
Angelotti,Francislene
Vieira,Rafael Augusto
Bogo,Amauri
Tessmann,Dauri José
Bem,Betina Perreira de
dc.subject.por.fl_str_mv disease assessment
pathometry
Plamospara viticola
Vitis vinifera
topic disease assessment
pathometry
Plamospara viticola
Vitis vinifera
description The downy mildew, caused by Plasmopora viticola, is one of the most important grapevine (Vitis vinifera) diseases in Southern Brazil, causing defoliation and economic losses. The evaluation of disease severity is an important decision for adoption of strategies and tactics for disease control. Therefore, the objective of this work was to elaborate and to validate a diagrammatic scale to assess downy mildew severity in grapevine, respecting the limitations of visual acuity. The diagrammatic scale with seven levels of disease severity of 1, 3, 6, 12, 25, 50 and 75% was developed in two versions of black-and-white and color scale. The scales were tested and validated by eight raters with and without previous experience with grapevine downy mildew. The raters estimated the severity of 30 grapevine leaves with different downy mildew severity, with and without the use of the scales. Minimum, intermediate and maximum severity levels were collected according to Weber-Fechner's stimulus-response law. The accuracy and precision were analyzed by linear regression between the actual and the estimated severity. Actual severity was assessed with ASSESS(r) Program. The scales provided good levels of accuracy (means of 88%) and excellent levels of precision (means of 95%). The raters showed great precision and accuracy when used the diagrammatic scale. The color scale provided more precise and accurate estimates than the black-and-white scale. The scale proposed in this work presented appropriate applicability for downy mildew evaluation in grapevine.
publishDate 2014
dc.date.none.fl_str_mv 2014-01-01
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=S0103-84782014000801384
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000801384
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0103-8478cr20131548
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 Universidade Federal de Santa Maria
publisher.none.fl_str_mv Universidade Federal de Santa Maria
dc.source.none.fl_str_mv Ciência Rural v.44 n.8 2014
reponame:Ciência Rural
instname:Universidade Federal de Santa Maria (UFSM)
instacron:UFSM
instname_str Universidade Federal de Santa Maria (UFSM)
instacron_str UFSM
institution UFSM
reponame_str Ciência Rural
collection Ciência Rural
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repository.mail.fl_str_mv
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