Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , |
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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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 |
repository.name.fl_str_mv |
|
repository.mail.fl_str_mv |
|
_version_ |
1749140545582661632 |