Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine
| Autor: | Dauri José Tessmann, Amauri Bogo, Cláudia Regina Scapin Buffara, Francislene Angelotti, Rafael Augusto Vieira, Betina de Bem |
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| Přispěvatelé: | CLÁUDIA REGINA SCAPIN BUFFARA, Universidade Estadual de Maringá, FRANCISLENE ANGELOTTI, CPATSA, RAFAEL AUGUSTO VIEIRA, Universidade Estadual de Maringá, AMAURI BOGO, Universidade do Estado de Santa Catarina, DAURI JOSÉ TESSMANN, Universidade Estadual de Maringá, BETINA PERREIRA DE BEM, Universidade do Estado de Santa Catarina. |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Scale (ratio)
patometria Avaliação de doenças Plamospara viticola lcsh:Agriculture Disease severity Statistics Vitis Vinifera Doença lcsh:Agriculture (General) Vitis vinifera Grapes Mathematics Fungo General Veterinary lcsh:S Disease control lcsh:S1-972 Color Scale disease assessment Diagrammatic reasoning Disease Agronomy Uva pathometry Downy mildew Animal Science and Zoology Disease assessment Míldio da videira Plasmopora viticola Agronomy and Crop Science |
| Zdroj: | Ciência Rural, Vol 44, Iss 8, Pp 1384-1391 (2014) Ciência Rural v.44 n.8 2014 Ciência Rural Universidade Federal de Santa Maria (UFSM) instacron:UFSM Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice) Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
| ISSN: | 1678-4596 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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