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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Development and validation of a standard area diagram set to estimate severity of grapevine downy mildew on Vitis labrusca

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Author(s):
Camargo, Meyriele P. [1] ; Momesso, Bruna V. [1] ; Hahn, Marlon H. [2] ; Duarte, Henrique S. S. [2]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Dept Fitopatol & Nematol, Piracicaba, SP - Brazil
[2] Univ Fed Parana, Dept Fitotecnia & Fitossanidade, Curitiba, PR - Brazil
Total Affiliations: 2
Document type: Journal article
Source: European Journal of Plant Pathology; v. 155, n. 3, p. 1033-1038, NOV 2019.
Web of Science Citations: 0
Abstract

The aim of the present study was to develop and validate a standard area diagram set (SADs) to evaluate severity of grapevine mildew (Plasmopara viticola) for Vitis labrusca cultivars. SADs contain 10 disease severity levels (0.5; 2; 5; 10; 20; 30; 40; 50; 60 and 72%). Validation was performed using a sequence of 50 images assessed by 16 raters with no previous experience in quantifying plant disease severity. By Lin's concordance correlation coefficient analysis, there was an improvement in u (no SADs = 0.361, with SADs = -0.030), upsilon (no SADs = 1.456, with SADs = 0.997), C-b (no SADs = 0.864, with SADs = 0.979), r (no SADs = 0.897, with SADs = 0.937) and rho(c) (no SADs = 0.774, with SADs = 0.918) parameters, showing an increase in accuracy and precision of the estimated disease severity using SADs when compared to the non-use of SADs. Reliability improvement was also observed, with increase in R-2 values when SADs were used (no SADs = 0.790, with SADs = 0.846). Therefore, SADs improved accuracy, precision and reliability of grape downy mildew severity estimates in Vitis labrusca. (AU)

FAPESP's process: 14/05522-8 - Spatio-temporal progress of grapevine rust and downy mildew in plants with different architectures
Grantee:Meyriele Pires de Camargo
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 15/26106-5 - Grapevine downy mildew: temporal and spatial disease progress, population diversity and role of sexual reproduction in epidemic dynamics in subtropical regions
Grantee:Meyriele Pires de Camargo
Support Opportunities: Scholarships abroad - Research Internship - Doctorate