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Development and validation of a standard area diagram set to assess powdery mildew severity on watermelon leaves

Authors :
Francinete Alves Nascimento
Henrique da Silva Silveira Duarte
Flávio França Souza
Francine Hiromi Ishikawa
Alexandre Sandri Capucho
Source :
Ciência Rural, Vol 50, Iss 10 (2020)
Publication Year :
2020
Publisher :
Universidade Federal de Santa Maria, 2020.

Abstract

ABSTRACT: The development and validation of a standard area diagram set (SADs) was proposed in this study to assess the severity of powdery mildew (Podosphaera xanthii) in watermelon (Citrullus lanatus) leaves. The SADs proposed has twelve levels of severity, varying from 0.07 to 100%. The SADs were validated by 16 raters who had no previous experience in evaluating plant disease severity. Initially, the estimation of severity was performed without the use of the SADs in leaves with different levels of severity. In a second moment, the same raters estimated the disease severity using the SADs proposed. By Lin’s concordance correlation analysis, there was an improvement in precision (coefficient of correlation, r = 0.878 and r = 0.959, without and with SADs, respectively) and accuracy (bias correction factor, Cb = 0.830 and 0.982, without and with SADs, respectively) using SADs when compared to the non-use of SADs. The agreement (Lin’s concordance correlation coefficient, ρc = 0.734 and 0.952 without and with SADs, respectively) also improved using SADs. Severity estimates inter-rater were more reliable when using SADs (coefficient of determination, R2 = 0.681 without and R2 = 0.864 with SADs; Intra-class correlation coefficient, ρ = 0.759 and ρ = 0.928, without and with SADs, respectively). Therefore, SADs improved precision, accuracy and reliability of powdery mildew severity on watermelon leaves.

Details

Language :
English, Portuguese
ISSN :
16784596 and 01038478
Volume :
50
Issue :
10
Database :
Directory of Open Access Journals
Journal :
Ciência Rural
Publication Type :
Academic Journal
Accession number :
edsdoj.50f6e19f59148d8b5ef54f8fe5966be
Document Type :
article
Full Text :
https://doi.org/10.1590/0103-8478cr20200281