Title:	Development and validation of a standard area diagram set to assess powdery mildew severity on watermelon leaves.
Authors:	NASCIMENTO, F. A. DUARTE, H. da S. S. SOUZA, F. de F. ISHIKAWA, F. H. CAPUCHO, A. S.
Affiliation:	FRANCINETE ALVES NASCIMENTO, UNIVASF; HENRIQUE DA SILVA SILVEIRA DUARTE, UFPR; FLAVIO DE FRANCA SOUZA, CPATSA; FRANCINE HIROMI ISHIKAWA, UNIVASF; ALEXANDRE SANDRI CAPUCHO, UNIVASF.
Date Issued:	2020
Citation:	Ciência Rural, v. 50, n. 10, e20200281, 2020.
Description:	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, espectively) 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.
Thesagro:	Melancia Doença Oídio Citrullus Lanatus
NAL Thesaurus:	Disease severity Watermelons
Keywords:	Podosphaera xanthii Avaliação de doenças
DOI:	http://doi.org/10.1590/0103-8478cr20200281
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATSA)