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Development and validation of a set of standard area diagrams to aid in estimation of spot blotch severity on wheat leaves
Author(s) -
Domiciano G. P.,
Duarte H. S. S.,
Moreira E. N.,
Rodrigues F. A.
Publication year - 2014
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/ppa.12150
Subject(s) - concordance correlation coefficient , concordance , correlation , set (abstract data type) , correlation coefficient , statistics , mathematics , biology , computer science , geometry , programming language , bioinformatics
This study aimed to develop and validate a standard area diagram ( SAD ) set to quantify the severity of spot blotch, caused by B ipolaris sorokiniana , on wheat leaves. The proposed SAD set includes images of leaves with 11 distinct disease severities (0·1, 1, 5, 10, 20, 30, 40, 50, 60, 70 and 83%). The SAD set was validated by 12 raters without experience in evaluating plant disease. Lin's concordance correlation analysis of estimated versus actual disease severity (based on image analysis) showed that precision and accuracy improved for all raters using the SAD set in contrast to assessments made without it. The SAD set improved accuracy (coefficient of bias, C b = 0·88 and 0·99, without and with the SAD set, respectively) and agreement (Lin's concordance correlation coefficient, ρ c = 0·81 and 0·96 without and with the SAD set, respectively) of the estimates of severity. The severity estimates were also more reliable when using the SAD set (coefficient of determination, R 2 = 0·76 unaided and R 2 = 0·92 with the SAD set, and intra‐class correlation ρ = 0·79 without the SAD set and ρ = 0·95 using the SAD set). The SAD set proposed in this study will improve the accuracy and reliability of estimates of spot blotch severity on wheat leaves.