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Australasian Plant Pathology

, Volume 48, Issue 6, pp 603–606 | Cite as

Development and validation of a standard area diagram set for assessment of plum rust severity

  • Glória Soriano VidalEmail author
  • Barbara Lima de Souza
  • Louise Larissa May De Mio
  • Henrique da Silva Silveira Duarte
Research Note
  • 63 Downloads

Abstract

The aim of this study was to develop and validate a standard area diagram set (SADs) to aid assessment of plum rust severity. The elaborated SADs was composed of ten coloured images with different severities ranging from 0.3 to 35%. The SADs were validated in two steps (without and with SADs) by 10 raters with no experience, evaluating 50 leaves with different disease severity levels. The accuracy and precision of the estimates were determined using the Lin’s concordance correlation analysis and the reliability was measured using coefficient of determination (R2) and intraclass correlation coefficient (ρ). The SADs improved accuracy (Cb = 0.78 and 0.97, without and with SADs, respectively), precision (r = 0.87 and 0.93, without and with SADs, respectively) and Lin’s concordance correlation coefficient (ρc = 0.68 and 0.91 without and with SADs, respectively) of the severity estimates. There was greater reliability when SADs was used (R2 = 0.61 without and R2 = 0.79 with SADs, and intraclass correlation coefficient ρ = 0.45 without SADs and ρ = 0.88 with SADs). The SADs proposed here is a useful tool for improving accuracy, precision and reliability of visual assessments of plum rust severity.

Keywords

Tranzschelia discolor Phytopathometry Fungal disease 

Notes

Acknowledgements

The authors thanks the ‘Conselho Nacional de Desenvolvimento Científico e Tecnológico’ (CNPq) for the fellowship granted to the third and fourth authors. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

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Copyright information

© Australasian Plant Pathology Society Inc. 2019

Authors and Affiliations

  1. 1.Departamento de Fitotecnia e FitossanidadeUniversidade Federal do ParanáCuritibaBrazil

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