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

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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), υ (no SADs = 1.456, with SADs = 0.997), Cb (no SADs = 0.864, with SADs = 0.979), r (no SADs = 0.897, with SADs = 0.937) and ρc (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 R2 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.

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Acknowledgments

The authors acknowledge CAPES and FAPESP (Projects 2014/05522-8 and 2015/26106-5) for project funding.

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Authors and Affiliations

  1. Departamento de Fitopatologia e Nematologia, Universidade de São Paulo, Piracicaba, SP, Brazil

    Meyriele P. Camargo & Bruna V. Momesso

  2. Departamento de Fitotecnia e Fitossanidade, Universidade Federal do Paraná, Curitiba, PR, Brazil

    Marlon H. Hahn & Henrique S. S. Duarte

Authors
  1. Meyriele P. Camargo
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  2. Bruna V. Momesso
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  3. Marlon H. Hahn
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  4. Henrique S. S. Duarte
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Correspondence to Meyriele P. Camargo.

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Camargo, M.P., Momesso, B.V., Hahn, M.H. et al. Development and validation of a standard area diagram set to estimate severity of grapevine downy mildew on Vitis labrusca. Eur J Plant Pathol 155, 1033–1038 (2019). https://doi.org/10.1007/s10658-019-01806-y

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