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Area under disease progress curve (AUDPC) of visual scores plotted as a function of spectral indices. Correlation coefficients (r) are for the Spearman's correlations between the spectral indices and AUDPC of STB scores (***p < 0.001). Loess fit lines are added to the scatter plot to show the trend of the relationship. Results are based on the data of the whole population (335 varieties) used in the main experiment.
