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Boxplots show the capability of (A) NDWI and (B) WI in discriminating between the Zymoseptoria tritici un-treated (T0) and treated canopies (T1) of the four reference varieties (CH CLARO, DRIFTER, RUNAL, and TITLIS) in different sampling periods, and ROC plots show the comparison of NDWI and WI at the early (C, Weeks 1–3) and late (D, Weeks 4–6) periods.
