Thermographic medium-far ground-based proximal sensing for in-field wheat Stagonospora nodorum blotch detection
Antonucci, F.; Menesatti, P.; Iori, A.; Pallottino, F.; D’Egidio, M. G.; Costa, C.
Journal of Plant Diseases and Protection
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EUGEN ULMER GMBH CO
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Thermal imaging is a potential remote sensing tool for estimating fungal wheat diseases. This study for the first time investigated the suitability of infrared thermography as rapid non-destructive technique to detect Stagonospora nodorum blotch wheat infection observing differences in temperatures due to loss of water content in infected wheat. Analyses were conducted in-field using medium-far ground-based proximal sensing technique. The study demonstrated statistically significant differences between images relative to different plots planted with two cultivars treated with three different conditions: artificially inoculated with Stagonospora nodorum (IN), treated with fungicide (TT) and not inoculated nor treated (NT). This study is oriented on medium-far ground-based proximal sensing in order to frame an area of medium extension (~10–20 m2), placing the acquisition system at the bottom of each plot with a height of 4 m. Fiftythree thermal images of durum wheat plants have been acquired at growth stage 83, with a FLIR (S40) thermocamera. A randomized split-plot design with three replicates has been utilized. Regions of interest were extracted from each plot image and thus, mean temperature and relative ± standard deviation were calculated. The two-tailed (Wilcoxon) Mann-Whitney U test has been used to evidence whether the medians of couples of diverse treatments were different. Considering the whole samples significant differences (p < 0.05) have been observed between IN and TT.