Fungal pathogens of glasshouse plants represent a major constraint for optimum production and product quality. Significant changes in the reflected wavelengths of the near-infrared portion of the electromagnetic spectrum occur when reflectance measurements are obtained from plants infected by fungal pathogens and also from plants covered with sooty mold. Data was collected from several species of citrus seedlings (Citrus sinensis, C. aurantium, C. paradisi and Poncirus trifoliata), Bo seedlings (Ficus religiosa), and cantaloupe (Cucumis melo reticulata) propagated under natural lighting conditions in the glasshouse. Spectroradiometric measurements and color infrared (CIR) images of control, honeydew only, and sooty molded leaves from F. religiosa, C. sinensis, C. aurantium, and P. trifoliata were obtained. C. paradisi infected with the greasy spot fungus (Mycosphaerella citri) was also imaged under glasshouse lighting. Similar data was obtained from healthy foliage of C. melo reticulata and foliage with various levels of powdery mildew (Sphaerotheca fuliginea) infection.
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