Detecting infestation of take-all disease in wheat using Landsat Thematic Mapper imagery
International Journal of Remote Sensing
International Journal of Remote Sensing
Computers and Electronics in Agriculture
SAS/STAT 9.2 User's Guide: Survival Analysis
SAS/STAT 9.2 User's Guide: Survival Analysis
Computers and Electronics in Agriculture
Detecting powdery mildew of winter wheat using leaf level hyperspectral measurements
Computers and Electronics in Agriculture
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Ultraviolet, visible, and near-infrared reflectance spectroscopy was used to determine the disease severity of tomato (Lycopersicon esculentum) leaves infected with Xanthomonas perforans, the causal agent of bacterial leaf spot of tomato. Chemometric methods were used to identify significant wavelengths and create spectral-based prediction models. Significant wavelengths were identified through analysis of the B-matrix from partial least squares (PLS) regression, analysis of a correlation coefficient spectrum, and through the use of a stepwise multiple linear regression (SMLR) procedure. These analysis methods revealed several significant regions wavelengths and produced predictive models of disease severity based on absorbance spectra. The best model predicted the disease severity of the validation data set with a root mean square difference (RMSD) of 4.9% and a coefficient of determination (R^2) of 0.82. The results of this initial study indicate the potential for the use of spectral technology to detect bacterial leaf spot of tomato in the field.