Abstract
A new model for calculating the directional spectral reflectance of vegetative canopies was verified for the case of mature corn by field reflectance measurements on two different mature corn fields at each of two viewing angles and over the visible and near infrared spectral bands. The application of the model to hypothetical conditions indicates that moderately severe Southern Corn Leaf Blight should be marginally detectable by aerial photography under certain special circumstances and that for more severe blight, the blight condition should be distinguishable from moisture stress. The application of the model to hypothetical fields of young corn indicates that the blight condition should be easily detected under a wide range of circumstances.
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