The phenomenology of genetically engineered plant sentinels as measured by spectral imaging remote sensors is investigated. Plant sentinels have been developed to cease chlorophyll production and rapidly turn white in the presence of a chemical inducer such as hazardous chemicals or environmental pollutants. This work investigates the use of spectral imaging technology to detect the de-greening phenomena remotely. Results demonstrate successful detection of the de-greening phenomena even in the presence of benignly stressed plants.