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A key sign of Botrytis infection is the proliferation of gray mold covering the diseased plant . The timing and frequency of observation are very important in the valuation of the remote sensing data for application and analysis . ) When nymphs first hatch , they are bright red with black wing pads then change to yellow with black blotches on their abdomens and black wingpads with a yellow stripe on each . In order to be effective , they must be applied at the first sign of disease and repeated every 7-10 days . Soil moisture controls plant growth , the hydrological behavior of the soil , and the ability of the soil to resist erosion . Although the sign of Botrytis is a key diagnostic feature , you must remember that Botrytis may also appear as a secondary decay fungus . For remote sensing studies , this means that perfect correlations to ground observations are unlikely and that the inherent error due to field-scale variability is of the same order of magnitude as the demonstrated accuracies of the inversion results for both active and passive microwave instruments .