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The concentration of plant pigments in excreta vs. food provided a measure of disgestibility of most plants by grasshoppers. Digestibility values obtained with the chromogen-ratio method and consumption-excretion ratios were highly correlated (r = 0.789**). Greatly disparate results were obtained in 4 cases. The chromogen method, when applicable, gave better duplicability and eliminated many of the errors and much labor associated with consumption-excretion ratios.

Chromogen-Ratio Method for Determining Digestibility of Plants by Grasshoppers1