This paper focuses on studying the influence of herbicides on the food intake of Ummeliata insecticeps （Bosenberg et Strand） by a novel quantitative method - the fluorescence labeling method. Europium, the lanthanide chosen for the experiment, was dissolved in the soil and then absorbed by the rice plants. Sogatella furcifera eats the plants and U. insecticeps preys on S. furcifera for food. Thus, by applying a series of chemical analytical methods of extracting and invert extracting onthe tested fly louse and spider samples, the food intake ...
