hrough the predation of lady bird(Coccinella septempunctata)larva to two species ofwheat aphid (Macrosiphum avenae and Rhopalosiphum padi),the present paper examined therelationships of the amount of feeding to the development rate and the growth rate of thepredators in different prey densities。The results show that the relationships of the biomassof the aphids consumed to the development rate and the growth rate of the predators are bothlinear。 Thus this coincides with Beddington’smodel.The prey density an...