Models of sustainable threshold and economic profit acquirement to pest management

Based on the principles of ecology and economics in pest management,this paper established the model of sustainable threshold and economic profit acquirement,proposed the definitions of ecological cost C_e,integrated cost C_i,net acquirement velocity r,proper acquirement velocity r~* and so on,developed a new reference method surveying the pest-insect population density based on the critical point of T_s.With this model,it tried to discuss the parameters.