The energy budgets for all development stages of brown planthopper (bph), Nilaparvate lugens, and Theridion octomaculatum were estimated at 30c. Their growth production, egg production, respiiation and energy content of exuvia and webbing were determined.Based on a systematic survey of population number of bph and T.octomaculatum, and the determination of biomass and energy of rice during late lice, the energy flow chart for rice-bph-T. octomaculatum ecosystem was given. The net production efficiency, ecolo...