Abstract: According to the survey data of the population dynamics of brown planthopper (BPH) (Nilaparvata lugens Stl) in single late rice fields in Tanhu Lake district of Jiangsu province, the simulating model of population dynamics of BPHwas obtained with the frame of boxcar train model presented by Goudriaan (1973). Further, based on the population dynamic model, economic losses of rice and cost of control, the management model of BPHwas established with the Bellman dynamic programming method. Simulation results show that the models can well describe the population dynamic process according to the verification with observations of BPHin Chuansha county from 1984 to 1989. The error and average error of accumulative, population are 1.4%—16.3% and 11.4% respectively. Because of the difference of standards in judgement, the results of two methods are different between experimental and optimal decisions.

Key words: Brown planthopper, Management model