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The brown planthopper (BPH: Nilaparvata lugens (Stål)) occurrence time series data from June to November of 1986–1998 in Taihu Lake area, Jingsu province, China, were used to calculate correlation dimension (D 2 (m)) and the second-order Renyi entropy (k 2 ). Based on the methods of the approximation Kolmogorov's entropy and phase space extension, the average predictable time scale...