In order to achieve the optimized pest control, correct estimation of pest densities is a prerequisite to monitor pest damage and to provide efficient pest management plans. Parameters regarding diffusion (e.g., diffusion constant) and population size (e.g., growth rate) were estimated by using diffusion equation. The time series dispersal data of Whiteflies collected in greenhouse were used for modeling. Cross-correlation analysis was conducted to reveal the range and direction of pest population invasion. Sampling theory was further investigated regarding estimation of densities, and population dynamics of Whiteflies were discussed in two dimensions.

• Tuyen Van Nguyen(Department of Mathematics, Pusan National University, Department of Biological Science, Pusan National University, Department of Electronics Engineering, Pusan National University)
• Chunlei Xia(Department of Electronics Engineering, Pusan National University)
• Bu-Keun Chung(Division of Plant Environment, Gyeongsangnam-do Agricultural Researches & Extension Services)
• Hwang-Yong Kim(Applied Entomology Division, National Academy of Agricultural Science, Rural Development Administration)
• Tae-Soo Chon(Department of Biological Science, Pusan National University)