Abstract
This paper presents simulation models for the dynamics of a predator-prey system consisting of the twospotted spider mite Tetranychus urticae Koch as a prey and its predator Phytoseiulus persimilis Athias-Henriot. The percentage infestation of plant has been used as a basic unit for population densities of prey and predators. Parameter estimation has been done with the inclusion of diffusion and time delay in the models. Initial ranges of parameter values have been chosen on the basis of biological information available through various publications. The parameters have been optimized by the best fit of calculated solutions to the field data. The models approximating biological field data have produced satisfactory results. Stability of the equilibria for each model has been investigated.
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