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ANALYSIS AND SIMULATION OF THE STRATEGIES OF INSECTICIDE RESISTANCE MANAGEMENT WITH A MATHEMATICAL MODEL

S. G. LI J, T. CHANG J. M. YAN(Department of Biology, Peking University, Beijing)  
A mathematical model is set up to analyze and simulate three different strategies of insecticide resistance management: the sequential use of 3-5 insecticides; the "high kill" policy, with immigration of susceptibles; and the "patch" or "checker-board" system of insecticide application, The results show that the sequential use of 3-5 insecticides, each for one generation, gives the best result provided that there is no cross resistance among the insecticides. "High kill" policy with immigration of certain mumber of susceptibles is also an effective means, though it may not be acceptable from the viewpoint of integrated pest management. "Patch" system of insecticide application is generally a failure, unless the immigration rate is very high (about one half of the initial population).
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