Yipeng, Yang2020-04-282020-04-282015Monte Carlo method; mortgage-backed securities (MBS); coefficient of variation (CV); absolute convergence; relative convergence; option-adjusted spread (OAS); effective duration (DUR); effective convexity (CNVX); Greekshttps://hdl.handle.net/10657.1/2305The paradox of pesticides was observed experimentally, which says that pesticides may dramatically increase the population of a pest when the pest has a natural predator. Here we use a mathematical model to study the paradox. We find that the timing for the application of pesticides is crucial for the resurgence or non-resurgence of the pests. In particular, regularly applying pesticides is not a good idea as also observed in experiments [3,7]. In fact, the best time to apply pesticides is when the pest population is reasonably high.The paradox of pesticides Pest Predator Pest resurgence Crop’s economic thresholdArticle