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The calendar spraying we saw in simulation 4 is simple, but it is not a good farming practice because the farmer would spray even when population densities are very low. It makes more sense to spray only when it is needed to keep the population below a certain level. That level would of course be a level where the farmer expects the pest to damage his crop. Let's see how the simulation looks when we spray only at a certain threshold level.
This simulation shows maximum 300 days.
The simulation ends when the population size is above 10,000,000 or below 1.
We have seen that it takes quite some frequent pesticide applications to keep a population below a certain level. But there are more ways to manage pest populations. Let's look at the effect of natural enemies and see how they can help keep pest populations under control.
Go to Simulation 6: Introducing biological pest control: a predator.
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