The point of the excerpts was that different levels of pesticides can have quite opposite effects and that a certain level of the pest may be required in order to manage resistance in the pest. In other words, we need to go beyond pest management to resistance management. It's hard to make this simple, thanks for those who are trying to help.

> Resistance depends on a certain abundance and mobility of susceptible insects in a system. Occasionally, the densities of pests needed to secure resistance management are above economic thresholds established under IPM.

Pete
references available on request

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