Pest resurgence and Pest replacement

Pest resurgence is observed when pests previously targeted and successfully controlled by pesticide recur, but in higher numbers than they did before. The reason for this is the removal of predators together with pests. They either die from the pesticide, or move away because their food source has disappeared.

In nature, pest populations are balanced by the relationship between predators and pests. If predators are removed from or migrate away from a particular environment, opportunistic pest species are able to breed unchecked. It is virtually impossible to annihilate an entire pest population from an area. Survivors may be safe in areas not covered by the _____ _____ ____ ___ ______ ______ ___ ___ ________ ____ ________.
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