Why do spraying pests with large amounts of pesticides becomes

Question

Why do spraying pests with large amounts of pesticides becomes ineffective over time?this question is part of 4.6 pesticides & fertilizers

John Smith · Accepted Answer

Pests with a natural resistance to the pesticide survive and reproduce, producing more resistant pests in the next generation.

Why do spraying pests with large amounts of pesticides becomes ineffective over time?