The insects become resistant and are able to survive to reproduce and create a population that is also resistant.
Hence, after a point where the population survives pesticides and become resistant to it, it will reach its pretreatment population.
How do insects become resistant to pesticides over time?
- Spraying the same pesticide often enables pests to develop resistant genes which enable them to survive.
- Insects without resistance genes die when exposed to insecticides, allowing individuals with resistance genes to survive and breed, resulting in more resistant insects.
- The number of resistant insects grows with each generation. Hence the pesticide often becomes ineffective over time.
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