Which factor is key in the development of pesticide resistance in pests?

The development of pesticide resistance in pests is significantly influenced by the persistence and frequency of pesticide application. When pesticides are applied repeatedly and remain active in the environment for extended periods, it puts constant selective pressure on pest populations. This means that pests that are naturally more resistant to the pesticide survive and reproduce, passing on their resistance genes to future generations. Over time, this can lead to a population that is largely resistant to that specific pesticide, making it less effective in controlling the pest.

Frequent application of a single type of pesticide can accelerate the resistance development process because it creates an opportunity for resistant individuals to reproduce and spread their traits throughout the population. Ideally, implementing an integrated pest management approach that includes rotating different classes of pesticides, along with other control methods, can help reduce the likelihood of resistance developing.