What causes resistance to insecticides in vector populations?

Resistance to insecticides in vector populations is primarily caused by genetic adaptations in surviving populations. When an insecticide is applied, not all pests will be affected equally; some may survive due to natural genetic variations that confer resistance to the specific chemical. These surviving insects then reproduce, passing on their resistant traits to the next generation. Over time, this process leads to a population that is predominantly resistant to the insecticide, making it less effective and necessitating the use of different strategies or products for control.

In addition to genetic factors, factors such as frequent application of the same products may contribute to resistance development, but the underlying mechanism is the genetic adaptation of the survivors. The role of natural predators and improper storage are less directly related to the genetic resistance phenomenon in pest populations.