Which strategy is most effective for minimizing resistance in mosquito populations?

Rotating insecticides with different modes of action is an effective strategy for minimizing resistance in mosquito populations because it disrupts the selection pressure that can lead to resistance development. When the same insecticide is used repeatedly, mosquitoes that possess resistance genes can survive and reproduce, thereby increasing the proportion of resistant individuals in the population over time.

By varying the types of insecticides employed, particularly those that act on different biological pathways, the likelihood that a population will develop resistance is significantly reduced. This approach creates an environment where susceptible individuals remain in the population, and it effectively manages pest populations over the long term. Moreover, adopting multiple modes of action can improve overall control efficacy because different insecticides target different physiological processes, making it more challenging for mosquitoes to adapt.

The other strategies, such as applying the same insecticide repeatedly or focusing solely on adulticides, can inadvertently enhance resistance. Applying higher concentrations can temporarily knock down populations but doesn’t address the underlying issue of resistance management. Insecticide rotation, on the other hand, is a proactive and scientifically supported method to maintain effective mosquito control.