Virginia Commercial Pesticide Applicators CORE Exam

Which is a technique to help limit pesticide resistance?

1. Applying the same pesticide consistently

2. Using non-targeted chemical control methods

3. Rotating modes of action among pesticides

4. Reducing water usage during application

The correct answer is: Rotating modes of action among pesticides

Rotating modes of action among pesticides is an effective technique to help limit pesticide resistance because it reduces the selection pressure on pest populations. When a single mode of action is used repeatedly, pests can gradually develop resistance to that particular chemical. By alternating between different pesticide classes with distinct modes of action, you disrupt the pests' ability to adapt and develop resistance. This strategy not only prolongs the efficacy of the pesticides being used but also contributes to better integrated pest management practices. In contrast, consistently applying the same pesticide can lead to heightened resistance among pest populations because they are repeatedly exposed to the same chemical. Non-targeted chemical control methods might affect beneficial organisms and disrupt the ecosystem balance, and while reducing water usage during application can be beneficial for environmental conservation, it does not have a direct impact on pesticide resistance. Therefore, rotating modes of action stands out as the most effective and sustainable approach in managing pesticide resistance.