North Carolina Pesticide Application Practice Test

Which method can enhance pesticide efficacy while reducing resistance development?

1. Mixing multiple pesticides together

2. Rotating between pesticide types

3. Increasing application frequency

4. Using high dosages for all applications

The correct answer is: Rotating between pesticide types

Rotating between pesticide types is a highly effective method for enhancing pesticide efficacy while simultaneously reducing the likelihood of resistance development. This practice involves alternating the use of different pesticides that have unique modes of action. By doing so, it prevents pests from becoming accustomed to a single pesticide, which can lead to resistance over time. When pests are exposed to diverse chemical families, they are less likely to develop resistance, as their survival rates decrease due to the differing mechanisms of action. Incorporating rotation into pest management strategies allows for continued effectiveness of the pesticides being used, as it disrupts the pests' ability to adapt to a single chemical. This approach is supported by Integrated Pest Management (IPM) principles, which advocate for the use of various control methods to sustainably manage pest populations. Other methods mentioned may pose risks. Mixing multiple pesticides can sometimes enhance efficacy, but it also risks the development of cross-resistance if pests encounter similar modes of action within the mixtures. Increasing application frequency can lead to greater selection pressure on pest populations, increasing the chances of resistance. Using high dosages can initially seem effective, but it can also foster resistance and harm non-target organisms, making it less desirable for long-term pest management.