Associate Certified Entomologist (ACE) Practice Exam

What is the recommended method for applying pesticides to avoid resistance development?

1. At reduced rates

2. At the label rate

3. Only when pests are visible

4. By mixing with other chemicals

The correct answer is: At the label rate

Applying pesticides at the label rate is the recommended method for avoiding resistance development. This practice is critical because the label rate is established through rigorous testing and reflects the optimal concentration and application method to achieve effective pest control while minimizing the risk of both resistance and non-target effects. Using the pesticide as labeled assures that pests are exposed to a sufficient dose that can effectively manage their populations, reducing the likelihood that individuals will survive and develop resistance mechanisms. This means that the pressure exerted on pest populations is consistent, and over time, susceptible pests are eliminated while resistant ones do not thrive due to insufficient amounts of the pesticide. Adhering to the label also ensures compliance with legal and safety standards, promoting responsible chemical use. In contrast, applying pesticides at reduced rates or mixing them with other chemicals may not provide effective control and could lead to sub-lethal exposures, which are risk factors for resistance development. Additionally, only applying treatments when pests are visible might allow populations to establish and increase, which can also foster resistance in surviving individuals.