MDARD Michigan Core Pesticide Applicator Practice Exam

In preventing pest resistance, what is an important action regarding pesticide types?

1. Using only newly developed pesticides

2. Rotating the types of pesticides used

3. Keeping to a single brand

4. Applying the same pesticide for all pests

The correct answer is: Rotating the types of pesticides used

Rotating the types of pesticides used is a crucial strategy in preventing pest resistance. This practice involves alternating between different classes of pesticides that have varying modes of action. By using multiple types of pesticides rather than relying on a single one, pests are less likely to develop resistance. This is because rotating pesticides disrupts the selection pressure that can encourage resistant populations to thrive. When the same pesticide is consistently used, it can lead to pests that survive the application developing resistance, as they are repeatedly exposed to the same chemical compound. In contrast, when different chemicals are used, those that may have developed some level of resistance to one type may still be susceptible to another, thereby maintaining the effectiveness of pest management strategies over time. Additionally, using newly developed pesticides alone may not always provide an effective long-term solution, as even newer products can lead to resistance if not integrated properly into a broader pest management plan. Keeping to a single brand or applying the same pesticide for all pests would further enhance the risk of creating resistant pest populations, as these practices do not introduce sufficient variability in chemical exposure.