Oklahoma Applicators License Core Practice Exam

How can pest resistance to pesticides be reduced?

1. By applying the same pesticide repeatedly

2. Through natural pest population growth

3. By rotating different types of pesticides

4. By ignoring pest management strategies

The correct answer is: By rotating different types of pesticides

Rotating different types of pesticides is an effective method for reducing pest resistance because it prevents pests from becoming accustomed to a single chemical. When a certain pesticide is used continuously, it can lead to selection pressure on the pest population, where only those pests with inherent resistance to that specific chemical survive and reproduce. Over time, this can result in an increased population of resistant pests, making the pesticide less effective. By varying the classes of pesticides used, applicators can target different vulnerabilities of the pests, thereby disrupting their life cycles and reducing the likelihood of resistance developing. This strategy is part of an integrated pest management approach that emphasizes diversity and sustainability in pest control practices. It combines chemical methods with biological and cultural controls to promote a healthier ecosystem while effectively managing pest populations.