Rotating pesticides with different modes of action helps prevent pest adaptation because:

• A. It prevents the pest population from adapting to a single mode of action
• B. It guarantees complete eradication
• C. It reduces the need for IPM
• D. It speeds up kill

Answer: (A)

Rotating pesticides with different modes of action targets resistance management. When a single mode of action is used repeatedly, pests with genetic traits that withstand that action survive and reproduce, so the population becomes more resistant over time. Switching to a different mode of action changes the selective pressure, so those resistant individuals are less likely to survive every time, which slows the spread of resistance and helps keep tools effective longer. Using unrelated modes also reduces the chance that cross-resistance will undermine control. It isn’t a guarantee of eradication, it doesn’t replace the need for integrated pest management, and it doesn’t inherently speed up kill, but it helps maintain long-term control by preventing adaptation to a single action.