What is a key benefit of rotating pesticides with different MOAs?

• A. It reduces application costs.
• B. It ensures the same pesticide is used every time.
• C. It delays resistance by avoiding repeated MOA.
• D. It eliminates the need for monitoring.

Answer: (C)

Rotating pesticides with different modes of action helps manage resistance by preventing pests from adapting to a single mechanism. When a pest population is consistently exposed to the same MOA, individuals with resistance survive and reproduce, quickly making that pesticide ineffective. By switching to products with another MOA, the selective pressure on any one resistance trait is reduced, slowing the overall development of resistance. This approach also helps avoid cross-resistance among related chemicals. So the key benefit is delaying resistance by avoiding repeated MOA exposure. The other ideas don’t fit as well: using the same pesticide every time would accelerate resistance, rotation isn’t primarily about cutting costs, and monitoring is still needed even with rotation.