Why is rotating pesticides with different modes of action important in IPM?

• A. To degrade crops' quality.
• B. To delay or prevent pest resistance by avoiding repeated use of products with the same MOA.
• C. To comply with waste disposal rules.
• D. To increase the speed of application.

Answer: (C)

Rotating pesticides with different modes of action is a resistance-management practice in IPM. When the same mode of action is used repeatedly, pests that happen to have or develop resistance survive each treatment and pass those traits to their offspring, gradually making that MOA less effective. Using products from different MOA groups interrupts this selection process, so no single resistance mechanism can spread quickly through the pest population. This helps keep pest control effective over time and is a key part of integrated pest management alongside monitoring and other non-chemical controls. The other options don’t address resistance management—rotation isn’t about crop quality, waste disposal rules, or simply speeding up application.