Which practice helps avoid pesticide resistance?

Which practice helps avoid pesticide resistance?

• A. Use IPM
• B. Rotate or tank-mix pesticide modes and sites of action
• C. Run exposure tests on pests
• D. Never rotate products and use maximum label rate

Answer: (B)

Pesticide resistance develops when pests that can survive a treatment pass those traits to their offspring, so repeated use of products that work the same way creates strong selection for resistant individuals. The most effective way to slow or avoid this is to vary how you attack the pest across applications. Rotating modes of action means using products that affect the pest in different ways (different sites of action) over time. This makes it harder for a pest population to build resistance because it would need multiple, independent traits to survive successive treatments. Tank-mixing—combining two products with different modes of action in a single application—adds immediate diversity in the pest’s exposed vulnerabilities, further reducing the chances that survivors will carry resistance to all active ingredients. When doing this, it’s important that the products are labeled for the target pest and are physically compatible, and that you manage timing and rates to maintain effectiveness and resistance management. IPM supports resistance management as part of a broader strategy, but the specific practice of rotating modes of action or using tank mixes directly addresses how resistance develops. In contrast, running exposure tests on pests doesn’t prevent resistance from forming, and never rotating products while using maximum label rates increases the selection pressure that drives resistance.

Pesticide resistance develops when pests that can survive a treatment pass those traits to their offspring, so repeated use of products that work the same way creates strong selection for resistant individuals. The most effective way to slow or avoid this is to vary how you attack the pest across applications.

Rotating modes of action means using products that affect the pest in different ways (different sites of action) over time. This makes it harder for a pest population to build resistance because it would need multiple, independent traits to survive successive treatments. Tank-mixing—combining two products with different modes of action in a single application—adds immediate diversity in the pest’s exposed vulnerabilities, further reducing the chances that survivors will carry resistance to all active ingredients. When doing this, it’s important that the products are labeled for the target pest and are physically compatible, and that you manage timing and rates to maintain effectiveness and resistance management.

IPM supports resistance management as part of a broader strategy, but the specific practice of rotating modes of action or using tank mixes directly addresses how resistance develops. In contrast, running exposure tests on pests doesn’t prevent resistance from forming, and never rotating products while using maximum label rates increases the selection pressure that drives resistance.