What is a common strategy for resistance management in seed treatments?

• A. Apply the same active ingredient every season.
• B. Use products with different modes of action over time, rotate crops, and avoid repeated use of the same active ingredient.
• C. Skip seed treatment for several seasons to reduce selection pressure.
• D. Increase application rates beyond labeled rates to overcome resistance.

Answer: (B)

Rotating products with different modes of action over time and changing crops helps slow resistance development in seed treatments. When the same active ingredient is used repeatedly, pests that tolerate it survive and reproduce, gradually building resistance. Using products that affect pests in different ways disrupts this simple selection, making it harder for resistance to take hold and keeping treatments effective longer. Rotating crops also reduces continuous exposure of pests to the same pest complex and life stage, further limiting selection pressure.

Using the same ingredient every season accelerates resistance because pests constantly face the same pressure, allowing tolerant individuals to dominate. Skipping seed treatment for several seasons lowers immediate chemical exposure but leaves crops vulnerable to pests and doesn’t actively manage resistance. Increasing application rates beyond labeled rates isn’t a valid strategy—it can be unsafe, illegal, and can heighten selection pressure, worsening resistance and other risks. The best approach is to mix in products with different modes of action, rotate crops, and avoid repeated use of the same active ingredient.