How can you implement resistance management within a pesticide program?

• A. Increase frequency of same product to build resistance
• B. Rotate active ingredients with different modes of action; use threshold-based IPM; avoid repeated use of the same product; integrate non-chemical controls.
• C. Use only one mode of action across all crops
• D. Avoid non-chemical controls

Answer: (A)

The main idea is to slow or prevent pest resistance by reducing consistent exposure to any single pesticide mechanism. To do this effectively, you rotate active ingredients that have different modes of action so pests aren’t repeatedly exposed to the same biological target. This makes it harder for resistance to build in the population because different mechanisms stress pests in different ways.

Pairing that rotation with threshold-based IPM means you only spray when pest levels actually justify treatment, not on a fixed schedule. This lowers overall pesticide use and the selection pressure that drives resistance. Adding non-chemical controls—like cultural practices, biological controls, and mechanical methods—keeps pest pressure down without relying solely on chemicals, further reducing the chance pests adapt to one tool.

So the best approach combines rotating diverse modes of action, applying treatments based on monitoring thresholds, and integrating non-chemical methods. Increasing how often you use the same product would push pests toward resistance, using only one mode of action across crops concentrates selection pressure, and excluding non-chemical controls misses valuable tools that lessen reliance on pesticides.