To minimize resistance development in turf pests, what strategy should you use?

• A. Apply only at night to avoid pollinators.
• B. Rotate pesticides with different modes of action and implement IPM strategies.
• C. Apply at reduced rates during bloom.
• D. Ignore the prohibition if pests are severe.

Answer: (B)

Resistance management hinges on use of pesticides with different modes of action and an IPM approach. Using the same mode of action repeatedly creates a strong selection pressure that lets resistant individuals survive and propagate, making the pest harder to control over time. By rotating pesticides with different modes of action, you spread that pressure across several mechanisms, making it much harder for pests to adapt.

Incorporating IPM means not relying solely on chemistry but combining regular scouting, action thresholds, cultural practices, and biological options to keep pest populations in check with fewer chemical inputs. This combination slows the buildup of resistance and helps maintain long-term turf health and control effectiveness.

Choices that focus only on protecting pollinators, or applying at reduced rates, or ignoring label restrictions don’t address resistance. Sublethal exposure and improper rates can actually promote resistance and other problems, even if they reduce pollinator contact in the short term.