Which of the following would be an example of the IPM practice of cultural controls?

Cultural controls in IPM involve modifying the environment to make it less favorable for pests. Garbage elimination is a cultural control because it removes food sources that attract pests like roaches or flies, as noted in theGeneral Pest Management: Guide for Commercial Applicators - Category 7A(Chapter 4: IPM). Option A (caulking) is a mechanical control, as it physically blocks pest entry. Option B (threshold numbers elevation) refers to monitoring, not a cultural practice.