Sealing cracks and crevices and small openings in buildings is an example of which type of mechanical control method?

• A. Psychical
• B. Genetic
• C. Biological
• D. Cultural

Answer: (A)

Sealing cracks and crevices is a physical exclusion technique—a mechanical control method that blocks pests from entering the building. By creating barriers, you prevent access routes, so insects and rodents can’t get inside, which reduces infestation risk without using chemicals or relying on natural enemies. This is not about altering pest genetics, introducing biological agents, or changing human practices to reduce pest pressure, so it fits best as a mechanical (physical) control. In practice, caulking gaps, sealing foundation joints, and weather-stripping doors are classic examples of this approach working to protect the structure.