Ace the Colorado State Qualified Supervisors Test 2026 – Step Up to Leadership Success!

Blocking pest access with barriers is a physical or mechanical approach because it relies on tangible obstacles to keep pests out, rather than using living organisms, chemicals, or changes in practice. By sealing gaps, installing screens, door sweeps, weather stripping, or fences, you prevent pests from entering the space in the first place. This preventive style contrasts with biological control (which uses natural enemies), chemical control (which uses pesticides), and cultural control (which changes practices or conditions to reduce pest establishment). So barriers fit best as physical or mechanical control.