Which sampling method involves sweeping a net through vegetation to collect insects?

• A. Beat sheet sampling
• B. Pitfall trap sampling
• C. Sweep net sampling
• D. Visual observation

Answer: (C)

Sweep net sampling involves sweeping a net through vegetation to collect insects. This method targets insects that live on or move through leaves and stems, capturing many foliar-dwelling species by knocking them into the net as you move the net through the plants. You typically use a standardized sweep pattern, height, and number of strokes to make results comparable across sites. This differs from beat sheet sampling, where vegetation is beaten to dislodge insects onto a sheet; pitfall trap sampling, which collects ground-dwelling insects that fall into a buried trap; and visual observation, which relies on sight rather than actively collecting with a net. Sweep netting is great for quick, field-level assessments in grasses and herbaceous vegetation, but may miss very small, deeply concealed, or highly mobile insects and can be influenced by plant density and weather.