Bug zappers rarely kill mosquitos — here’s what to use instead by: Christina Marfice, BestReviews Staff. Posted: Jun 16, 2025 / 01:47 PM CDT. Updated: Jun 16, 2025 / 01:47 PM CDT.

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Around the same time, researchers at the University of Delaware used a bug zapper to trap 13,789 insects over a summer.Only 31 — 0.22 percent — were biting insects such as mosquitoes and gnats.