What Do Bug Zappers Actually Kill? It's Not Mosquitoes

That satisfying snap from the bug zapper on the patio? It's almost never a mosquito. When researchers counted every insect six zappers killed over a full summer, only two-tenths of one percent were biting flies — the rest were harmless aquatic insects, natural pest-controllers, and the night-flying moths that pollinate in the dark while we sleep. This episode unpacks why the device is aimed at the wrong target from the start (mosquitoes don't hunt by light — they hunt by the CO₂ and heat your body gives off), what's really dying in that electric grid, and the simpler, cheaper things that actually keep the biters off you. A short, clear look at a familiar summer sound — and the quiet cost of that glowing purple lamp.

www.secretpollinators.com

KEY SOURCES & DOIs

The primary study — non-target kill counts

• • Frick, T. B., & Tallamy, D. W. (1996). Density and diversity of nontarget insects killed by suburban electric insect traps. Entomological News, 107(2), 77–82. — The six-trap, summer-1994 Newark, Delaware study; 13,789 insects killed, 31 biting flies (0.22%), ~48% non-biting aquatic insects, 13.5% predators and parasites.

Mosquito host-seeking cues (CO₂, heat, skin chemistry)

• • Cardé, R. T. (2015). Multi-cue integration: how female mosquitoes locate a human host. Current Biology, 25(18), R793–R795. DOI: 10.1016/j.cub.2015.07.057
  • McMeniman, C. J., Corfas, R. A., Matthews, B. J., Ritchie, S. A., & Vosshall, L. B. (2014). Multimodal integration of carbon dioxide and other sensory cues drives mosquito attraction to humans. Cell, 156(5), 1060–1071. DOI: 10.1016/j.cell.2014.01.044

Nocturnal moth pollination

• • Macgregor, C. J., Pocock, M. J. O., Fox, R., & Evans, D. M. (2015). Pollination by nocturnal Lepidoptera, and the effects of light pollution: a review. Ecological Entomology, 40(3), 187–198. DOI: 10.1111/een.12174
  • Hahn, M., & Brühl, C. A. (2016). The secret pollinators: an overview of moth pollination with a focus on Europe and North America. Arthropod-Plant Interactions, 10(1), 21–28. DOI: 10.1007/s11829-016-9414-3

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