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Chemical treatment and sprays

0% of 233 US bed bug populations tested pyrethroid-susceptible in the latest survey. Sourced resistance data on why spray-only treatment so often fails.

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Chemical treatment and sprays
Why does spraying alone so often fail?

Because the pyrethroid-susceptible genotype has essentially disappeared from US bed bug populations. In the most recent nationwide screen — 233 populations across 38 states, tested 2018 to 2019 — the wild-type, pyrethroid-susceptible genotype was not detected in a single one. Not "resistance is rising": it is effectively universal in the populations sampled.

Bed Bugs Answers connects you with licensed local pest control companies. We are not a pest control contractor.

How much resistance are we talking about?

In field populations from Kentucky and Ohio, resistance to deltamethrin measured over 12,765-fold compared to a susceptible strain, and resistance to λ-cyhalothrin measured over 6,123-fold. 88% of 110 sampled US populations carry target-site (kdr) mutations associated with resistance. None of this is new — bed bugs were widely resistant to DDT by the mid-1950s, and pyrethroid resistance reports date to 1958.

Does that mean insecticides never work?

No — carrying resistance-associated mutations is a genotype, not proof that every product fails against every population. But UC IPM's own framing is direct: "insecticide applications alone won't control bed bug infestations," and federal guidance states plainly that some populations "are resistant to almost all pesticides registered to treat them." A licensed applicator selects products and application methods based on this reality, rather than relying on a single spray.

Does that mean insecticides never work?

What about over-the-counter foggers?

Controlled research found field-collected bed bugs showed little to no adverse effect after two hours of direct exposure to three tested over-the-counter total-release foggers. The failure mechanism: brief exposure time, low active-ingredient concentration, no residual activity, and bed bugs sheltering in harborages the mist never reaches — even the susceptible laboratory strain showed dramatically reduced mortality once given access to a hiding place. The researchers' conclusion was direct: foggers "should not be recommended" for bed bug control, a position UC IPM and Cornell both share. EPA is more cautious, saying foggers must not be the sole control method and must be labelled for bed bugs, but agrees they carry real risk if misused.

Sources

5 cited
  1. Nationwide resistance survey: Lewis, Levine, Schal, Vargo & Booth 2023, J. Pest Sci. 96:415–423, doi:10.1007/s10340-022-01505-4 (checked 2026-08-18).
  2. Resistance ratios in Kentucky/Ohio field populations: Romero, Potter, Potter & Haynes 2007, J. Med. Entomol. 44(2):175–178, doi:10.1093/jmedent/44.2.175 (checked 2026-08-18).
  3. kdr mutation prevalence: Zhu, Wigginton, Romero, Moore, Ferguson, Palli, Potter, Haynes & Palli 2010, Arch. Insect Biochem. Physiol. 73(4):245–257 (checked 2026-08-18).
  4. History of resistance: CDC & EPA, Joint Statement on Bed Bug Control in the United States, 2010 (checked 2026-08-18).
  5. Fogger research: Jones & Bryant 2012, J. Econ. Entomol. 105(3):957–963 (checked 2026-08-18); UC IPM Pest Notes Publication 7454, May 2013; US EPA, Should I Use a Fogger?
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  1. 1

    Work out what you have

    Bites with nothing visible, marks on the sheets, and specks along a mattress seam are different findings that point in different directions.

  2. 2

    Tell us what you found

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  3. 3

    See what each method involves

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  4. 4

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Identify before you treat

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Questions

Frequently asked

The questions people actually type at two in the morning.

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Are bed bugs resistant to all pesticides?

Not quite "all," but federal guidance says some populations are resistant to almost all pesticides registered to treat them. Against pyrethroids specifically, the most recent nationwide survey found 0% of 233 tested populations remained susceptible.

Do bug bombs (foggers) kill bed bugs?

Controlled research found little to no effect after two hours of direct exposure to three tested over-the-counter foggers, and the researchers concluded they should not be recommended for bed bug control — a position UC IPM and Cornell both share.

Why does professional chemical treatment work if resistance is so widespread?

Licensed applicators have access to a wider range of active ingredients and application methods, and select and combine them based on the specific population and site — rather than relying on a single consumer spray product against a population that may already carry resistance to it.

What does a kdr mutation actually mean?

It's a target-site mutation in the voltage-gated sodium channel that pyrethroids act on. Carrying it is strongly associated with resistance, but it's a genetic marker, not a direct bioassay result for every specific product — which is why the sourced guidance avoids saying a population is "immune" to insecticides generally.

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