Before modern pest control existed, people fought bed bugs with everything from poisonous mercury to bean leaves to burning sulfur. Some methods were surprisingly clever, others were genuinely dangerous, and a few actually worked well enough to survive in some form today. The full history stretches from ancient folk remedies through the chemical revolution of the 20th century.
Bean Leaves: The Eastern European Trap
One of the most ingenious old methods came from Eastern Europe, where people scattered kidney bean leaves on the floor around their beds at night. In the morning, the leaves would be covered with trapped bed bugs and could simply be gathered up and burned. This wasn’t superstition. Researchers at the University of California, Irvine later confirmed the mechanism using electron microscopy: the leaves are covered in tiny hooked hairs called trichomes that physically impale the insects’ feet as they walk across the surface. The hooks work less like Velcro and more like barbless fishhooks, piercing through the outer shell of the bug’s leg and pinning it in place.
Every trapped bug examined had at least one leg punctured by a trichome. Once pierced, the bugs visibly struggled but could not pull free. This was a purely mechanical trap, no chemicals involved, and it was effective enough to remain a common household practice for generations across the Balkans and surrounding regions.
Mercury, Arsenic, and Other Poisons
Chemical warfare against bed bugs goes back centuries, and the early weapons were terrifyingly toxic to people as well as insects. As early as 1735, a mixture of mercury and egg white was recommended for bed bug control. The mercury paste was brushed into cracks and crevices where bugs hid during the day. By the 1800s and early 1900s, the standard chemical arsenal included mercury chloride, arsenic dust, kerosene, gasoline, turpentine, and benzene, all either painted onto bed frames and walls or applied as sprays.
These chemicals had serious limitations. The sprays only killed bugs on direct contact, which meant they worked best against small, early-stage infestations. Bugs hiding deep in wall cavities or behind plaster often survived. More importantly, mercury chloride and arsenic were implicated in several human deaths. People were essentially poisoning their own bedrooms in hopes of poisoning the bugs first.
Sulfur Fumigation
Burning sulfur was the first fumigant widely used against bed bugs, and it was far more effective than sprays because the toxic fumes could reach insects hidden in places a brush or rag never could. The standard approach involved dipping candles or sticks in sulfur, lighting them inside the infested room, and sealing the doors and windows to let the fumes penetrate every crack. Sulfur fumigation could kill bed bugs at all life stages, including eggs, which most contact sprays could not.
The obvious downside: sulfur dioxide gas is dangerous to breathe, corrosive to metals, and the process required everyone to vacate the home. Another fumigant, heavy naphtha (a vapor derived from coal tar), also proved effective at killing bed bugs but never caught on widely because it was highly flammable. Setting your house on fire to kill bed bugs was a real risk with several of these early methods.
Pyrethrum Powder: A Safer Alternative
By the mid-1800s, a product called Keating’s Powder became widely sold across Europe and the United States. It was made from pyrethrum, a natural insecticide extracted from chrysanthemum flowers. Pyrethrum was far less toxic to humans than mercury or arsenic, and it became one of the first commercially marketed pest control products. Advertisements for chemical bed bug treatments had appeared as early as the 1730s, including one called “nonpareil liquor” that may have been derived from quassia wood, but pyrethrum powder was the first to achieve mass-market success.
Pyrethrum worked on contact and broke down quickly in the environment, which made it safer but also meant it had no lasting residual effect. You had to keep reapplying it. Still, it represented a meaningful step toward pest control that didn’t also risk killing the homeowner.
Heat, Boiling Water, and Manual Removal
Before any of these chemicals were available, the most basic approach was physical. People poured boiling water over bed frames and into cracks in walls. Mattresses and bedding were dragged outside on hot summer days or placed near fires. In cold climates, some families would leave windows open during deep winter freezes in an attempt to kill bugs through cold exposure, though bed bugs can survive surprisingly low temperatures for short periods.
Meticulous housekeeping was the other frontline defense. Bed frames were regularly taken apart and inspected. Crevices were scraped clean. Whitewash was applied to walls partly because the light color made it easier to spot bugs and partly because the lime in the wash may have had some repellent effect. None of this was easy, and none of it was reliably effective against established infestations. Bed bugs were simply a fact of life for most people throughout history.
DDT Changed Everything
The real turning point came during World War II. Beginning in 1942, DDT was heavily used to control bed bug infestations in military barracks. It was cheap, easy to apply, and devastatingly effective. Unlike the old sprays that required direct contact, DDT left a long-lasting residue that continued killing bugs for weeks or months after application. For the first time, a single treatment could wipe out an entire infestation.
The impact was dramatic. Bed bugs, which had been a universal nuisance across the developed world, became genuinely uncommon by the 1960s and 1970s. An entire generation grew up barely knowing what a bed bug was. But the story wasn’t quite that simple. The first reports of DDT-resistant bed bugs appeared as early as 1947, from a naval station at Pearl Harbor. By the 1950s, resistance to DDT was widespread. Bed bug populations declined anyway during this period, likely because DDT was used so heavily and in combination with other chemicals that even resistant populations were suppressed.
DDT was eventually banned in many countries during the 1970s due to its environmental effects, particularly its impact on bird populations. Other synthetic insecticides replaced it, but over the following decades, bed bugs slowly developed resistance to those as well. The global resurgence of bed bugs that began in the late 1990s is partly a story of insects that evolved their way past every chemical we threw at them, bringing the problem full circle to an era where heat treatment, one of the oldest approaches, has become a primary professional method once again.