The most effective earwig killer depends on whether you’re dealing with a few stragglers indoors or a full invasion in your garden. For fast, broad knockdown, granular or spray insecticides containing bifenthrin work well around your home’s perimeter. For targeted control without chemicals, a simple soy sauce and oil trap can fill up with dozens of earwigs overnight. Most people get the best results by combining a couple of methods, since earwigs are nocturnal and hide in damp, tight spaces during the day where a single approach can’t always reach them.
Perimeter Sprays and Granules
Bifenthrin is one of the most widely used active ingredients for earwig control. It belongs to the pyrethroid family, a group of synthetic insecticides modeled after compounds naturally found in chrysanthemum flowers. It works by disrupting the nervous system of insects on contact or ingestion, and it’s far more toxic to insects than to people because of their smaller body size and lower body temperature. Over 600 products containing bifenthrin are sold in the United States, available as sprays, granules, and aerosols.
Granular formulations are especially useful for earwigs. You scatter them around the foundation of your home and near garden beds where earwigs are active. Spray versions let you treat cracks along the foundation, door thresholds, and window frames where earwigs squeeze inside. For either format, apply before earwig numbers build up rather than waiting until you’re seeing them every night.
If you have pets or children, timing matters. EPA label instructions for bifenthrin products require that people and pets stay off treated surfaces until the spray has fully dried. Plan for a minimum of four hours of dry weather after application, and remove pets, birds, and fish tanks from the area before you spray indoors. Never apply the product directly to animals.
The Soy Sauce and Oil Trap
This is the best low-cost, chemical-free option, and it works surprisingly well. Earwigs are attracted to the smell of soy sauce. The trap uses it as bait, then drowns them in water topped with a thin layer of vegetable oil that prevents escape. Here’s how to set one up:
- Container: Use any small, reasonably deep vessel: a yogurt cup, tuna tin, small jar, or large pill bottle.
- Fill it: Add water to about one-third full, then stir in two tablespoons of soy sauce. Pour in just enough vegetable oil (any kind) to form a thin layer across the surface.
- Bury it: Sink the container into the soil so the rim sits just slightly above ground level. This keeps dirt from falling in and clogging the trap.
- Cover it: Set a larger lid or plastic saucer on top, propped up on four small stones. The cover protects the trap from rain while leaving a gap around the edges for earwigs to crawl under.
- Wait: Leave the trap in place for a few days. Earwigs come out to feed at night, find the soy sauce scent, and fall in. Dump the contents into compost and refill.
Place traps near woodpiles, rock borders, garden debris, or beds with young seedlings, all spots where earwigs congregate during the day. A handful of traps spread across a garden can make a noticeable dent in the population within a week.
Diatomaceous Earth
Food-grade diatomaceous earth is a fine powder made from fossilized algae. It kills earwigs mechanically rather than chemically: the microscopic particles cut into and absorb the thin waxy coating on an insect’s body, causing it to dehydrate and die. It’s not harmful to pets or people, which makes it a good choice for gardens, raised beds, and areas near doorways.
Sprinkle a light, visible line of it around the base of plants earwigs are damaging, or along foundation edges where they enter the house. The main limitation is moisture. Once diatomaceous earth gets wet, it clumps together and stops working. You’ll need to reapply after rain or irrigation. In dry climates or covered areas like porches and crawl spaces, it lasts much longer.
Reducing Earwig Habitat Around Your Home
Earwigs need two things: moisture and shelter. Removing those around your home’s perimeter is one of the most effective long-term strategies, and it makes every other method work better.
Start by clearing anything that creates damp, dark hiding spots near your foundation. That means pulling back bark mulch, leaf litter, ground cover plants, and ivy growing up walls. Move woodpiles, stacked newspapers, and piled garden debris away from the house. Clean leaves out of gutters, since clogged gutters create the exact combination of moisture and organic matter earwigs love.
Next, address moisture itself. Repair leaking drain spouts, grade the soil so water flows away from the foundation rather than pooling against it, and ventilate crawl spaces to keep humidity low. If you’re watering garden beds right next to the house every evening, you’re essentially rolling out a welcome mat for earwigs.
Finally, inspect the places where earwigs are getting indoors and seal them. Check for gaps around door sweeps, cracks in the foundation, spaces where utility pipes enter the wall, and poorly fitted window frames. A tube of exterior caulk can close most of these entry points in an afternoon.
Combining Methods for Best Results
No single product eliminates earwigs completely, because their hiding behavior during the day means many individuals never contact a spray or walk through a powder line. The most reliable approach layers a few compatible tactics. A practical combination looks like this: clear debris and mulch from around the foundation, apply a granular bifenthrin barrier or dust diatomaceous earth along the perimeter, set a few soy sauce traps in the garden beds where damage is worst, and seal any cracks where earwigs enter the house.
Traps and habitat cleanup are the core of the strategy. Chemical treatments add speed and broader coverage when populations are high. If you’re only seeing the occasional earwig indoors, cleaning up the perimeter and setting a couple of traps may be all you need. If you’re finding clusters of them every morning under pots, in the garage, or chewing through seedlings, adding a perimeter spray or granule gives you faster knockdown while the traps and habitat changes take hold.