Crickets can be killed naturally using a handful of methods that don’t involve synthetic chemical pesticides. Diatomaceous earth, entomopathogenic fungi, beneficial nematodes, and simple habitat modifications all have documented effectiveness against various cricket species. Essential oils, while popular, function more as repellents than killers. The best approach depends on whether you’re dealing with a few house crickets chirping in your basement, a yard full of mole crickets tunneling through your lawn, or a seasonal invasion trying to get inside.
Diatomaceous Earth and Desiccant Dusts
Diatomaceous earth is probably the most widely recommended natural cricket killer, and for good reason. It’s a fine powder made from the fossilized remains of tiny aquatic organisms called diatoms. The particles work by physically damaging the waxy outer coating that keeps an insect’s body from losing moisture. Once that protective layer is stripped away, the cricket dries out and dies. This isn’t a chemical reaction; it’s mechanical damage at a microscopic level.
Research on insecticidal dusts has specifically documented their effectiveness against field crickets. In laboratory and field studies using sorptive dusts (a category that includes both diatomaceous earth and synthetic silica aerogels), rapid death from desiccation was achieved with field crickets (Acheta assimilis) along with a range of other arthropods including cockroaches, fleas, mites, and ticks.1Experimental Parasitology. Laboratory and field studies with sorptive dusts for the control of arthropods affecting man and animal The mechanism is consistent across insect species: when the arthropod crawls through the dust, the particles adsorb the lipid layer on the cuticle, and the resulting water loss kills them.2Royal Society of Chemistry. Diatomaceous Earth, A Natural Insecticide for Stored Grain Protection: Recent Progress and Perspectives
For practical use, food-grade diatomaceous earth is what you want. Apply it as a thin, even layer in areas where crickets travel: along baseboards, behind appliances, in garage corners, around foundation cracks, and near entry points. A thick pile is actually less effective because crickets will walk around it rather than through it. The dust works best in dry conditions; moisture clumps the particles and reduces their abrasive action. If you’re using it outdoors, you’ll need to reapply after rain. The main advantage is that it’s nontoxic to mammals and doesn’t break down chemically, so a dry indoor application can remain effective for months.
Essential Oils Work as Repellents, Not Killers
Essential oils get a lot of attention as “natural cricket killers,” but the evidence points more toward repellency than lethality. A study testing a range of essential oils against house crickets (Acheta domesticus) found that roughly half of the oils tested triggered strong repellent behavior. The four strongest performers were peppermint, rosemary, cinnamon, and lemongrass, all of which showed a clear dose-dependent effect: higher concentrations repelled more effectively.3PubMed Central. Selected Essential Oils Act as Repellents Against the House Cricket, Acheta domesticus
The repellency rankings are worth knowing if you’re trying this approach. In order from strongest to weakest repellent effect, the oils that performed well were sage, peppermint, wintergreen, basil, rosemary, cinnamon, tea tree, bergamot, citronella, juniper berry, lemongrass, lemon eucalyptus, lavender, and lemon.3PubMed Central. Selected Essential Oils Act as Repellents Against the House Cricket, Acheta domesticus An interesting finding from the same research: standard synthetic insect repellents like DEET and IR3535, which work well against mosquitoes, produced no significant repellent response in crickets. So if you’ve tried a DEET-based spray and wondered why it didn’t keep crickets away, there’s your answer.
The practical takeaway is that essential oils are better suited for keeping crickets out of a space than for eliminating an existing population. Spraying diluted peppermint or cinnamon oil around doorways, window frames, and basement vents may discourage crickets from entering. But once they’re already inside and established, repelling them isn’t the same as killing them. Think of essential oils as part of a prevention strategy rather than a solution to an active infestation.
Entomopathogenic Fungi
If the phrase “entomopathogenic fungi” sounds like science fiction, the concept is straightforward: certain naturally occurring fungi infect and kill insects. Two species in particular, Beauveria bassiana and Metarhizium brunneum, have been studied as biological control agents against crickets and their close relatives. Both are commercially available as biopesticides.
In field cage trials against Mormon crickets (a large species in the same insect order as house and field crickets), both fungi were applied as simulated aerial sprays. Under controlled laboratory conditions after field exposure, these fungi caused 90 to 100 percent mortality within 12 days, with the first deaths appearing around day 5 or 6.4Biocontrol Science and Technology. Simulated aerial sprays for field cage evaluation of Beauveria bassiana and Metarhizium brunneum against Anabrus simplex in Montana That’s a high kill rate, but there’s a catch: in the open field, mortality was lower because high ambient temperatures and the crickets’ own body-heat regulation pushed conditions beyond the fungi’s upper thermal limits.4Biocontrol Science and Technology. Simulated aerial sprays for field cage evaluation of Beauveria bassiana and Metarhizium brunneum against Anabrus simplex in Montana
For home and garden use, Beauveria bassiana is the more commonly available option, sold under various brand names as a spray or granular product. It works best in moderate temperatures and humid conditions. If you’re applying it outdoors on a blistering hot day, you’re working against the biology of the fungus. Evening or early morning applications in temperate weather give the spores the best chance to germinate and infect. The fungus doesn’t kill on contact; expect a lag of several days to a couple of weeks before you see results. It’s also worth knowing that these fungi are generally safe for mammals, birds, and most beneficial insects, though you should avoid applying them directly to flowering plants when pollinators are active.
Beneficial Nematodes for Mole Crickets
Mole crickets are a different animal from the house crickets chirping behind your refrigerator. They live underground, tunneling through soil and feeding on grass roots, and they can devastate lawns, pastures, and turf. If mole crickets are your problem, beneficial nematodes are the most proven natural control method.
Entomopathogenic nematodes are microscopic worms that seek out soil-dwelling insect larvae, enter their bodies, and release bacteria that kill the host within a day or two. Commercially produced nematodes are already in widespread use for mole cricket control in lawns and turf, along with other soil pests like scarab grubs and fungus gnats.5PubMed Central. Entomopathogenic nematodes for control of insect pests above and below ground with comments on commercial production The species most commonly used against mole crickets is Steinernema scapterisci, which was originally brought to the United States from South America specifically to target invasive mole crickets in the southeastern states.
Timing matters with nematode applications. The nematodes need to encounter active mole crickets in the soil, so you want to apply them when the crickets are feeding near the surface rather than deep underground. University of Florida research has provided detailed guidance on matching nematode applications to mole cricket activity patterns on pasture and turfgrass.6EDIS. Timing the Application of Beneficial Nematodes to Mole Cricket Activity on Pasture to Optimize Control In most southeastern climates, late summer through early fall is the prime window, when young mole crickets are small and near the surface. You mix the nematodes into water and apply them with a hose-end sprayer or watering can, then irrigate the lawn to wash them into the soil. The soil should stay moist for a few days afterward to keep the nematodes alive and mobile.
One major advantage of nematodes is that they establish themselves in the soil and can continue reproducing and killing mole crickets for years after a single application, effectively becoming a self-sustaining biological control. The downside is that they don’t work instantly and won’t help with crickets that are inside your home.
Habitat Modifications That Actually Reduce Cricket Numbers
Killing crickets one method at a time is less efficient than making your property inhospitable to them in the first place. Crickets are attracted to three things: moisture, shelter, and light. Addressing all three can dramatically reduce how many crickets you’re dealing with.
Moisture is the big one. Crickets need damp environments to survive and breed. Fix leaky outdoor faucets, improve drainage around your foundation, and clear clogged gutters. Inside, address any damp basements or crawl spaces with dehumidifiers or improved ventilation. A dry environment is already working against crickets before you apply anything else.
Shelter means the places crickets hide during the day: piles of wood, stacked bricks, leaf litter against the foundation, dense ground cover, and cluttered garages or sheds. Moving firewood at least six meters from your house, raking mulch back from the foundation, and clearing debris from around entry points removes the staging areas that crickets use to launch their nightly forays indoors.
Outdoor lighting deserves special attention because it’s one of the biggest attractants people overlook. Most crickets are strongly drawn to white and blue-spectrum lights. Switching exterior lights to warm-toned yellow or amber bulbs, or to sodium vapor fixtures, significantly reduces the number of flying and jumping insects that congregate near your doors and windows at night. If you can relocate fixtures so they illuminate from a distance rather than mounting them right next to doorways, even better. The goal is to stop attracting crickets to the exact spots where they’re most likely to find a gap and get inside.
Sealing entry points sounds obvious, but it’s often the difference between “a few crickets outside” and “crickets in every room.” They can squeeze through surprisingly small gaps around pipes, utility conduits, door sweeps, and window frames. Caulk, expanding foam, and weatherstripping are your tools here. Pay extra attention to the ground-level gaps where plumbing and electrical lines enter your home.
Soapy Water and Other Home Remedies
A shallow dish of soapy water placed near a light source at night will catch and drown crickets. The soap breaks the surface tension so they can’t float. This is genuinely effective as a trapping method for small numbers of crickets. It won’t control a large outdoor population, but for a few crickets that have gotten inside, it works overnight with zero toxicity concerns.
Sticky traps (glue boards) placed along walls and in corners where crickets travel will also catch them. These are useful for monitoring how many crickets you have and where they’re moving, in addition to reducing numbers directly. Some people bait sticky traps with a small piece of bread or a drop of molasses to increase capture rates.
Boric acid is sometimes listed alongside natural remedies. It is naturally derived and low in toxicity to mammals, but it’s worth distinguishing from truly inert substances like diatomaceous earth. Boric acid works both as a stomach poison when crickets groom it off their bodies and as a desiccant. It’s effective, but it should be kept away from areas where children or pets might contact it, and it’s toxic to plants if applied to soil. Used carefully in cracks, voids, and behind baseboards, it’s a reasonable addition to a low-toxicity approach.
Do Ultrasonic Devices Keep Crickets Away?
Ultrasonic pest repellers are marketed as a hands-off, chemical-free way to drive insects and rodents out of your home. The idea is that high-frequency sound waves create an environment insects find intolerable. For crickets specifically, the picture is mixed and leans toward disappointing.
There is some scientific basis for the concept when it comes to certain night-flying insects. Some moths and other nocturnal flyers have evolved to detect and flee from the ultrasonic calls of bats, so broadcasting bat-like sounds can disrupt their behavior. However, a review of acoustic applications in insect pest management noted that ultrasonic signals have little effect on insects that are not normally preyed upon by bats.7CABI Reviews. Applications of acoustics in insect pest management House crickets and field crickets don’t fly at night in the way that moths do, and their primary acoustic world revolves around their own chirping frequencies, which are well below the ultrasonic range. The consumer devices that plug into a wall outlet and claim to repel “all pests” are, for crickets at least, unlikely to deliver meaningful results.
Matching the Method to the Cricket
Not all cricket problems are the same, and the species matters more than people realize. House crickets (Acheta domesticus) are the ones that get inside, chirp loudly at night, and chew on fabrics, paper, and food scraps. They’re the species most people are trying to deal with. For these, diatomaceous earth in indoor hiding spots, essential oil repellents at entry points, soapy water traps, and sealing gaps are the best natural combination.
Field crickets (various Gryllus species) live primarily outdoors but migrate toward buildings in late summer and fall, often in large numbers drawn by lights. Habitat management and lighting changes are critical for these seasonal invasions because no amount of indoor treatment will stop thousands of crickets from approaching a brightly lit building. Reducing exterior light attraction and sealing the building envelope are the first priorities; diatomaceous earth and traps handle the ones that get through.
Camel crickets (Ceuthophilus species) are the humpbacked, silent ones that colonize basements and crawl spaces. They don’t chirp, but they can appear in startling numbers in damp environments. Because moisture is what draws them, dehumidification is often more effective than any insecticide. Get the relative humidity in your basement below about 60 percent and camel crickets lose interest. Sticky traps placed along basement walls will catch stragglers.
Mole crickets (Neoscapteriscus species in the southeastern United States) are an entirely outdoor, below-ground problem. They rarely enter homes. As discussed earlier, beneficial nematodes are the gold-standard natural control for these, applied to turf during the right seasonal window. Entomopathogenic fungi can also help, particularly in cooler weather when the fungal spores thrive.
Why Crickets Show Up in the First Place
Understanding what drives cricket activity helps explain why they seem to appear suddenly and in waves. Most cricket species in temperate climates have a single generation per year. Eggs laid in soil in the fall hatch in spring, and the nymphs grow through the summer. By late summer and early fall, you have a peak population of full-grown adults looking for mates, food, and shelter as nighttime temperatures drop. This is when the annual “cricket invasion” happens around homes and commercial buildings.
Warm, dry summers tend to produce larger cricket populations because survival rates are higher and development is faster. Irrigated lawns surrounded by dry landscaping can concentrate crickets near homes, since your watered grass is the most hospitable habitat in the neighborhood. Compost piles, garden beds with heavy mulch, and pet food left outdoors all provide food sources that keep cricket populations healthy and close to your house.
Crickets are omnivores with broad diets. Outdoors they eat decaying plant material, fungi, seedlings, and other insects. Indoors they’ll feed on crumbs, pet food, cardboard, wool, silk, and even other dead crickets. Removing food sources won’t eliminate them entirely, but it reduces the incentive for them to stay once they’ve entered. Keeping food in sealed containers, vacuuming regularly, and not leaving pet food bowls out overnight are simple steps that make your home a less appealing destination.
One nuance worth mentioning: crickets are actually beneficial in most outdoor contexts. They break down organic matter, aerate soil, and serve as food for birds, frogs, lizards, and spiders. The goal for most people isn’t to eradicate every cricket on the property but rather to keep them outside and at tolerable numbers. A few crickets in the yard are part of a healthy ecosystem. A hundred crickets in your garage are a problem worth solving, but the natural methods described above can handle it without collateral damage to the broader insect community around your home.