DIY Pest Control Effectiveness: What Actually Works (and What Doesn't)

It depends on what you are fighting. Sealing and sanitation, diatomaceous earth in dry cracks, and boric-acid baits used correctly genuinely work on the pests you can reach. Vinegar, essential oils, bleach, coffee grounds and ultrasonic devices mostly stop what you can see without touching the colony. Anything breeding out of sight — termites, rodents in the walls, Argentine ant supercolonies, German cockroaches — is usually beyond DIY.

Vinegar wipes out the scent trail and stops the ants currently marching, but it doesn't kill the colony outside, so more ants keep coming. UC IPM suggests soapy water or window cleaner for the same cleanup, then a slow-acting bait outdoors near the trail and caulk where they enter. It's a cleanup, not a cure.

Yes, within limits. DE kills insects that crawl through it by drying out their shell, so it helps in dry cracks and voids. It stops working when damp and can't reach a colony hidden in a wall or the soil.

They can briefly deter ants or spiders right where you apply them, but the effect fades quickly and won't clear an actual infestation. They're a mild, short-term deterrent at best.

Yes, used correctly, though slowly. UC IPM says boric acid works as a thin film of dust in dry, undisturbed cracks and voids, where it clings to a cockroach's body and is swallowed when the roach grooms itself; it is not repellent, but thick layers cake and clump, and deposits that get wet and cake are not picked up readily. Expect 7 days or more before a significant effect on the population. Keep it away from children and pets, and do not use it outdoors, where UC IPM notes it is toxic to plants.

When the problem keeps coming back, comes from a colony or nest you can't reach, or involves termites or rodents in the structure. Those breed out of sight, and DIY rarely reaches the source.

No, and this is the one where do-it-yourself reliably costs more than it saves. Shelf products reach the surface of the wood, while a drywood colony lives in sealed galleries inside it and a subterranean colony lives in the soil, with only the workers traveling up into your framing. UC IPM says do-it-yourself treatments are not recommended for drywood termites, the products needed to control them are not available for homeowner use, and home-use products are not effective. Spraying what you can see kills foragers and leaves the colony intact, and sweeping up the pellets, knocking down the tubes and patching the kickout holes removes the evidence an inspector reads to locate the activity. California's licensing law exempts owners treating their own property, but anyone you hire to inspect or treat for termites must be licensed by the Structural Pest Control Board. What you can do yourself is the prevention side, so fix leaks, break earth-to-wood contact and keep firewood off the ground.

Borax and boric acid work, but only used the right way and only if you are patient. For ants, UC IPM says a bait must be slow-acting so workers carry it back to the nest before they die, and it recommends liquid borate baits of 0.5 to 1 percent borate in sugar water, in refillable bait stations, for severe Argentine ant infestations. For cockroaches, boric acid works as a thin film of dust in dry, undisturbed voids, where it clings to their bodies and they swallow it while grooming; thick piles cake and clump, and dust that gets wet and cakes is not picked up readily. Keep it away from children and pets. It will not reach termites, which feed inside wood and travel through soil and mud tubes instead of foraging in the open the way ants and roaches do.

No. The popular version of this one says roaches eat baking soda mixed with sugar and it reacts inside them. There is no good evidence for it, and it is not how roach control works. Roaches are cleared with gel baits they actually feed on, growth regulators that stop the next generation, and treatment of the cracks and voids where they harbor. Baking soda is a fine deodorizer for the cabinet you just cleaned out. It is not a treatment.

Sealing and starving the pest, then trapping or baiting it. Caulk, door sweeps, hardware cloth, fixed leaks and sealed food prevent more problems than any spray, and snap traps for rodents and slow-acting baits for ants and roaches handle what is already inside.

In order: identify the pest, take away its food, water and shelter, seal the way in, trap or bait instead of spraying, and use a targeted product only where the pest lives, by the label. That is integrated pest management, the approach the EPA and the University of California recommend.

For a few stray ants or a spider, yes. For pests that breed out of sight, repeated store products often cost more than one visit that finds the source. Our one-time visit prices near Arcadia are published on our pest control cost page.

Stray ants, a spider or two, fruit flies and gnats, pantry moths and the occasional outdoor roach are all realistic do-it-yourself jobs. German cockroaches breeding in a kitchen, rodents in the attic and anything involving termites usually are not.

Not well. UC IPM advises against foggers, bombs and aerosol sprays for cockroaches because they can be hazardous and may repel and scatter roaches to other areas without killing them, and it notes that spraying ants indoors will not stop more ants from coming in. Gel baits in cracks, a thin film of boric acid dust in voids and sealing the entry points do far more.

Expect about a week, not a day. UC IPM says it can take 5 to 10 days to see fewer ants after baiting and 7 days or longer to see fewer cockroaches with gel baits or bait stations, and boric acid dust may take 7 days or more. Keep wiping up ant trails in the meantime, replace baits when they are empty, and move the bait or try a different product if the ants are not taking it.