HARRIS Boric Acid Roach and Silverfish Killer Powder w/Lure for Insects (16oz)

Targeting stubborn insect infestations behind walls and appliances requires a product that reaches deep into nesting sites, which is where HARRIS Boric Acid Roach and Silverfish Killer Powder excels. This dry treatment tackles roaches, palmetto bugs, water bugs, and silverfish by combining an active mineral dust with an attractive bait. Packaged in a 16-ounce container, it provides homeowners with a straightforward way to address pests hiding out of plain view.

A notable advantage of this formula is the inclusion of a food-grade lure blended right into the powder. Pests naturally seek out shelter and rarely venture into open spaces, but the integrated lure works to attract roaches out of tight cracks and voids. Once the target pests leave their nesting spots to investigate, they pick up the fine dust on their bodies.

The application method is built directly into the packaging via a puffer bottle design. This dispenser allows you to puff precise clouds of dust into difficult-to-reach areas, such as the narrow gaps under sinks, baseboards, and kitchen equipment. The formula provides long-lasting protection that continues working for weeks after application, provided the powder is kept dry, and contact with the dust ensures insects will die within 72 hours.

Because the product is a powder, moisture is its primary vulnerability. The treatment remains active only as long as it stays completely dry, meaning areas subject to plumbing leaks or heavy standing water will neutralize its effectiveness and require reapplication. Additionally, because it takes up to 72 hours to eliminate insects after initial contact, it does not provide instant knockdown on active bugs that you see scurrying across a floor.

Verdict: For homeowners needing a dependable, targeted method to draw out and control roaches, palmetto bugs, and silverfish from hidden recesses, this powder is a practical choice. Those who need instant, contact-spray knockdown or who are treating persistently damp spaces should consider liquid or moisture-resistant alternatives.

A great fit if you:

• Need to draw roaches out from concealed spaces using a built-in food-grade bait rather than relying on chance contact.
• Want an EPA-registered formula made in the USA that is designated for use in households shared with people and pets.
• Have infestations located in dry crevices, behind cabinets, or under appliances where a directional puffer bottle makes dusting simple.
• Are dealing with recurring invasions of roaches, palmetto bugs, water bugs, or silverfish that require residual control for weeks.

Consider something else if you:

• Need an instant-kill contact spray to immediately drop visible bugs crawling in open spaces.
• Are treating damp outdoor locations, active plumbing leaks, or humid spots where keeping the powder dry is impossible.

Confirm on the listing:

• Check the product packaging directions to see exact application rate suggestions for your specific room layout.
• Confirm the current nozzle style shown on the puffer bottle to ensure it fits the tight gaps in your home.
• Verify the storage recommendations to ensure you have a dry storage area available for keeping unused powder effective.

How to compare your options: When choosing crawling insect remedies, the primary decision factors are the delivery method, the presence of an attractant, and how long the residual effect lasts. This formula distinguishes itself by pairing a built-in food lure with a mechanical puffer bottle dispenser, removing the need for a separate duster tool. Because it continues working for weeks as long as it remains dry, compare it against your space to ensure you can protect the treatment zones from moisture and dampness.

To get the best performance from this powder, direct your applications toward places where crawling insects hide. Use the puffer bottle to inject small, even puffs of dust into narrow spaces such as under large kitchen appliances, behind baseboards, along water pipe openings, and into cabinet gaps. Aim for a light, barely visible dusting rather than heavy piles, which allows insects to walk through the treated area naturally.

Keeping the powder dry is critical to maintain its killing power for weeks. Before puffing the powder, inspect your target zones to ensure surfaces are completely dry and free from condensation or dripping pipes. If an area gets wet during routine household cleaning or from a spill, thoroughly dry the space before applying fresh powder.

Allow the 72-hour window to take effect before judging results. Because the formula acts within 72 hours of contact while insects carry the dust, leave the treated zones undisturbed so the integrated food-grade lure can continue drawing pests out of their hiding spots over time.

What types of pests does this powder kill?
It is formulated to kill roaches, palmetto bugs, water bugs, and silverfish.

How quickly does it work on insects?
Insects that come into contact with the powder will die within 72 hours after initial contact.

How long will the treatment remain effective?
It continues killing target pests for weeks after application, provided that the powder is kept dry.

Is the formula registered with the EPA?
Yes, it is registered with the Environmental Protection Agency under EPA Reg. No. 3-10 for use in homes with people and pets.

Does it require a separate duster tool to apply?
No, the product comes in a 16-ounce puffer bottle designed to make application quick and simple in difficult-to-reach areas.