How Can You Use Borax to Control Silverfish?


Quick Answer

Pest control professionals and homeowners use pesticides containing borax as part of a bait that silverfish find palatable. When ingested, borax slowly poisons silverfish, interfering with their metabolism and dehydrating them by cracking their exoskeletons. A thin layer of borax pesticide helps control silverfish populations in homes and gardens.

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Full Answer

Wearing a dust mask, apply a thin layer of dust or granular borax pesticide to cracks and crevices and behind appliances in your home. Do not apply pesticide anywhere near food.

Outside, use borax pesticide to keep silverfish from your home's perimeter, garage or shed. In the garden, do not sprinkle it around your plants or in the soil. In large amounts, borax kills your plants and sterilizes the soil. Instead, mix borax with honey and put it in a jar with holes punched in the lid. Silverfish ingest the bait and bring it back to their nests.

Borax powder on its own is not as effective as borax pesticide mixed with bait. Silverfish do not eat borax on its own; they must walk through plain borax powder and them groom themselves to accidentally ingest it.

Silverfish are difficult to spot because they are nocturnal and hide during the day. They feed on pasta, books and paper in the home and hide beneath lumber and mulch outside.

Learn more about Invasive Insects

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