Do you notice small and fast grey bugs in the bathroom occasionally? The moisture in bathrooms, along with the perfect hiding spots in sink and tub drains, provide the ideal habitat for many types of bugs. The small, fast-moving grey bugs that often appear in bathrooms and other moist indoor areas are called silverfish. These insects are harmless to people, but in large numbers, they can cause significant damage to wallpaper and other materials in the home.
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Identifying Small, Fast Grey Bugs
Silverfish is a species belonging to the most primitive group of insects called Thysanura. There are approximately 370 species of silverfish worldwide, with only about three that tend to be found in human dwellings. These small and fast grey bugs are wingless with a flattened body, approximately 1/2-inch long when fully grown.
The scales covering the insect give it a silvery-grey color that can appear metallic. Silverfish are easily identified by their long antennae and three appendages that resemble tails at the end of the abdomen. Immature silverfish resemble the adults, are smaller in size and have similar behaviors.
Habits of Silverfish
Silverfish are nocturnal and live in moist areas such as leaf litter or under bark and rocks. Indoors, they seek out similar conditions in basements and bathrooms. They feed on starchy materials such as wallpaper glue, books, crumbs and dead insects. Their quick, wiggling movement resembles that of a swimming fish.
Infestation of Silverfish
Silverfish can enter the home through tiny cracks, but they usually arrive in items that are brought into the house. Building materials, cardboard boxes, books and even some food packaging can contain silverfish eggs that will quickly hatch in the moist conditions of the home.
In small numbers, these insects don't pose a threat. Over many years, however, the population can grow to become bothersome and damaging. Excessive silverfish can cause wallpaper to peel and stain, and can cause damage to home book collections.
Getting Rid of Silverfish
By far the best treatment for a silverfish problem in the home is to keep everything clean. Regular vacuuming can eliminate some of their food sources as well as their eggs. Clean the areas where they might hide, such as under your sink, and keep your bathroom counters clean.
Reducing moisture also helps. Make sure that bathroom fans are operating to eliminate as much moisture as possible during and after showers. Well-maintained plumbing also will help to reduce silverfish numbers. Leaky pipes create more moisture in the bathroom, which can attract silverfish.
For severe infestations, chemical treatment may be required. Several pest control products that target silverfish are available at hardware and home improvement stores. Always read the full label and follow the instructions exactly as chemical silverfish treatments are often toxic. They can be dangerous to use around kids and pets.
If you don't want to use chemicals, you might have alternatives in your home. Cinnamon sticks, dried rosemary, bay leaves and whole cloves can drive away silverfish due to the strong scent.
Diatomaceous earth dehydrates and kills silverfish, so sprinkling it in areas where you often see them can help get rid of these small and fast grey bugs in the bathroom. Boric acid can also work as an insecticide to take care of silverfish. Sprinkle it where you see silverfish, but use with caution if you have kids or pets.
Jean Godawa is a science educator and writer. She has been writing science-related articles for print and online publications for more than 15 years. Godawa holds a degree in biology and environmental science with a focus on entomology from the University of Toronto. She has conducted field research in the tropical rainforests of southeastern Asia and South America.