Damage

• Silverfish are an annoyance, but not a health threat. They don't carry disease and, because they have weak jaws, they don't do much damage. They like to eat starches and proteins and will eat grain products, dried meats and the glue behind wallpaper or in bookbindings. Although large infestations are possible, they are rare, according to the University of Minnesota Extension Service. When they do happen, the silverfish may damage leather, fur, silk and rayon; contaminate food; stain clothing and damage curtains.
  
  

Identification

• Silverfish and Firebrats are primitive insects that grow to be about 1/2 inch long. Both insects are shiny, but silverfish are silver or pearl-gray in color, and Firebrats are mottled gray-brown. Both species are wingless, with soft bodies, long, slender antennae and three taillike protrusions from the end of their abdomens. They run very fast and are active at night.
  
  

Habitat

• Silverfish prefer damp, cool places and can be found in basements, closets and bookcases. Firebrats like warm, dark places and can be found in areas around furnaces or the insulation around hot water pipes. They are also found in bookcases and closets, and behind baseboards or window frames.
  
  

Controlling Infestations

• If only a few silverfish are present, you may not need to do anything. However, if you have an infestation, it's better to try nonchemical approaches first. Silverfish need a lot of moisture, so the first step is to eliminate dampness. Fix leaky plumbing and use a dehumidifier. Keep areas such as the bathroom, laundry room and basement clean and dry. Next, seal all cracks and crevices to eliminate breeding and hiding places. Patch holes around pipes and caulk cracks around windows and doors. Finally, remove food supplies by storing paper, books, food and clothing in tightly sealed cabinets or containers. Because household dust is a food source, vacuuming and dusting will also help. Keep new silverfish out of the house by inspecting items brought into the house, especially if they've been in storage.
  
  

Chemical Control

• Only use a pesticide if you have a large infestation that can't be controlled without chemicals. A pesticide should be used along with the methods outlined above, not by itself. Be sure to read and follow directions on the pesticide label carefully. If properly applied, an insecticide should show results in two or three weeks. A continued problem means undiscovered hiding places. If professional help is needed, contact a licensed, reputable pest control company. Companies can be screened through the Better Business Bureau.