Silverfish

The moderately-common and well-known silverfish are a wingless, flat insects with two long, slender antennae on the front and three long, slender "bristles" at the rear of a tapered, carrot-shaped body. They are PI inch long when fully grown. The body is covered with shiny silver scales.

Silverfish may be found almost anywhere in the house, but are most common in moist, warm locations (such as laundry rooms and bathrooms around sinks, showers and other plumbing fixtures). They are frequently trapped in the bottom of sinks or bathtubs because they fall in seeking moisture and then cannot climb out. Silverfish are most active at night and run very swiftly with a wiggling motion that resembles the swimming action of a fish.

Silverfish are pests primarily because their presence is a nuisance and an annoyance. Damage to foods, fabric, paper, books, or wallpaper is possible but unlikely in most situations. Significant damage is likely only in cases of very large infestations present over long periods of time.

In other words, control of an occasional silverfish may not be necessary, especially if infestations are limited to small areas. The fist step in control is to eliminate moisture problems where the pests develop (fix plumbing leaks, caulk cracks and gaps, use a fan or a dehumidifier, etc.). Household residual insecticides applied as sprays, dusts, or baits can be used if conditions warrant. Treat cracks, crevices, wall voids and other likely hiding spots in the areas where the pests are noticed.
This article originally appeared in the May 10, 1998 issue, p. 37.

Authors:

Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Yard and Garden, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on April 10, 1998. The information contained within may not be the most current and accurate depending on when it is accessed.