Silverfish and Firebrats

Silverfish and firebrats prefer dark places. About the only time they are seen in lighted areas is after having been disturbed. If these insects are found on ceilings, it may be an indication that the infestation is located in the attic of the structure. When the temperature increases in the attic, there seems to be more activity and sightings of these insects. Such sightings would indicate that some form of treatment should be performed in the attic area. Both have characteristic quick movements, stopping at short intervals then rapidly moving on. They are not able to climb on smooth, vertical surfaces. As a result, silverfish or firebrats may get trapped in the bathtub, wash basin, or in glass trays.

The full-grown insect may be from 1/4 to 1/2 inch long; the young are considerably smaller. Both silverfish and firebrats have a silver or gray colored body. But, upon close inspection, the firebrat shows a distinct mottled appearance.

The bodies are thick at the front and taper to a somewhat pointed appearance at the tail. Both of these pests have two long antennae or feelers on the head and three tail-like appendages. The center one of these tail-end feelers is directed straight back from the tip of the body. The firebrat thrives on hot conditions with temperatures between 32° and 43°C (90° and 110°F). At 37°C (98°F) they may pass from egg stage through their entire life cycle in about three months.

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