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Silverfish Extermination
SILVERFISH APPEARANCE, BIOLOGY, HABITS, CONTROL RECOMMENDATIONS

Click on image to enlarge Silverfish Photograph
by: J.L. Castner, University of Florida
Silverfish Appearance
Silverfish is about
1/2 inch long, with a uniform silvery color over the upper surface. Their
bodies are long and slender, flattened. The bodies are broad at the front,
and gradually tapering toward the rear.
They can be found almost anywhere, but prefer damp, moderate temperature
places such as basements, laundry rooms, and under sinks.
.
Silverfish Biology and Habits
- Silverfish prefer a dark, moist environment and require
a large supply of starchy foods or molds.
- Silverfish are considered to be nuisance pests that can feed on wallpaper
pastes, natural textiles, books, and papers.
- Silverfish also feed on mold or fungi that can grow on various surfaces.
- They are fast-moving and can travel throughout buildings.
Once silverfish find a good source of food, however, they stay close
to it.
- Silverfish go through only a three stage life cycle called gradual
metamorphosis, while many insects have a four stage life cycle (complete
metamorphosis).
Silverfish may lay eggs at any time during the year, and take 19-43
days to hatch.
The life cycle from silverfish egg to adult is three to four months.
They prefer humid areas (75 to 97% humidity), like bathrooms and moderate
temperatures (70o to 80o F).
- Silverfish are found in basements, kitchens, sinks, bathtubs, in
bookcases, on closet shelves, behind baseboards, wallpaper, window or
door frames, wall voids, and sub-floor areas.
- Silverfish are active at night or
are active in dark places found throughout the structure.
Silverfish can be a problem year round.
Attics are a favorite place for silverfish due
to the abundant food sources due to the recycled blown in paper insulation
and storage boxes.
You may see silverfish trapped in sinks and bathtubs because they enter
seeking moisture and are unable to climb a slick vertical surface to escape.
Symptoms
and Damage of Silverfish:
- Silverfish
are found in basements, kitchens, sinks, bathtubs, in bookcases, on
closet shelves, behind baseboards, wallpaper, window or door frames,
wall voids, and sub-floor areas.
- Because
they molt during their adult lives their cast skins may be a useful
detection too.
- Silverfish
diets are high in protein, sugar, or starch, including cereals,
moist wheat flour, starch in book bindings, and paper on which there
is glue or paste.
- Silverfish
can damage book bindings, wallpaper, paper goods and dry foods. They
may eat holes, irregular shaped in the wallpaper to get to the paste.
Silverfish may bite very small holes in various fabrics, including cotton,
linen, and silk, even though they cannot digest either linen or cotton.
Firebrats will feed extensively on rayon, whereas silverfish usually
damage it only slightly.
- They may
leave a yellowish stain on fabric.
- Outside,
they may be found in nest of insects, birds, mammals, and under tree
bark and mulch
They can be found in wood shingles or sidings on houses, they may enter
the home from these.
RECOMMENDED MEASURES FOR SILVERFISH
CONTROL:
- Sources of any undue moisture, such as faulty plumbing
or condensation that provide the humidity favored by these pests should
be eliminated.
- Dehumidifying reduces the moisture content of the
air that these insects find essential. Some methods for dehumidifying
include:
Mend leaking pipes.
Ventilate closed rooms and attics.
Eliminate standing water.
Use a dehumidifier an air conditioner.
Use silica gel which acts like a desiccant such as DRIONE
DUST.
- Regularly vacuuming cracks and crevices with a narrow vacuum tip
also can be a good method to physically remove these insects from their
harborages.
- Removal of food sources , stored in tight containers.
- If you have a slight problem of silverfish inside your home, a good
residual perimeter treatment of:
DEMON
WP insecticide or TALSTAR
ONE insecticide

Talstar
One insecticide, sprayed around entry points and foundation
of the house would be sufficient.
Spray along the foundational wall, with a two or three foot band.
Demon WP or Talstar One One:
DEMON WP and Talstar One last for two to three months.
Both products are odorless. The wettable powder (WP) formulation in
the Demon WP will leave a slight film that can be seen against dark
surfaces. The Talstar One does not leave a film.
However if you have a more severe problem with silverfish , look
into stored boxes and the insulation in your attic. It is best to
dust or bait these areas for greater control.
When you use baits or dusts, you do want to get it as close as possible
to their habitats to be effective.
You never want to bait and dust in areas that are visible.
Dust needs to be in hidden areas such as :
Attics-Insulation
Behind Refrigerators and Ovens
Boxes
Light fixtures
Electrical outlets
Under siding .
- A recommended dust for silverfish control would be
DRIONE
DUST. It is a desiccant dust that last for 6 months.
It dries up insects has they pass through it. Apply it in the attic
in the insulation area in particular, under siding, in storage boxes,light
fixtures, electrical outlets.
Apply it to areas that can be kept dry. An easy way to apply DRIONE
DUST, if broadcasting in the insulation area would be the use of a duster
called the DUSTIN
MIZER,cranking out a large amount of dust at a time.
You will want one lb. of dust per 800-1000 sq. ft.
For smaller dust jobs the BULB
DUSTER or BELLOWS
8 OZ. DUSTER would work fine.
- Another very effective way is the use of baits in the attic or on
the outside for silverfish control.
- .
NIBAN
OR INTICE GRANULAR BAITS works very well
against silverfish as well as roaches and crickets.
It can be sprinkled out in a self contained one lb. bag, in all the
areas you believe they are hiding.
- You can also you a residual aerosol like
D-FORCE
HPX with a crack and crevice tip, enabling
you to get behind baseboards and corners of traveling paths of the silverfish.
This type of aerosol is very helpful in bathrooms where silverfish like
to eat the back of wallpaper.
SILVERFISH
PAKS are designed to go inside. These Paks destroy these
year-round pests that eat wool, paper, linen and cellulose materials.
Place odorless, wafer-thin packets under rugs, behind curtains, in closets
and dark hidden places . Place away from children and pets. Niban/Intice
and Silverfish Paks both are designed to attract the silverfish as they
eat, functioning as long term baits.
If you do not know the exact location of the habitat of the silverfish
and cannot treat it directly, baits are ideal for silverfish control.
*** Silverfish Paks is an excellent product to
accompany a through spraying and/or dusting.
It is not advised as a stand alone treatment.
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