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DE: (302) 239-0512
MD: (410) 398-9334
Fax: (302) 239-0514
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MOST COMMON PESTS LIBRARY

You may use the following information to try to identify the pest that's bothering you. Click on names to the right or scroll down the page to see them all. Along with a photo, you'll find the average size and some particular characteristics.

Click any image to see it enlarged in a separate window.

If you need further assistance, we'll take a look and provide you with a free estimate to remove the problem.

    Click to view:

American Cockroach
American Cockroach

1 3/8" - 2 1/8"

Often called a palmettobug, these cockroaches exist worldwide. Color is a reddish brown. Although they can be found in residences, they are much more common in larger commercial buildings that are involved in the food processing industry; restaurants, bakeries, etc. where they usually infest the food storage and preparation areas.

German Cockroach
German Cockroaches

1/2" - 5/8"

This is the most common of the cockroaches. Color is a light brown to tan except for two dark stripes on its upper back. It is not only a nuisance, it has been implicated in outbreaks of illnesses, and has caused allergenic reactions in many people.

Oriental Cockroach
Oriental Cockroach

1" - 1 1/4"

Color is usually shiny black, but may vary to a dark, reddish brown.
They typically enter buildings via door thresholds, utility pipes, and floor drains. Often found in crawl spaces, basements, and on 1st floors, they are despised for their strong, roachy odor.

House Cricket
House Cricket

3/4" - 7/8"

Found throughout the United States.
Crickets are nocturnal and usually hide in dark, warm places during the day. The familiar chirping sound is created by the male rubbing his front wings together. This is his mating call. Crickets seek moisture and tend to damage clothing be eating out large areas of the fabrics.

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Ground Beetle

Ground Beetle

1/16" - 1 3/8"

Color is almost uniformly black and shiny. Often found under stone during the day, a few species even climb trees in search of food. They are a nuisance pest and give off a very unpleasant odor when handled or crushed.

Carpet Beetle
Black Carpet Beetle

1/8" - 1/4"

Color is dull dark brown to black. Found throughout the United States but most commonly in the northeast. As named, they tend to attack carpeting, drapery, clothes, furs, fabric-covered furniture, and stored products, even food products such as flour and cereals.

Earwig
Earwig

1/4" - 1"

The name comes from an old european superstition that these insects enter the ears of sleeping people and bore into the brain. They exist worldwide. Color varies from pale brown with dark markings to uniformly reddish brown to black, but with paler legs. They have a repugnant odor which is released when they are crushed. They are a pest in flour mills, meat packing plants, homes, and nurseries.

Box Elder Bug
Box Elder Bug

1/2"

As the name reflects, this is a major pest of boxelder trees. Color is black with reddish lines on the dorsum. They are a nuisance pest because they enter structures to live through the winter weather. They may leave a red stain behind on curtains, clothing, and drapes. They can also bite, producing a red welt.

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Deer Ticks


Deer Ticks

1/16" - 1/8"

Color is orangish brown except for the legs, which are typically dark. The adults attach themselves to passing deer, whence comes their name. They carry the spirochaete for Lyme disease in humans in the northeast and midwest.

Brown Dog Ticks


Brown Dog Ticks

1/8"

When engorged with blood, usually from dogs, these ticks increase in size up to 1/2". These pests are almost always associated with dogs, but have been termed as vectors for Rocky Mountain Spotted Fever and several other diseases.

Sow Bug
Sow Bug

5/8"

These are arthropods, not insects, and exist worldwide. Color is dark to slate gray, similar to a pillbug. They are naturally addicted to moisture and can be found around areas such as under boards, rocks, flower pots, and decaying vegetation. They are scavengers and cause no damage but are considered a nuisance indoors.

House Spider
House Spider

3/16" - 5/16"

This is the spider most commonly encountered inside the house, the one that made all those webs. Their color is variable, running from a dirty white to brown, It randomly selects its web sites while looking for prey and, consequently, the webs can be found most anywhere.

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Reproductive Termite
Reproductive Termite

3/8"

This is the "swarmer" of the Eastern Subterranean Termite colony. Color is usually black but may be a slightly lighter brown. Note that it has four wings, all of the same length which helps to distinguish it from a flying ant who's underwings are shorter than those on top. Their functions is to find new sites, mate, and begin new colonies. They are essentially kings and queens.

Worker Termite
Worker Termite

1/8"

Color is almost uniformly white or cream. This is the damaging caste of the termite colony. They contain a microbe in their intestines that allows them to injest cellulose (wood) as a nutrient. They must physically receive this attribute from the queen of the colony. They then feed on wood, and, being blind, they cannot tell your house from a tree.

Clothes Moth


Clothes Moth

3/8" - 1/3"

Body and wings are a buff to gold, with a brownish tinge. Wings are long and narrow. As the name says, the larvae of the clothes moths infest and feed mostly on woolen clothing and furs, creating holes and voids, leaving tubes and mats with fibers and feces in them. They have also been found infesting milk products. The adults do not feed.

Silverfish

Silverfish

1/2" - 3/4"

Also known as a bristletail, their color is a silvery satin to gun-metal gray. They are often confused with firebrats which do not have the silvery sheen. They are mostly nocturnal and can be found in tight cracks and crevices. They are paper pests, but will also feed on any meaty protein.

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Moisture ant
Moisture Ant

1/16" - 1/8"

Color is commonly brown, although it may be a darker reddish brown approaching black. They tend to nest in areas of moist, rotting wood, damp crawl spaces, etc. They usually feed on meats and sweets, including other insects. A mostly nuisance pest, they can bring moisture into the areas of their nests, assisting the rotting of wood.

Odorous House Ant
Odorous House Ant

1/16" - 1/8"

Color is brown to black. the name is due to the rotten odor given off when this ant is crushed. They can usually be found around hot water pipes and heaters, in crevices around sinks, etc. They love high protein food such as meat and cheese.

Carpenter Ant
Carpenter Ant

1/8" - 1/2"

Color is usually black but occasionally appears in a reddish brown as shown above. Unlike the termite, the carpenter ant cannot digest wood, but will chew out galleries and hollow places to create nests, resulting in structural damage. They are sometimes evidenced by the appearance of a sawdust-like material with debris in it, including body parts, known as frass.

Firebrat
Firebrat

1/2"

Color is uniformly grayish or grayish with numerous dark markings. Also called a bristletail as is the silverfish. It also has some of the same habits of the silverfish. They like moist areas that are warm and will congregate near boiler rooms, hot attics, hot water pipes, etc. They are fast runners, nocturnal, and prefer tight cracks and crevices. Food is both carbohydrates and proteins, including fabric materials.

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Clover Mite
Clover Mite

1/64"

Color is usually dark red, although adults are also green or rusty brown. This is a tiny nuisance pest which sometimes invades structures by the thousands. They feed only on plants and, in the spring, are often associated with new mulch applications. When crushed , they leave a red stain behind on windowsills, drapes, furniture, etc.

Carpenter Bee
Carpenter Bee

1/2" - 1"

Resembling bumble bees, they are robust in form, but with the top surface of the abdomen mostly bare and shiny. The male has a yellow face, the female a black face. As indicated by their name, they will bore holes in wood to create galleries in which to rear their young. The male bees are aggressive when humans approach

Paper Wasp
Paper Wasp

5/8" - 3/4"

Color is brownish with yellow markings, they are semi-social living in small colonies, but without a worker caste. Their presence is usually noted by a nest consisting of a single layer of paperlike comb with the cells opening downward, usually attached to a horizontal surface such as a window or door frame, soffits, eaves, and rafters.

Yellowjacket
Yellowjacket

3/8" - 5/8"

The yellowjacket is distinctly colored with its abdomen usually banded with yellow and black. They are social and live in nests or colonies. Their biology is complex with responsibilities separated between sterile females, queens, and males. Usually ground nesting, they are noted for their sting when irritated.

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Flea
Flea

1/8"

Color is brownish black to black, but reddish black when full of blood. Fleas are known to be vectors of disease organisms causing both plague and muring typhus. They can also serve as the intermediary host for tapeworm. They are typically found where animals sleep or frequent.

House Mouse
House Mouse

2 1/2" - 3 1/2"

Smooth, dusty gray fur usually adorns these small rodents, although color can vary considerably from place to place. They often nest in various materials such as insulation, and usually use the same pathways along walls, stacked merchandise etc. Mice prefer seeds or cereals for food. They have been know to spread salmonella disease.

Norway Rat
Norway Rat

7" - 9 1/2"

The largest of the common rodents in the temperate regions of the world, it is usually a shaggy brown with scattered black hairs. The fur is coarse with the underside gray to yellowish white. It not only damages and destroys materials by gnawing, it eats and contaminates stored food, and is a carrier of many diseases.

unidentified pest
unidentified critter

0" - 10"

If you can't find your little critter on this list, just contact us with some information. We'll find it, identify it, and put a stop to it's bothersome activities!

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We're a member of the National Pest Management Association, so for more in-depth pest information,
visit Detailed Pest Identification. We'll be happy to answer further questions.

Need more info?
Delaware: (302) 239-0512 Maryland: (410) 398-9334 Fax: (302) 239-0514
Pennsylvania: (610) 444-0520 (610) 565-9460 or 800-827-0512

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