Photo: Egor Kamelev

How do you tell if there's bugs in your bed?

Rusty or reddish stains on bed sheets or mattresses caused by bed bugs being crushed. Dark spots (about this size: •), which are bed bug excrement and may bleed on the fabric like a marker would. Eggs and eggshells, which are tiny (about 1mm) and pale yellow skins that nymphs shed as they grow larger.

epa.gov - How to Find Bed Bugs | US EPA

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If you have a bed bug infestation, it is best to find it early, before the infestation becomes established or spreads. Treating a minor infestation, while an inconvenience, is far less costly and easier than treating the same infestation after it becomes more widespread. However, low-level infestations are also much more challenging to find and correctly identify. Other insects, such as carpet beetles, can be easily mistaken for bed bugs. If you misidentify a bed bug infestation, it gives the bugs more time to spread to other areas of the house or hitchhike a ride to someone else's house to start a new infestation. Learn about identifying bed bugs. Bites on the skin are a poor indicator of a bed bug infestation. Bed bug bites can look like bites from other insects (such as mosquitoes or chiggers), rashes (such as eczema or fungal infections), or even hives. Some people do not react to bed bug bites at all.

Looking for Signs of Bed Bugs

A more accurate way to identify a possible infestation is to look for physical signs of bed bugs. When cleaning, changing bedding, or staying away from home, look for: Rusty or reddish stains on bed sheets or mattresses caused by bed bugs being crushed. Dark spots (about this size: •), which are bed bug excrement and may bleed on the fabric like a marker would. Eggs and eggshells, which are tiny (about 1mm) and pale yellow skins that nymphs shed as they grow larger.

Live bed bugs.

Where Bed Bugs Hide

Canvas strap of old box spring covering that is housing adults, skin castings, feces, and eggs. (Photo courtesy of Dr. Louis Sorkin) When not feeding, bed bugs hide in a variety of places. Around the bed, they can be found near the piping, seams and tags of the mattress and box spring, and in cracks on the bed frame and headboard.

If the room is heavily infested, you may find bed bugs:

In the seams of chairs and couches, between cushions, in the folds of curtains.

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In drawer joints.

In electrical receptacles and appliances.

Under loose wall paper and wall hangings.

At the junction where the wall and the ceiling meet.

Even in the head of a screw.

Since bed bugs are only about the width of a credit card, they can squeeze into really small hiding spots. If a crack will hold a credit card, it could hide a bed bug.

Close up of bed bug eggs on cardboard

Bed Bug Behavior and Habit

Understanding the behavior of bed bugs (how they eat, live, and reproduce) will help you to find an infestation before it becomes established and to monitor for the presence of bed bugs after your home has been treated.

Feeding:

Appear to prefer to feed on humans, but will feed on other mammals and birds as well. Will readily travel 5-20 feet from established hiding places (called harborage) to feed on a host. Even though they are primarily active at night, if hungry they will seek hosts in full daylight.

Feeding can take 3-12 minutes.

The rusty or tarry spots found on bed sheets or in bug hiding places are because 20% of the time adults and large nymphs will void remains of earlier blood meals while still feeding.

Life stages/mating:

Bed bugs need at least one blood meal before the individual bug can develop to the next of the six life stages. They can feed more than once. Each stage also requires the molting of skin. To continue to mate and produce eggs, both males and females must feed at least once every 14 days. Each female may lay 1 to 3 eggs per day and 200-500 eggs per her lifetime (6-12 months but could be longer).