They also have the ability to travel beyond the bedroom, so all adjoining rooms should be checked for infestation. Any area that offers a layer of protection, e.g. dark, isolated areas, should be checked. They do leave excrement droppings behind, so even if they are not seen, you can often see where they have been. The best method to find them is to check only at night, and with a red light.
After treating a mattress or box spring for bed bugs, we recommend encasing each in a bed bug proof cover. This will prevent re-infestation and will make future inspections and treatments easier. Be sure any product that has been sprayed or applied to your mattress is dry before you cover the mattress with a bed bug proof cover. You can make the bed with your freshly laundered linens over a bed bug proof mattress cover.
Pesticides should always be used with caution, and especially when used indoors.  Never use a pesticide for bed bugs that does not bear clear directions stating that it can be used indoors.  Never spray yourself, children or pets with a pesticide.  And follow the label safety directions carefully.  Pesticide labels contain directionsfor use that are not merely suggestions.  Failure to follow directions exactly is illegal and can result in poor control and possible harm to yourself and family.  For more information, see the EPA Consumer Alert on pesticides and bed bugs.
Checking beds for bed bugs was a common practice long ago, especially while traveling. Travelers today should consider doing the same, preferably before unpacking. This would entail examining the bed sheets and seams of the mattress and perhaps box spring for signs of bed bugs, especially along the head (pillow end) of the bed. Experts also remove and check behind headboards since this is a frequent hiding place for bed bugs in hotels. Headboards are heavy and cumbersome, however, and untrained persons should not attempt removal themselves.
Inspection for bed bug infestations must be very thorough. Your primary tool is a flashlight. Since bed bugs are cryptic insects and spend most of their time hiding, you will need a flashlight to find them. You must move and/or disassemble some items while searching including beds, dressers, carpets and rugs. While you inspect, be alert for a bed bug smell which has been described as an obnoxious sweetness or fresh, red raspberries. You should also look for accumulations of cast nymphal skins and for stains of blood spots on sheets and linens. A common location for bed bug infestations is a box spring. The framework is often made of wood and contains cracks can crevices suitable for harborage. Other common areas include wall voids, behind switch plates, interior corners of bedside tables, under the edges of wall to wall carpeting, couches and stuffed chairs.
You are now ready to inspect other items and put these into the clean zone. As you continue to move things into the clean zone, more of the room will open and you can expand this clean zone. Using this method means you will not have to move furniture and items more than twice. This will allow you to concentrate on searching for bed bugs, rather than moving furniture.
One of the easiest ways to identify a bed bug infestation is by the tell-tale bite marks on the face, neck, arms, hands, or any other body parts while sleeping. However, these bite marks may take as long as 14 days to develop in some people so it is important to look for other clues when determining if bed bugs have infested an area. These signs include:
To begin, strip your bed of all sheets, pillowcases, and other bedding, and seal them in plastic garbage bags to keep bed bugs from escaping and infesting other parts of your home. Take the bags straight to the washing machine, and wash them using the hot water setting. Then, dry the bedding on high heat if their tags allow it. This heat treatment will kill any bed bugs or eggs hiding in your bedding.
Dusts have been used to ward off insects from grain storage for centuries, including plant ash, lime, dolomite, certain types of soil, and diatomaceous earth or Kieselguhr.[60] Of these, diatomaceous earth in particular has seen a revival as a nontoxic (when in amorphous form) residual pesticide for bed bug abatement. While diatomaceous earth performed poorly, silica gel may be effective.[61][62]
Turns out, C. lectularius is also forming a resistance to other insecticides, according to a study published online April 10, 2017, in the Journal of Economic Entomology. The researchers, from Purdue University, found that three out of 10 bedbug populations collected in the field showed much less susceptibility to chlorfenapyr, and five of the 10 populations showed reduced susceptibility to bifenthrin, according to a post on Entomology Today. The scientists defined "reduced susceptibility" as a population in which more than 25 percent of the begbugs survived after seven days of exposure to the particular insecticide.
To use sprays effectively to eliminate all traces of bed bugs, you need to know the signs of a bed bug infestation. The first sign that you may have bedbugs are some itchy bite marks on your skin when you wake up in the morning. Dr. Carol DerSarkissian on WebMD says that the bites from bed bugs cause red itchy bumps on the skin.3 You can learn about their other signs and symptoms in my articles on what do bed bug bites look like.
Some less proven heat weapons have been suggested online, such as clothes irons. Clothes irons might reach the temperature needed to kill bed bugs, but the heat won’t penetrate deep into soft materials to where bed bugs might be hiding. You also can’t iron areas besides clothes and sheets, like cracks and crevices in walls, floors, and furniture. The metal surface and high surface heat would damage many of the materials it wasn’t designed to be used on.
You can check bedding, mattresses, furniture, and crevices in walls for bed bug infestation. Do your inspection just before dawn, which is when they are the most active. The bugs will be larger and slower after feeding. Bedbugs will quickly flee from light, so live bugs are best located in the folds and seams of mattresses and sheets. Bedbugs are about the size of an apple seed, about 1/4 inch long. They change from light brown to purple-red after feeding. You may also see their eggs, which are about the same size as the adults. The eggs will often be in seams, cracks, or crevices.
"We originally thought the bedbugs might prefer red because blood is red and that's what they feed on," study co-author Corraine McNeill, an assistant professor of biology at Union College in Lincoln, Nebraska, said in a statement. "However, after doing the study, the main reason we think they preferred red colors is because bedbugs themselves appear red, so they go to these harborages because they want to be with other bedbugs, as they are known to exist in aggregations."
It’s also possible that you won’t see a reaction the first time a bedbug bites since it sometimes can take the body a while to react. (6) Some people will have an immediate reaction, while for others it could take two weeks to emerge. Your body will likely become more sensitive to bedbug bites over time, and if you get bitten repeatedly, it could be only a matter of seconds before your body shows a response.
Bring in only what is needed, and avoid sitting or placing coats and other items on beds, floors and sofas where the bugs commonly reside. Essential items can be placed on a tabletop or other hard surface, preferably away from bedrooms and sleeping areas. Better to sit on a hard (non-upholstered) chair than on sofas and recliners. Also try to avoid leaning or brushing against beds and upholstered furniture. If such items are carried out of infested dwellings (e.g., by sanitation workers or firefighters), it’s best to wrap them in plastic or at least not hold them against your body during transport. Emergency Medical (EMS) personnel may need to take additional precautions, such as removing a patient’s bed bug-infested shoes or clothing, or installing plastic sheeting before transporting them in the emergency vehicle.    
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