Bedbugs – Biology and Control | NC State Extension … | World, Bed Bug Registry Map

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Bedbugs have become a common problem across the country infestations showing up in residences, hotels, college campuses and other places. Many people associate bedbugs with unsanitary conditions, as often is the case with pests such as cockroaches. However, bedbug infestations occur across the spectrum of social and economic settings. Experts have speculated that the increase is more likely due to a number of factors such as increased travel and tourism, changes in tactics used for controlling pests such as cockroaches, and an increasing resistance by bedbugs to the most commonly used insecticides.

Our primary concern is with the common bedbug, Cimex lectularius. Another species in the bedbug family (Cimicidae), Cimex hemipterus, is usually found in more tropical areas and may show up particularly for people engaged in international travel. A number of other species are more frequently associated with birds and bats but on occasion invade homes.

Bedbugs adults are reddish-brown, oval, flattened insects about 316 long and up 18 wide (Figure 1). Engorged (blood-fed) adults are swollen and dull red. Though wingless, adult bedbugs do have small wing pads. The dark-colored eyes stand out and the sides of the collar-like pronotum curve slightly around the head and is covered with long hairs. The nymphs (immatures) resemble the adult but are smaller in size. Newly hatched nymphs are almost colorless whereas engorged (blood-fed) nymphs are reddish and swollen. Bedbug eggs are white, oval eggs about 1 mm long.

Figure 1. Bedbug.

Although humans are the preferred host, bedbugs feed on many warm-blooded animals including rats, mice, dogs, cats, poultry, and other birds. Bats, swallows, and chimney swifts may serve as hosts and may be responsible for causing infestations in or around buildings but they are more typically fed upon by other species in those situations.

There has been no scientifically-based evidence showing that bedbugs transmit diseases. Our major concern is more about the affect of their feeding. Bedbugs do not bore into the skin. They insert their mouthparts into the host's skin and suck out blood. As bedbugs feed, they inject saliva which may produces an allergic reaction that often causes slightly delayed swelling, itching, and irritation that can persist for a week or more. Large infestations of bedbugs may have a noticeable "sweet" odor.

Bedbugs can feed and breed year round under favorable conditions. They typically hide during the day in mattresses or cracks and crevices. Figure 2 shows a bedbug and fecal stains in a mattress seam. Under favorable conditions, each female lays 200 to 500 eggs. When the insects feed regularly, eggs are laid in batches of 10 to 50 at 3 to 15-day intervals. Maximum egg laying occurs when the temperature is above 70F (21C). Eggs are typically not deposited when temperatures drop below 50F (10C). The eggs are coated with a sticky substance that dries after the egg is deposited and causes the eggs to adhere to the object on which they were deposited. Eggs and the eggshells are found, singly or in clusters, in or near the crevices bedbugs are hiding. At temperatures above 21C (70F), eggs hatch in about 10 days. At lower temperatures, hatching may take as long as 28 days.

Newly hatched bugs feed at the first opportunity. They molt five times before reaching maturity and require at least one blood meal between each molt. Immature stages can survive more than two months without feeding; however, most nymphs usually develop into adults within 2 to 6 weeks. Indoors, three or four annual generations may be produced and you will find all stages of bedbugs in an established infestations. Bedbug adults can survive up to a year or more without feeding, which means that infestations may continue to survive even if a house was left vacant for several months.

Bedbugs cannot fly or jump and do not normally crawl long distances. Their primary means of dispersal is through human activity, i.e., people move them from one place to another in luggage, laundry, etc. Animals, particularly birds and bat, may be involved in bed / bat bug dispersal. Piles of cast nymphal skins often accumulate in bedbug hiding places. Figure 3 shows piles of shed skins at the base of bed headboard.

Figure 2. Bedbug and fecal smears on mattress.

Figure 3. Bedbug skins at the base of a headboard.

STEP ONE - confirm that you do have bedbugs. Bedbug bites often leave a reddish slightly swollen welt that can resemble a mosquito bite but typically last longer. Some people do not react as severely. The bites may be in a pattern of 3-4 in a row (depending on the number of bedbugs present and how a person lies on a mattress). However, a bedbug problem cannot be reliably identified solely on the basis of welts or other seemingly insect-related bite marks. It is critical to find actual evidence of the bedbugs: actual insects, shed skins, fecal spots, etc. as shown Figure 2 and Figure 3.

Most of our infestations have been true bedbugs, but on occasion we have had bat bugs and swallow bugs which are difficult to distinguish without a microscope or high magnification lens. A pest control service may be able to help you or you can contact your local county Cooperative Extension center. If you do have bat bugs, check attics, eaves and roof overhangs for signs of bat. If you have bats roosting in your attic, contact a pest control company or wildlife damage control company in your area for assistance. Although most of our bedbug problems are not associated with birds or bats, it's always a good idea to confirm that they are not the source of an infestation or other potential problems. Remove old nesting material as well.

STEP TWO - locate all of their hiding places

STEP THREE - control

Chemical ControlThe next step is to treat bedbug hiding places and his requires work on your part There a many products available for bedbug control. Many people prefer to use less toxic "natural" products; however, most of these chemicals work strictly as contact insecticides, i.e., they must be applied directly to the insects in order to kill them and there is no residual effect meaning that once the chemical dries it will not affect other bedbugs that come into contact with it. Other insecticides leave a residual that remains active for weeks or months after theyre applied. READ THE PRODUCT LABEL TO MAKE SURE YOU UNDERSTAND HOW THE PRODUCT WORKS. Some products are applied as surface sprays (to exposed surfaces) while other treatments are applied only as "crack and crevice" to gaps around baseboards and other such areas and items where bedbugs hide. Insecticidal dust formulations such as diatomaceous earth, silica gel, and more common dust insecticides provide longer residual in these locations. Not all dust products are available to the general public and care is needed when applying them to avoid inhaling the product while applying it. Pesticide applications to furniture, particularly mattresses, should be limited (and perhaps best left to a pest control professional).

Many pest control services now recommend (or require) that treated mattresses and box springs be placed inside sealable casements (Figure 7) that prevent bedbugs from escaping the treatment and also keep other bedbugs from re-infesting the items. When treating furniture for bedbugs make sure you use only products that are labeled for application to these items. You can click on the following links for examples of pesticides available to the general public and pest management professionals. Always read the label and follow directions and safety precautions. Here are some important reminders about using pesticides:

For extreme or difficult infestations, fumigation may be used. Fumigation is not the same as using a "fogger" (total release aerosol). Foggers are not effective in eliminating bedbug infestations. Fumigation uses a toxic gas and you must either seal the entire house (or entire apartment building) or place furniture and other items into an isolated container (e.g., a panel truck or steel storage container) and sealed for treatment (Figure 8). Fumigating an entire house (or apartment) may require that the entire building be covered with a tarpaulin (or completely sealed) in order to treat it. Fumigation will kill all of the bedbugs and is an alternative to other insecticide applications if an entire house is infested; however, it leaves no residual (killing) insecticide.

Non-Chemical Control

Some people prefer to dispose of infested mattresses and other furniture rather than deal with treating them. It is important to dispose of these items properly. First, you must wrap the items in plastic sheeting before carrying it outdoors so your bedbugs do not crawl onto you or drop off indoors unseen which may further spread the infestation. Second, whether you live in a house or an apartment building, never put infested furniture at the curb or next to a dumpster (Figure 9) (if allowed) without first rendering it unusable (e.g., cutting the fabric). Otherwise, someone may take the items which only spreads the bedbug problem further. If you replace infested items, do not bring them into the house until you know you have the problem under control or else these new items will become infested. Clothing and some other items that are infested (or suspected of being infested) can be washed in hot water (or follow the tag on the article); however, washing alone will not always kill bedbugs and their eggs. Heat (drying in clothes dryer on high for about 30 miinutes or until dry) will kill them. Other items may require dry cleaning which can become an expensive option. Simply isolating clothing or other infested items in trash bags may work but remember that bedbugs can survive for more than six months without feeding.

Physical barriers such as double-sided tape on the legs of beds can help keep bedbugs from crawling onto the frame. There are also commercial traps available online that claim to stop bedbugs from migrating onto beds from surrounding areas. However, none of these barriers will help unless you keep bedspreads, blankets, etc. from touching the floor and providing bedbugs with an "alternate route" onto the bed. Keep in mind that these physical barriers help but they are not a fix for bedbug infestation.

Many pest control companies now offer freezing and / or steam treatments for some types of infested furniture such as mattresses and box springs. Another control method that has proven to be effective is heat treatment. This requires that all of the suspected items or in many cases the entire living area be sealed and heated for several hours to > 120F (Figure 10). Heat treatments are not simply a matter of raising the air temperature. The heated air must penetrate all areas of the room / house in order to kill bedbugs that are hiding in household articles, in furniture or clothing, or even in walls. Excessive heating can damage furniture, electronics, and other items and may even start a fire if not done properly

The best approach to dealing with bedbugs combines both chemical and non-chemical methods in order to provide a greater likelihood of control. However, even with the use of fumigation, heat and/or conventional insecticides, there is currently no treatment method that can prevent bedbugs from being reintroduced into and reinfesting a home or any other building.

Figure 4. Look carefully for bedbugs.

Figure 5. Check under furniture for bedbugs.

Figure 6. Check fabric under chairs for evidence of bedbugs.

Figure 7. Mattress encasements.

Rick Cooper, Cooper Pest Solutions, Lawrenceville, NJ

Figure 8. Fumigation truck.

Figure 9. Do not dispose of infested furniture without rendering it unusable.

Figure 10. Heat treatment for bedbugs.

You never know when and where you might pick up bedbugs. Higher priced hotels or vacation rental properties are no less susceptible to getting bedbugs, but they often have budgets that accommodate more preventive approaches. However, even with the best preventive efforts, almost any property can become home to these hitchhiking pests. The key is to be attentive and prevent the problem from becoming worse. Here are some measures you can take to reduce the likelihood of a problem:

Figure 11. Keep luggage off the floor at hotels and check shelves before placing luggage on them.

Publication date: Nov. 1, 2010

Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by North Carolina Cooperative Extension nor discrimination against similar products or services not mentioned. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage regulations and examine a current product label before applying any chemical. For assistance, contact your county Cooperative Extension agent.

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