What’s Trending in Bed Bugs? PCT — Pest Control Technology
What’s Trending in Bed Bugs?
Are bed bugs still a hot ticket? You bet they are. “The phone is still ringing for bed bug services and in certain markets, especially those in the Southern United States, it’s ringing off the hook,” says Dr. Mike Potter, a researcher at the University of Kentucky who has conducted extensive research and worked with pest management professionals on bed bug issues.
In a recent consumer attitudes survey conducted by the National Pest Management Association, more than 70 percent of urban residents indicated they have encountered bed bugs in their home, office or a hotel.
“The phone is still ringing for bed bug services and in certain markets, especially those in the Southern United States, it’s ringing off the hook,” says Dr. Mike Potter, a researcher at the University of Kentucky who has conducted extensive research and worked with pest management professionals on bed bug issues.
Potter says that pest management professionals receiving fewer calls for bed bugs is not a sign of reduced pest pressure but rather increased competition among PMPs vying for this high ticket service.
“The major gateway cities like New York, Chicago and San Francisco experienced heavy bed bug pressure first and it is now spreading to smaller metropolitan areas with the influx of travel and the mobile nature of bed bugs,” adds Potter.
Dr. Susan Jones, a researcher at the Ohio State University, says the bed bug issue is not losing strength despite some observers’ claims that the market has reached a critical mass.
“The bottom line is that bed bugs are going strong and not going away anytime soon,” says Jones, who says multi-family housing and hospitality accounts continue to be unwilling targets for these annoying pests.
DIFFERENT LOCATIONS. Jones says she has seen an uptick in bed bug incidents in office building complexes and the resulting reactions from property managers and human resource personnel have only added fuel to the fire.
“Property managers and HR representatives often have little or no experience dealing with bed bug complaints and the hysteria that ensues does little to solve the problem,” says Jones, who has seen instances where perfectly good, pest-free furniture has been thrown out or employees scrutinized for hygiene issues unnecessarily.
An office building – unlike a high-rise apartment or condominium building or hotel – does not offer a target-rich environment for bed bugs since it lacks their main target – humans at rest for an extended period of time. Survival rates for bed bugs in this setting are low compared to other locations but that doesn’t stop the overreaction from taking place.
Jones suggests PMPs set up surveillance and monitoring programs to reassure clients they on top of the issue and ready to react.
Jones also says there is a strong need for more bed bug education in commercial accounts. Collateral material for clients and town hall meetings for residents of multi-family housing complexes that offer helpful tips on bed bug prevention strategies are some of the strategies that can be deployed.
“It is a budget issue for many property managers but it is too costly not to make the investment in the long run,” adds Jones.
PREVENTIVE OFFERINGS. The interest in marketing preventive bed bug services is also on the rise among pest management professionals. These programs include regular inspections, active mattress liners, mattress encasements and preventive, targeted treatments using non-repellant residual materials directed at suspected harborage locations (i.e., bed frames, under furniture, along the room perimeter, etc.).
Preventive services, however, are proving to be a tougher sell for pest professionals due to cost and a lack of understanding of how a preventive program’s elements work and the benefits.
The University of Kentucky’s Potter says PMPs are finding more success marketing preventive bed bug programs to commercial clients with whom they have established service agreements for other pest services and whose businesses’ brand and bottom line would suffer if an infestation was known to customers.
Bed bug litigation continues to be an issue for pest professionals and thorough documentation of service records is essential.
“Don’t be reluctant to document everything during an inspection or treatment, the more detail the better,” says Potter. “Bed bug services have become similar to termite treatments when it comes to litigation.”
He says insurance carriers for property management companies or hotels will request a pest management company’s service records to review contract structure, list of pre-service requirements, what preventive measures were recommended, what treatments were performed and the effectiveness of those treatments.
PRICING. Another trend that will likely impact the bed bug market in the future is the price it charges for services.
“Consumers want easy, cost-effective solutions for their bed bugs problems and those often are beyond their grasp,” says Jones. “Bed bugs are an expensive pest to treat for because of the labor intensive nature of the work and the fact multiple treatments are necessary. Many consumers are giving up on service or putting it off until they can afford it.”
When it comes to product technology for bed bug control monitoring and surveillance products, traditional pesticides and heat treatments continue to be the tools of choice for PMPs.
Potter says the search for the “magic monitor” continues as do questions about what is the correct number to deploy in an account and how to work around the visibility issue with customers. And while dusts are an effective tool for PMPs, the presence of white powder can be unsettling for clients.
When it comes to traditional pesticides Susan Jones reminds PMPs to rotate insecticides to avoid resistance issues with bed bugs, which have shown a propensity to quickly develop resistance.
• Bed bugs are still a significant pest in the United States. A recent consumer survey indicated more than 70 percent of urban residents indicated they have encountered bed bugs in their home, office or a hotel.
• More customer education is needed to help spread the prevention message.
• Bed bug litigation continues to be an issue for pest professionals and thorough documentation of service records is essential.
• Rotate insecticides to avoid resistance issues with bed bugs.
Bed Bugs as Vectors: What We Don’t Know Could Hurt Us
A significant tie between bed bugs and trench fever was discovered and recently published in the journal PLOS Neglected Tropical Diseases.
Are bed bugs vectors? Do they cause more harm than nuisance — and can they spread disease? A significant tie between bed bugs and trench fever was discovered and recently published in the journal PLOS Neglected Tropical Diseases.
Bacterium that causes trench fever is typically transmitted by lice feces. But following a laboratory study where bed bugs were fed three consecutive human blood meals inoculated with Bartonellaquintana bacterium, bed bug feces showed detectable bacterium three days post-infection and during the following 18 days of observation.
Further research showed that the bacterium survives in the “bed bug gut,” says Susan Jones, professor in the Department of Entomology at The Ohio State University. “The research is basically saying, we don’t really know all that much about bed bugs and their ability to harbor and potentially transmit pathogens,” Jones says. “The competency of bed bugs as a vector is unclear.”
Bed bugs are a costly and even painful nuisance to commercial and residential sites that face an infestation (and to the people within who are bitten). But there’s more to it. “Bed bugs are a pest of significant public health importance,” Jones emphasizes. “To call them simply a nuisance pest is to do a grave disservice to those suffering from bed bugs as these ectoparasites cause itchy bites in the majority of humans. Those who are extremely allergic to the bites can experience blood-filled blisters and long-term scarring.”
vector potential. We aren’t sure about bed bugs’ true role in transmitting disease, but this study helps us understand their potential as vectors. The research is a good reminder about how much we don’t know about bed bugs.
“The things we don’t know can come back to hurt us,” Jones says.
What we do know: Tropical bed bugs can harbor B. quintana (the causative agent of trench fever) as cases in Rwanda have indicated, Jones says.
A paper published in a 2013 edition of the American Journal of Tropical Medicine and Hygiene reported molecular identification of the trench fever bacterium in tropical bed bugs collected from a prison in Rwanda. The researchers detected the pathogen’s DNA in the bugs but they were unable to culture the bacteria. Unfortunately, no human blood samples were obtained when the bugs were collected so it’s not known if the bugs had fed on humans carrying the disease organism.
So, it makes sense that lab studies in common bed bugs — like this most recent study — show their competency of carrying the disease organism. But, because the research was conducted in a lab, we can’t be sure of bed bugs’ role as vectors in the natural environment. This leaves the question about bed bugs’ ability to spread disease unanswered, Jones says.
‘Mechanical’ Vectors. More researchers are focused on how bed bugs could act as “mechanical” vectors that can infect humans because of what they leave behind — feces. Bed bugs feed and defecate a lot. “If there is a disease organism alive in the feces and you scratch it into an open wound, then can you potentially get an infection?” Jones asks.
She adds we should dig more into the possibility of bed bugs as mechanical vectors because of their behavior, the impact they have on humans — leaving behind bites that prompt scratching and open wounds — and their defecation activity, which is frequent.
Jones hopes this prompts curiosity among pest management professionals and the research community. We need more information, she said.
The bottom line: We’re not sure about the biological role of bed bugs in natural conditions, outside of the lab. We know tropical bed bugs do spread bacteria, including the pathogen responsible for trench fever. So, be diligent about safety and public health protection while treating for bed bugs, Jones says. “I take great caution to prevent myself from getting bitten by bed bugs when I’m working with them.”
As we learn more about bed bugs’ vector potential, Jones suggests PMPs use best practices in the field when treating them. After controlling an infestation, clean up all evidence, preferably while wearing personal protection equipment such as gloves and a dust mask, she says. Vacuum shed skins. Ensure that all feces are removed. “Weeks after [infection of the bacteria in the lab], this organism was still found in the fecal material,” Jones reminds.
And PMPs should push for more research. Jones says, “It’s misleading to say that bed bugs are not vectors of disease. This has yet to be confirmed or ruled out.”
Bug-and-Breakfast, Anyone? No Thanks!
While the home-sharing model is popular, it certainly isn’t perfect. Sponsoring companies do screen hosts and offer guidelines for both hosts and travelers, but properties are not inspected or required to comply to safety and sanitation standards as hotels are.
The establishment of Airbnb in 2008 changed the way many travelers think about lodging. This peer-to-peer online marketplace began as an alternative for those who were unable to book a hotel room due to saturation at certain times of year. Then, as frequent travelers caught on to the potential savings of short-term home sharing, and residents caught on to the income opportunity, the concept took off. Somewhere along the way, the stigma (and fear) of sleeping on a stranger’s sofa disappeared.
Today, we have a nation of home-sharing hosts and guests, as a variety of companies — HomeAway, FlipKey and CouchSurfing, for example — emerged to compete with Airbnb for their own share of this burgeoning market. As testament to the success of this movement, the hotel industry has come to view short-term home sharing as a true threat to its traditional sales and pricing models.
THE CHALLENGE. But while the home-sharing model is popular, it certainly isn’t perfect. Sponsoring companies do screen hosts and offer guidelines for both hosts and travelers, but properties are not inspected or required to comply to safety and sanitation standards as hotels are. Participants in home-sharing arrangements seem fine with this, trusting their peers completely…until someone starts to itch.
“These companies aren’t held to any pest prevention requirements. That leaves homes and guests wide open to bed bug infestations,” says James Molluso of Northeastern Exterminating in Brooklyn, N.Y. “I know of one company that refunds guests’ money and locks the host out from listing for two weeks (or longer, if the situation hasn’t been rectified) if those guests complain of bed bug bites or other evidence of infestation. It’s a good protocol, but it needs to be supplemented by standard prevention practices.”
Having been a member of the New York City Bed Bug Advisory Board, Gil Bloom of Standard Pest Management subsequently reached out to some of these companies, offering to develop prevention protocols for them. “Even after I explained that the people staying in their places were higher risk because they tend to stay at a multitude of locations as they travel, they were unwilling to address the situation,” he says. “They seemed to be concerned that imposing regulations would cause some hosts to stop participating.”
This philosophy of marching to their own beat is being challenged by the American Hotel & Lodging Association, which is lobbying for greater regulation of short-term online rental companies. Whether these efforts might result in instituting pest management protocols is unclear.
THE SOLUTION. What do Molluso and Bloom see as solutions to this issue of freewheeling bed bugs?
“Minimally annual, but preferably quarterly, inspections, which would identify pest issues before they become full-blown infestations,” says Molluso, who believes that homeowners simply aren’t aware of the magnitude of the bed bug issue. It never occurs to them that guests would bring bugs into their home, he says.
Once called to an apartment or home that has been infested, Molluso offers them incentives to continue regular service. “We provide a dated certificate saying that their house or apartment has been inspected for bed bugs, and explain that this is a good way to promote their listing. Given a choice, people want to stay in a home that is pest-free.”
Bloom says he believes sponsor companies should disseminate information to make every host and guest aware of the potential for bed bug infestations. “Hosts need to be made aware of what to watch for, and guests need recommendations for minimizing their exposure to bed bugs as they travel from home to home. It’s all about enlightenment: Ignoring this issue will not make it go away.”
The author is a frequent contributor to PCT magazine. Email her at [email protected]
‘Think’ Like a Bed Bug
To defeat the enemy, you must know the enemy. Fast-forward to today and researchers and pest managers alike are coming to the realization that there are no silver bullets in today’s war against bed bugs.
Around 512 B.C., Sun Tzu and the brightest military minds agreed: to defeat the enemy, you must know the enemy. Fast-forward to today and researchers and pest managers alike are coming to the realization that there are no “silver bullets” in today’s war against bed bugs. Nonetheless, scientists around the world continue to study bed bug biology and behavior in hopes of finding chinks in their seemingly impenetrable armor. The intent of this article is to give practitioners a better feel for what everyday life is like if you’re a bed bug, and how some of these insights may lead to improvements in management.
BIOLOGY BEGETS BEHAVIOR.To decipher bed bug behavior one must first know the traits that allow them to survive and produce offspring. The most critical adaptation for survival is their ability to feed exclusively on blood. After hatching, bed bugs molt, shedding their exoskeleton five times before reaching adulthood. Each of these five progressions requires that the insect take another blood meal. Bed bug nymphs seemingly behave similarly to adults, although more research should focus on juvenile bed bug behavior. We do know that young nymphs are more prone to desiccation and may have dispersal habits that differ from adult bugs.
Once a bed bug is an adult, they will need to continue to take blood meals in order to lay eggs and produce offspring. Feeding occurs during times when the host (usually us) is least likely to be aware of their presence. Thus, they forage for blood when we are fast asleep, and their bites are not easily detectable. The period during and directly after feeding is often when mating occurs. Mating behavior among bed bugs is traumatic for females, with males piercing their abdominal cavity directly. Each bout of feeding puts a female at risk for roughly five traumatic inseminations, not necessarily from the same male “suitor.” These excessive mating attempts can reduce female lifespan. Mated female bed bugs lay approximately 120 eggs (on average) in their lifetime, enabling infestations to grow rather quickly. These biological principles give rise to predictable behaviors displayed in the field, some with implications for management.
Bed bugs characteristically form dense, hidden aggregations in small spaces.
LOVE THE ONES YOU’RE WITH.If you’re a bed bug, there aren’t many opportunities for privacy. From the moment a pin-head sized “neonate” emerges from an egg, other bugs both younger and older aren’t far away. In fact, scores of individuals may be sharing a crevice no wider or deeper than a toothpick. The tendency for bed bugs to form tightly packed, dense, hidden aggregations is one of the most striking behaviors they exhibit. Within these aggregations, a bed bug will grow, defecate, and mate with other bed bugs that are typically from the same maternal lineage. This aggregation behavior represents a significant advantage to a parasite that feeds on a host that routinely sleeps in the same place. Many of the close relatives of bed bugs, including bat and bird bugs, share the same adaptation.
When deciphering bed bug behavior, it helps to think in terms of what may be in it for the bug. For instance, the tendency of bed bugs to form aggregations would not exist if there were not some intrinsic benefit. Recent studies have revealed that bed bug nymphs reared in groups develop faster than nymphs reared in isolation (Saenz et al. 2014). It also has been shown that bed bugs in an aggregation avoid dehydration much more effectively than bed bugs held alone (Benoit et al. 2007). This probably helps account for the remarkable length of time that bed bugs can survive without taking in any blood — for months, or even more than a year in cooler environments. Seemingly, bed bugs that stick together may fare better when the going gets tough and hosts are scarce. Other benefits that have been proposed but not verified include the ability to discourage predators (although predation on bed bugs in our homes is relatively rare), the transfer of beneficial microorganisms between group members, increased opportunities for mating, or caring for offspring. These behaviors exist in other insects that aggregate, but have not been confirmed for bed bugs.
Bed bugs detect chemical cues in the environment with their antennae.
Although aggregating has clear benefits, it is possible to have too much of a good thing. There are also potential risks associated with large aggregations. For instance, the larger the aggregation gets, the more likely you are to become conspicuous to humans trying to kill you. Additionally, competition for mates might become fiercer within these large groups. Perhaps your risk of infection from fungi or other pathogens rises as feces and other debris accumulate in increasingly crowded areas? These potential risks may explain why some researchers have observed a “cap” to aggregation sizes, which may help us to one day predict why and when bugs within an aggregation may leave their current setup for something better (more on this later).
CONVERSATIONS WE CAN’T HEAR. Much progress has been made in our understanding of why bed bugs aggregate. For a bed bug to detect the presence of another bug and begin the formation of a group there is communication between them. Insects often send messages to one another to initiate a social interaction. An effective message will be received and interpreted by another bug and a behavioral response, such as aggregating, will follow. Although not apparent to us, bed bugs are “talking” in this manner all the time. These conversations are chemical in nature, and since the chemical message benefits the signaler and the receiver — we call them pheromones. Pheromones are the main way insects communicate, and those that cause bed bugs to aggregate are appropriately termed “aggregation pheromones.” Bed bugs detect these compounds with receptors located on their antennae, which serve as the olfactory organ for most insects. Although the social nature of bed bugs cannot be compared to the caste systems of termites or ants, it should be clear that bed bugs do in fact have numerous important social interactions within aggregations.
Bed bugs have few natural enemies, but sometimes are eaten by spiders and ants.
Aggregation pheromones are deposited by bed bugs when they find a suitable place to call home — the seam of a mattress or recliner, crevices of a nightstand, etc. We know that there are two parts to a successful “aggregation message” to other bugs.
One part of the message is released into the air with some of these compounds coming from the scent glands. The other part is deposited directly onto the surface through feces or shed skins and persists in the environment for longer periods of time. All bed bugs respond to the aggregation pheromone. On substrates, five volatile compounds within the feces or on shed skins attract bed bugs to safe places, while a longer-lasting component (histamine) causes bed bugs to stop and remain there (Gries et al. 2015). The arresting power of the compounds is so powerful that they cause bed bugs to rest on surfaces treated with certain insecticides, which otherwise they may find repellent (Romero et al. 2009). Once the bed bugs have found a suitable place to hunker down, the behavior is reinforced through touch; similar to cockroaches, bed bugs respond positively to contact from other bugs and from the walls of small spaces.
Bed bug feces contain a pheromone that causes bed bugs to aggregate.
LEAVE THE ONES YOU’RE WITH. Although bed bugs are considered sedentary creatures, there are many times when they leave the security of their aggregation. Bed bugs move when there’s a perceived threat, when they need to feed, or when their current location is no longer hospitable — such as when a host is no longer available. Bed bugs tend to respond negatively to light so they may move away from light toward darkness. There is also some evidence to suggest that in addition to light and dark detection, bed bugs may use vision to differentiate between darker and lighter harborages, with a preference for darker colors. Understanding the mechanisms and triggers of bed bug movement will help in preventing their spread from one location to another. To better understand bed bug dispersal we need to ask ourselves, “Why would it benefit a bed bug to leave home?” A bed bug on the move risks death when detected by the host. Even without insecticides, humans are a lethal threat and perhaps their greatest risk of a quick demise. Wouldn’t it be wiser to remain inconspicuous? Unfortunately for us, bed bugs have finely tuned adaptations that allow them to avoid periods of time where their movements would be riskiest.
Bed bugs require blood to grow and reproduce, so adaptations for finding a host and taking a blood meal are critical for their survival. Feeding strategies have been fine-tuned over the eons that bed bugs and their buggy ancestors have been parasitizing humans, so they’ve become experts at the process. Every time a bed bug feeds they risk detection and death, so quick movement to and from the host is of paramount importance. Like many other animals, bed bugs follow a circadian rhythm, exhibiting predictable behaviors that occur cyclically over 24-hour periods. For bed bugs, these changes are set by the change from light to dark and in fact, bed bugs move more in the dark than in light even in the absence of host cues. This cyclical pattern includes seemingly random movements that are not directed towards or away from the host, but are, nonetheless, the first step to finding their next meal.
Once they’re triggered by nightfall to move away from aggregations, research indicates that carbon dioxide emission is one of the first cues that stimulate bed bug movement from a distance. As the bug gets closer to a warm-blooded host, their movement becomes more directed as heat is detected. Bed bugs have specialized sensory structures on their antennae that can detect even small fluctuations in temperature. However, bed bugs are not akin to “heat-seeking missiles” — it takes time and many blundering movements based on heat gradients and elevated levels of carbon dioxide to make their way to the host. The exact distances over which bed bugs use heat and carbon dioxide to fine tune their movements are still in question. Determinig whether these directed movements start at a few feet or a few inches from the host requires following the movements of individual bed bugs before feeding.
Bed bugs spotted by humans often suffer a quick demise.
The research regarding attraction to human odors is also controversial. Early research suggested that skin odors could have a subtle effect on host attraction, but not nearly as pronounced as the effect of heat. These results should be taken with some caution, as other studies have actually shown that human perspiration is repellent. More work will be necessary to tease apart the role of human odors on bed bug host-seeking. It seems safe to conclude, however, that heat, carbon dioxide and darkness are definitely triggers for most bed bug movement. It could be that some host cues provide directional information (such as heat, which our lab observed directional orientation within 12 inches; Haynes et al. 2008), while others such as carbon dioxide function more as “activators,” intensifying random movements that are innately turned on each night. (See figure above.)
DO NOT DISTURB. Not all bed bug movements are meant to help them find food; they also may move or disperse in response to threats. Bed bugs emit alarm pheromones when they are disturbed. Interestingly, the bed bug alarm pheromone contains two of the same compounds as the aggregation pheromone, but they are released in much higher quantities when the bed bugs are alarmed. At these levels, these compounds stimulate immediate, rapid movement away from the current location. Unfamiliar touches, light or high, steady levels of carbon dioxide/wind trigger the release of these compounds and subsequent movement. Alarm pheromones, like most chemical compounds for bed bugs, also are detected with the antennae. Humans actually can smell the volatile release of alarm pheromones, that oft-described “obnoxious sweetness” or “buggy” odor that is sometimes evident with heavy infestations. The alarm odor is perhaps most apparent when several bugs are confined in a small container and gently shaken.
Tracks of individual bed bugs in a laboratory test arena. Bed bugs cover a lot of ground at night even when not stimulated by a host (top). Note how they tend to follow the edges of the test arena. Movement is more directed when a heat source warmed to human body temperature is provided (below). (Haynes et al. 2008, PestWorld)
The research regarding movement of unfed bed bugs needs more study. We know that bed bugs move more frequently when they have not fed within a week when compared to bugs that recently fed. However, bed bugs held for five weeks without food moved significantly less than recently fed bugs. This may be a way for a bed bug to conserve energy stores in times when the host is temporarily absent (Romero et al. 2010). We still need to determine whether longer periods without food (such as when an apartment becomes vacant) lead to dispersal away from home base, as it appears to in the bat bug. Complaints involving bat bugs in dwellings often are associated with host dispersal or death.
An important question in respect to management is “How likely is a bed bug to move from one apartment to another and if they move, how far can they go?” Previously, there was a debate focused on whether adult females disperse more than adult males, and it was suggested that females “run from males” in the field because of the damage resulting from excessive traumatic matings. Some laboratory studies seemed to contradict this hypothesis. A recent discovery (Cooper et al. 2015) that more marked females than males were more likely to be found in areas far removed from the place where they were marked is likely to renew the debate. The additional observation that all instars of bed bugs are more mobile than was once postulated may also change the way that we think about dispersal. Obviously it remains critical to know if mated females are in fact more likely to disperse (since they could start a new population), thus more work should be aimed at supporting or refuting this claim.
SILVER BULLET BED BUG TRAP? When an insect relies heavily on communication using pheromones (such as many moth species) it may be possible to trick the insect into honing in on a trap baited with synthetic pheromone blends. Recently, the elusive contact and volatile aggregation pheromone used by bed bugs was deciphered (Gries et al. 2015). This led to high hopes that a synthetic lure could be produced that would effectively detect the presence of infestations in their initial stages. While the recent findings are encouraging, there may be significant hurdles to the utility of such an approach. It is becoming increasingly evident that bed bugs do not rely on pheromones in the same way as many other pest insects that hone in on pheromone sources from great distances. Potent long-range pheromones used by the industry to successfully monitor stored product pests may not work for bed bugs, because it is likely that communication is close range. In fact, one of the main compounds in the aggregation pheromone, histamine, requires direct touch from the bed bug for arrestment and may be detected via taste, not smell.
Furthermore, sex attractant pheromones that have the most impressive value in insect detection for pests such as the Indianmeal moth are not (as far as we can tell) part of the bed bug’s repertoire. Traps baited with synthetic compounds will need to compete with former and existing aggregations of live bed bugs whose interactions are being reinforced by tactile contact. While there’s hope for improved detection using pheromone traps, the industry should probably temper its expectations that the technology will be a panacea in the continuing effort to detect low-level infestations.
Various traps already have been marketed for bed bugs utilizing heat, CO2 and other host odors. However, when bed bugs recently have fed, responses to host cues such as carbon dioxide emission diminish. Thus, at any given time, these traps would not be attractive to the portion of the bed bug population that has recently fed to satiation. To reliably detect bed bugs at low levels, traps would presumably need to be placed in multiple locations within the dwelling, translating to higher cost and conspicuousness. We also know that the concentration of carbon dioxide changes rapidly from the point of exit (nose, mouth), to alongside the skin, to the area surrounding a host. We have not yet honed in on the most attractive concentration for bed bug movement, or determined whether carbon dioxide would perform better released in waves/pulses rather than steady streams.
INTRODUCTION OR INFESTATION? We often hear reports of a school, office, library or clinic that shut down over the presence of one to two bed bugs. The concern often stems from a presumption that one bug can turn into several and that people are likely to transport them home. A key question in respect to whether one bug will turn into several is this: Will it find a host, a mate and an aggregation offering the communal benefits noted previously? In some cases, especially when there are a few widely scattered bugs, it can be as hard for a bug to find us as it is for us to find them. Finding a mate will be no sure bet either, especially if only one bug was introduced, or two bugs of the same sex. The biggest risk of infestation occurs when a fed and mated adult female is introduced, because she has the potential to lay eggs.
However, this still does not ensure that she or her offspring will be able to find a suitable host, especially in settings where there is no sleeping person. All in all, it is probably safe to say that introductions of small numbers of bed bugs into schools, offices, libraries, retail stores and other non-bed environments are unlikely to turn into large infestations as is more common in residences. A bed bug spotted in such places necessitates action — but seldom closure/cessation of operations. While it’s easy to overreact in these situations, resources are better spent educating workers and following established protocols.
WRAP-UP. Understanding insect behavior has long helped the industry battle cockroaches, termites, ants and other foes. Learning to “think” more like a bed bug should yield similar benefits. Although eradicating infestations is the end-goal, there are other benefits to understanding their cryptic ways. Thinking like a bed bug makes us better inspectors and enhances our ability to predict their movements within buildings. It also enables more tactical “strikes” with insecticides and other treatments. Understanding bed bug behavior empowers the industry to communicate more effectively with the public on topics ranging from pretreatment preparation to prevention. If the strategy of “knowing thy enemy” worked for Sun Tzu, then maybe we can put it to work for us, too.