What is fumigation?

Fumigation is a method of pest control that completely fills an area with gaseous pesticides—or fumigants—to suffocate or poison the pests within. This method also penetrates the structure itself, affecting pests that inhabit the physical structure, such as bedbugs, carpet beetles, powder post beetles and drywood termites.

Where can it be used?

Bed bug fumigation is utilized for control of pests in stand-alone buildings (full-structure fumigation) and can be used for multi unit buildings (commodity fumigation). It can also be utilized on cars and watercraft.

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We will guarantee the fumigation services for a period of (180) days, effective date of fumigation treatment, only if client provides in writing that the housing unit the articles are being returned to is declared bed bug free by a canine sent detection dog and shows proof of certification. In the event that re-fumigation is necessary, the client will be responsible for all fees associated with transportation of items in (1) one container to and from the agreed upon re-fumigation location. Our warranty is limited to the container and content(s).

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BED BUG (HEMIPTERA: CIMICIDAE) RESPONSE
TO FUMIGATION USING SULFURYL FLUORIDE

DINI M. MILLER AND MARC L. FISHER
Department of Entomology, Virginia Polytechnic Institute and State University,
Blacksburg, VA 24061
Dow AgroSciences, 9330 Zionsville, Rd., Indianapolis, IN 46268

Abstract Structural fumigation for household nuisance pests, like cockroaches or ants, is generally considered to be
prohibitively expensive. However, for pests that are of public health importance, fumigation may be a more viable
option than previously thought. Infestations of the bed bug, Cimex lectularius, have reached epidemic proportions
in the U.S. and multi-unit housing facilities where residents are elderly or health compromised are increasingly at
risk for bed bug infestations. One such housing facility in Pennsylvania had 40 of 80 apartments treated for bed bugs
within the last two years, yet the bed bug problems continued. Because of the ineffectiveness of spray insecticide
treatments and the health concerns regarding repeated insecticide applications, the Pennsylvania Housing Authority
decided to attempt a whole structure fumigation. Our study evaluated the effectiveness of sulfuryl fluoride (Vikane®)
fumigation for control of bed bugs within the housing facility. Captive bed bug samples of adults, nymphs and eggs,
were placed in locations within each apartment where natural bed bug populations were found. Naturally occurring
bed bugs were collected to evaluate the effects of fumigation on endemic populations. Bed bugs samples were
collected and counted after the fumigation. All adult and nymph bed bug samples, both captive and natural, were
killed during the fumigation. Fumigated bed bug eggs were observed over a two week period within which all of the
eggs collapsed and no hatch was recorded.

INTRODUCTION

The bed bug, Cimex lectularius, is rapidly increasing its economic importance as a household pest in the
United States. The economic impact of a single bed bug infestation depends on several factors including
where the infestation occurs, the damage to people and property, and the effort invested in treatment
measures. Feiden (2007) reported that in 2006 the New York City (NYC) housing authority recorded 6,889
bed bug infestation complaints. In addition, 2,008 NYC building owners received legal summonses from
residents using litigation as their means of compensation for property loss and mental anguish due to bed
bug bites. Bed bug complaints throughout the United States have already resulted in millions of dollars
being spent on remediation efforts and litigation settlements over the last several years.

The situation in New York City is not unique. New bed bug infestations are being reported daily in
homes and other facilities all over the U.S. (Gooch, 2005; Cooper and Harlan, 2004; Kruger, 2000). Most
apartment housing facilities are already under a pest control contract where regular service is provided on
a monthly or quarterly basis, yet the bed bugs continue to proliferate. One of the reasons for the bed bug
proliferation is that they have not been a problem in the U.S. for over 40 years. Therefore, relatively few
insecticide products are labeled for bed bug control. The products that are available are predominantly from
one chemical class, natural pyrethrins or pyrethroids (Gangloff-Kaufmann et al., 2006). However, recent
studies have documented that bed bug populations in the U.S. are highly resistant to pyrethroids (Moore
and Miller, 2006; Potter, 2006, 2005). There are several other types of active ingredients labeled for bed
bug control, (hydroprene, chlorfenapyr, and desiccant dusts) but these toxicants are only partially effective,
or they are so slow acting that the bed bugs have time to reproduce prior to the onset of any toxic effects
(Moore and Miller, 2006).

Because of the difficulty in controlling bed bugs with conventional insecticides, bed bug treatments must
be repeated several times to get populations under control. However, multiple insecticide applications may
not be advisable in situations where the apartment residents are very young, elderly, or health compromised.
Proceedings of the Sixth International Conference on Urban Pests William H Robinson and Dániel Bajomi (editors), 2008
Printed by OOK-Press Kft., H-8200 Veszprém, Pápai út 37/a, Hungary
124 Dini M. Miller and Marc L. Fisher

The efficacy of conventional pest control methods are hindered in multi-unit housing situations by the fact
that bed bugs often move through wall voids from the original infested unit to those adjacent to it, and many
apartment units can be crowded with the resident’s belongings. Most of these belongings provide excellent
bed bug harborage, but they cannot be treated with insecticides. In homes and apartments where there is a
lot of clutter, it is almost impossible for pest management professionals to treat the population effectively.
It is for these reasons that many conventional insecticide treatments have failed. These failures have been
the impetus for the bad publicity and numerous lawsuits currently faced by apartment and hotel managers
wrestling with bed bug problems.

Fumigation is widely used for the control of structural pests, particularly wood destroying insects.
Fumigation is considered economical for control of wood destroying pests because the reduction in
structural damage to the building offsets the cost of the fumigation. However, fumigation is rarely used
to control household pests because the cost is considered prohibitively expensive. A typical fumigation
may cost several thousand dollars for a single-story family home. Because there is the potential for injury
to apartment residents from bed bug bites or pesticide exposure, fumigation for bed bug control may be
more economically viable than previously thought. Fumigation for bed bug control would provide several
advantages over conventional insecticide applications: 1) fumigant would penetrate all of the wall voids and
other locations; 2) all clothing, books, toys, appliances and furniture would be treated; 3) the entire building
would be treated at the same time leaving no refuge for bed bugs within the structure. The most important
advantage of fumigation would be the killing of the bed bug eggs. Conventional insecticide applications
have limited effects on eggs.

Although structural fumigation with sulfuryl fluoride has been widely used in the United States, the
efficacy of sulfuryl fluoride for control of bed bugs, particularly the egg stage has not been published.
The purpose of this study was to determine bed bug (Cimex lectularius) susceptibility to sulfuryl fluoride
(Vikane®) fumigation in a multi-unit housing facility.

MATERIALS AND METHODS

Test Site.The fumigation was conducted at Samuel G. Hubert Apartments in Reading, PA, USA. This apartment
building was built in the 1970s and consisted of eight floors, a central elevator and two interior stairwells for
fire evacuation. The building was constructed in an L shape where two central halls lined with apartment units
on both sides, intersected at 90 degree angle. The first floor did not contain any living space. The remaining
floors consisted of the resident living space. Each floor had 10 apartments that were either efficiency or
single bed room units. The Hubert apartment facility was occupied by elderly, disabled, and other lowincome
residents. Many of the residents had health issues such as asthma or diabetes. Others had decreased
mobility and were bound to wheel chairs. These health issues contributed to the bed bugs problems because
residents were unable to clean or remove clutter in their apartments. According to the facility records, 41 of
the 70 apartment units had been treated for bed bugs using conventional insecticides. Several of the units
had been treated multiple times over the two preceding years but the residents complained that they were
still being bitten by bed bugs.

Site preparation.Residents were provided with a checklist instructing them how to prepare their belongings
so that their mattresses and bedding received the maximum exposure to the fumigant while their food items,
plants, and pets were not exposed. Residents were required to find alternative accommodation for two
days to allow for the fumigation and aeration to take place. Residents were asked to place their overnight
necessities, including clothes, toiletries and medications in plastic bags for the two day period so that no
infested luggage items were removed, and then returned to the premises.

Bed Bug Samples. Seven days prior to the fumigation, pairs of blood fed adult bed bugs (1 male; 1 female) were removed from rearing containers at the Virginia Tech Dodson Urban Pest Management Laboratory and confined in Petri
dishes (60 mm) lined with filter paper. The bed bugs mated laid eggs on the filter paper. After the ~5-day
egg laying period, the filter papers were collected and then divided into groups in such a way that each
Bed Bug (Hemiptera: Cimicidae) Response to Fumigation Using Sulfuryl Fluoride 125 group contained > 20 eggs. Each group of filter papers was placed in glass vials (20 ml) covered over the top with mesh fabric secured with a rubber band. Adult and nymph bed bugs (3rd -5th instar) were collected
from rearing containers and separated into groups of 10 (mixed sex). The individual groups were transferred
without anesthesia into mesh covered glass vials (20 ml). Each group of bed bugs, adults, nymphs or eggs
had 13 replicates. The glass vials containing bed bugs were stored inside a cooler containing four frozen
cooling blocks. They were transported 7 hr to the test site where they remained overnight at ~ 5ºC.

Building Preparation. The building is on a slab foundation with solid concrete floors and walls. This type of construction allowed for a tape and seal procedure fumigation instead of having to cover the building with tarps. All of the exterior doors and windows of the building were sealed using vinyl, fabric-reinforced adhesive tape. Doors
and windows on the first floor were sealed from the outside. Doors and windows on the upper floors were
sealed from the inside. Air conditioning units on the first floor were entirely covered on the exterior side
(outdoor) with clear polyethylene sheeting (Visqueen™; 2 mm) and sealed with duct tape; the units on the
upper floors were covered with sheeting and sealed on the interior. Roof vents were covered with plastic
bags and sealed with duct tape.

The building floor plan was used to calculate the number of cubic area of the facility. Each floor was
2,123.8 cubic meters (885 sq m) and each of the stair wells was 206.7 cubic meters (17,404 cubic meters
total). Half-loss time and ounce-hour dosage (CT; concentration of fumigation introduced and the hours
of exposure) was calculated using the Vikane Fumiguide™ system (Dow AgroSciences LLC). This system
allows for entering data on the interior size of the building, foundation type, and quality of the seal around
the building to estimate the amount of fumigant leakage over time. The system calculated the amount of
fumigant that was to be applied to each floor and the individual stairwells.

Five hours prior to the fumigation the apartment complex was cleared of residents and the researchers
and pest management professionals had access to the apartment units. In preparation for the fumigation all
air conditioning in the building was turned off and interior surface temperatures in the hallways measured
between 27-32ºC. During this preparation period, each apartment was inspected for bed bug presence. Five
floors were then selected for fumigation efficacy testing, including the first floor. On the four apartment
floors, five units were selected to receive laboratory reared bed bugs samples. Endemic bed bug specimens
were collected in the test apartments to determine the effects of the fumigation on the naturally occurring
populations. Endemic specimens were collected on site with feather weight forceps and were placed inside
glass jars containing 2 pieces of folded filter paper. The jars (150 ml) were covered on the top with mesh
fabric that was held in place with a metal ring. Captive bed bug specimens (both laboratory and endemic)
were placed in locations within the apartments where endemic bed bugs had been collected, e. g. in between
the mattress and box springs, inside the frame of the box springs, wedged between couch cushions. Each
test apartment received at least 3 vials of bed bugs, one each of the adults, nymphs and eggs. If endemic
bed bugs were collected the apartment unit also had one jar of at least 3 field collected bed bug specimens,
mixed life stages and sex. The first floor received laboratory bed bugs only. These bed bug samples were
placed either on or between cushions in the community room chairs. One set of laboratory reared bed bug
samples (adults, nymphs and eggs) was transported from Blacksburg, VA and placed inside the Hubert
facility during the apartment inspection period. However, these bed bugs were removed from the facility and
placed back inside the cooler prior to the fumigation to serve as controls.

Fumigation

The fumigation was scheduled to begin at 6:00 pm on July 27, 2007. Cylinders of Vikane® gas fumigant
had been secured inside a cargo truck parked at the building. Polyethylene hoses connected to fumigant
cylinders inside the truck were used for fumigant delivery. Additional hoses were used for fumigant
monitoring purposes. The hoses for both fumigant delivery and monitoring had been pulled up from that
back parking lot, through the back stairwell, onto each of the apartment floors through the main hallways
(one hose for monitoring and on hose for fumigant introduction, per floor ). At the midpoint of each hall the
fumigant hose was split with a Y-tube. Each arm of the Y-tube was then fitted with a 3 m section of smaller
126 Dini M. Miller and Marc L. Fisher gauge polyethylene hose (0.64 o.d.). Four fans (45.7 cm) had been placed on each floor, one at the end of each hall. The smaller gauge hose was attached to each fan. At the fan, the polyethylene hose was wrapped around the outside of the fan head so that the end of the hose could be inserted through a copper cylinder
at the base of the fan. The polyethylene hose was pulled through the copper cylinder so that the end of the
hose would release the fumigant directly into the air stream when the fan was turned on. The fans served as
heat exchangers so that the air warmed and dispersed the pressurized fumigant as it exited the hose.

At 6:00 pm the fans were turned on to the high speed (1500 RPM) and the Vikane® cylinders were
opened to introduce the sulfuryl fluoride. The amount of fumigant introduced to each floor and the stairwells
was measured gravimetrically on a balance (Mannix DS 300R). Ambient fumigant concentrations in the
building were periodically sampled through the monitoring hoses. The Fumiscope ® 5.0 (Key Equipment
and Supply Co., Bridgeton, MO) was used to measure the concentration in the samples and ensure that the
appropriate amount of fumigant had been applied to achieve the required concentration over the correct
length of time (CT or ounce per hours). After the calculated amount of fumigant had been released to all
floors, the fans were turned off.

Monitoring of the fumigant half-loss time continued throughout the night. The building was then
unsealed and aerated at 6:00 am the next morning. After the aeration period, the fumigant concentration
inside the building was measured using an SF-ExplorIR™ (Key Equipment and Supply Co, Bridgeton ,
MO). When the SF-ExplorIR™ reading indicated that the building was safe to enter, all bed bug samples
were collected, placed inside the cooler (< 5ºC) and returned to the laboratory.

Amount of fumigant. The size (cubic meters) of the different locations within the building where the
sulfuryl fluoride was introduced, the amount of fumigant (kg) applied, and the fumigant half-loss time (hrs)
at each location were: Front stairwell, 206.7 cm3, 9.5 kg, 7.9 hrs; Back stairwell, 206.7 cm3, 10.4 kg, 3.9 hrs;
First floor, 2123.8 cm3, 113.4 kg, 41.8 hrs; Second floor, 2123.8 cm3, 113.4 kg, 38.5 hrs; Third floor, 2123.8
cm3, 113.4 kg, 22.7 hrs; Fourth floor, 2123.8 cm3, 113.4 kg, 17.6 hrs; Fifth floor, 2123.8 cm3, 113.4 kg, 21.2
hrs; Sixth floor, 2123.8 cm3, 113.4 kg, 13.0 hrs; Seventh floor, 2123.8 cm3, 113.4 kg, 26.6 hrs; Eighth floor,
2123.8 cm3, 113.4 kg, 20.8 hrs.

RESULTS AND DISCUSSION

Upon return to the laboratory all bed bug samples were inspected for mortality (~14 h after the fumigation
was terminated). There was no mortality among the control bed bug samples (adult and nymph) indicating
that any mortality observed in the fumigated samples was not a result of handling or the transportation
process. Control egg samples appeared undamaged and no eggs had hatched. One hundred percent mortality
was recorded for all fumigated adult and nymph bed bug samples, both laboratory and field collected (Table
1). However, we were unable to detect any differences in the appearance of the fumigated eggs when
compared with the control eggs at 24 h after the fumigation. Usinger (1966) determined that bed bug eggs
held at 23ºC would hatch in approximately 9 days. Therefore, we held all of the bed bugs eggs, both the
control and fumigated, at room temperature (~23ºC), for two weeks to record hatch. Within 3 d of returning
to the laboratory the fumigated eggs began to show visible signs of shrinkage. The sides of the eggs were
collapsing inward and the eggs were becoming discolored. At 4 d post-fumigation the control eggs all
had visible eye spots, however, the fumigated eggs continued to shrink and turn grey. At 7 days after the
fumigation (all eggs were ~10 days old) 8.3% of the control eggs had hatched. Sixty-one percent of the
control eggs had hatched by day 8 and 97.2% had hatched by day 9. Three percent of the control eggs did
not hatch. None of the fumigated eggs had hatched, and all had shriveled, discolored, and were obviously
non-viable by day 16.

BB Fumigation Study

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We coordinate your bed bug treatment Illinois from start to finish, including:

• Vikane Bed Bug Fumigation

• K-9 Scent Detection

• Traditional Pest Control Services

• Relocation Services

• Preparation & Bed Bug Elimination Guidelines

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Our Pest Management Network of approved service providers are accepted into our service network through an intensive qualification and screening process. Providers in our network are committed and dedicated to achieving 100% elimination of bed bugs and other target pest.

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We provide bed bug education and coordination for bed bug treatment services in California including: Los Angeles, San Diego, San Francisco and surrounding areas.

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