The Complete Guide to Termites in Missouri
The Complete Guide to Termites in Missouri
Everything St. Louis homeowners need to know about termite identification, damage, prevention, and treatment — from the licensed professionals who deal with them every day.
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Why Missouri Is a Termite Hotspot
Missouri sits in one of the most active termite pressure zones in the continental United States. If you own a home in the St. Louis metro, the question is not whether termites are nearby — it is whether they have found your house yet.
The USDA’s Termite Infestation Probability (TIP) map classifies Missouri squarely in the “moderate to heavy” zone for subterranean termite activity. Eastern Missouri — including all of St. Louis County, St. Charles County, and Jefferson County — falls into the upper end of that classification. The reasons are deeply rooted in our geography, climate, and construction history.
Climate. Missouri’s warm, humid summers create ideal conditions for termite colonies to thrive and expand. Subterranean termites require moisture to survive, and our average annual rainfall of 40 to 44 inches provides exactly that. The soil rarely freezes deep enough or long enough during winter to kill established colonies — they simply retreat deeper underground and resume foraging when temperatures climb above 50 degrees Fahrenheit in spring. The Mississippi and Missouri river corridors produce persistent humidity that keeps soil moisture elevated year-round, particularly in the bottomland areas throughout the metro region.
Soil conditions. The clay-heavy soils found across much of eastern Missouri retain moisture exceptionally well, creating the damp subsurface environment that subterranean termites depend on. The loess deposits along the river bluffs — the same geological features that give St. Louis its rolling terrain — create deep, workable soil profiles that termite colonies exploit to build expansive tunnel networks. Colonies can extend their foraging galleries more than 300 feet from the central nest through these accommodating soils, according to research documented in Truman’s Scientific Guide to Pest Management Operations.
Building practices. Much of the St. Louis metro’s housing stock was built during the mid-20th century expansion, an era when builders routinely left construction debris — scrap wood, form boards, tree stumps — buried in backfill around foundations. This buried cellulose acts as a termite magnet, drawing foraging workers directly to the structure. Homes with poured concrete foundations over crawl spaces, common throughout south St. Louis County and Jefferson County, provide the cracks and expansion joints that termites exploit to enter from below. Even slab-on-grade construction, prevalent in newer subdivisions, is vulnerable at plumbing penetrations and along the foundation-to-sill plate interface.
The combination of these factors means that termite colonies are not a distant possibility for Missouri homeowners — they are a present reality. Multiple university extension programs, including the University of Missouri Extension, consistently rank termites as the most economically significant wood-destroying pest in the state.
Types of Termites in Missouri
Three termite species have been documented in Missouri. One of them is responsible for virtually all structural damage in the St. Louis region.
This is the species behind nearly every case of termite damage in the St. Louis metro and across all of eastern Missouri. R. flavipes is the most widely distributed and economically destructive termite species in North America. Workers are pale, soft-bodied insects roughly 3 mm (one-eighth of an inch) long. They live exclusively in the soil and must maintain contact with ground moisture to survive. Colonies build distinctive mud tubes — pencil-width tunnels made of soil, saliva, and fecal matter — to bridge the gap between soil and above-ground wood. Swarmers emerge in large numbers during warm days between March and May, often triggered by rain followed by sunshine. Mature colonies contain 60,000 to over one million individuals and can consume roughly 5 grams of wood per day — the equivalent of about one foot of a standard 2×4 per year.
Present in Missouri but far less common than R. flavipes, particularly in the southern and southeastern portions of the state. R. virginicus swarmers are noticeably darker than their eastern subterranean cousins — nearly black — and tend to swarm slightly later in the spring season, typically from late April into June. Their biology and behavior are similar to R. flavipes: they are subterranean, moisture-dependent, and build mud tubes. Colony sizes tend to be somewhat smaller. From a homeowner’s perspective, the treatment approach is identical to that for the eastern subterranean species. Identification between the two species requires close examination of soldier head capsules and swarmer wing venation patterns, typically performed by a trained entomologist or experienced pest management professional.
Drywood termites are extremely rare in Missouri and do not establish outdoor colonies in our climate. On the uncommon occasions they appear, it is almost always in furniture, picture frames, or wooden items shipped from the Gulf Coast or western states where drywood species are established. Unlike subterranean termites, drywood termites live entirely within the wood they consume and do not require soil contact. They produce distinctive hexagonal fecal pellets (frass) that accumulate below kick-out holes in infested wood. If you find drywood termite evidence in Missouri, the infestation is isolated to the imported item and does not indicate a broader structural risk. The affected item can usually be treated individually or removed.
Termite Life Cycle & Castes
Understanding how a termite colony is organized helps explain why they are so difficult to control — and why treatments that only target visible termites fail.
Termites are eusocial insects, meaning they live in highly organized colonies with distinct castes that perform specialized roles. A single colony functions as a superorganism: no individual caste can survive on its own. This social structure is both the colony’s greatest strength and, as we will explain in the treatment section, its greatest vulnerability.
Workers make up the vast majority of a colony — roughly 90 to 95 percent of the population. They are blind, wingless, soft-bodied, and pale white, typically around 3 mm long. Workers are the caste responsible for all of the damage to structures because they are the only caste that actually feeds on wood. They consume cellulose, digest it with the help of symbiotic protozoa in their hindgut, and share the processed nutrients with every other member of the colony through trophallaxis — mouth-to-mouth feeding. Workers also build and maintain the mud tubes, tend the eggs and young nymphs, and groom the queen and soldiers. Their constant foraging activity means they are exploring your property around the clock, 365 days a year.
Soldiers constitute roughly 2 to 4 percent of a colony. They are similar in size to workers but are distinguished by their enlarged, hardened, yellowish-brown heads and prominent mandibles (jaws). Their sole function is defense — primarily against ant raids, which are the greatest natural threat to termite colonies. Soldiers cannot feed themselves; they are entirely dependent on workers for nutrition via trophallaxis. When a mud tube or gallery is breached, soldiers rush to the opening and use their large heads to physically block the gap while workers repair it. The presence of soldiers in a damaged piece of wood confirms an active infestation rather than old, abandoned damage.
Swarmers are the winged reproductive caste, produced by mature colonies that are typically at least three to five years old. In the St. Louis area, eastern subterranean termite swarms occur primarily between March and May, usually on warm days following spring rain. Swarmers emerge in large numbers — sometimes thousands from a single colony — fly a short distance, shed their wings, pair off, and attempt to establish new colonies. The vast majority die within hours due to predation, desiccation, or failure to find suitable soil. Finding swarmer wings indoors — particularly near windows, sliding doors, or basement window wells — is one of the most reliable indicators that an active colony is present within or immediately adjacent to your home’s foundation.
Every colony begins with a single mated pair: a queen and king that were once swarmers themselves. After mating, the queen’s abdomen swells dramatically as her egg-laying capacity increases. A mature queen can produce thousands of eggs per day, sustaining colony growth over a lifespan of 15 to 25 years. The queen also produces pheromones that regulate caste development within the colony, determining how many nymphs develop into workers, soldiers, or future swarmers based on the colony’s needs. The king remains with the queen in a central royal chamber deep in the nest. If the primary queen dies, supplementary reproductives — called neotenics — can take over egg production, allowing the colony to survive. This redundancy is one reason why simply killing visible termites or destroying a single mud tube does nothing to eliminate the colony.
Signs of Termite Infestation
Termite damage is almost always hidden behind walls, beneath floors, or inside structural wood — which is why infestations often go undetected for years. Knowing what to look for can mean the difference between a minor issue and a major structural repair.
This is the single most definitive sign of subterranean termite activity. Mud tubes are pencil-width tunnels made of soil, saliva, and fecal material that termites construct to travel between the soil (their moisture source) and above-ground wood (their food source). Check your foundation walls — interior and exterior — your basement walls, support piers, plumbing penetrations, and any place where concrete meets wood. Tubes can be found on concrete, stone, brick, and even metal surfaces. Break a section open: if live termites are present inside, the infestation is active. If the tube is empty, it may be old — but monitor the area closely, as termites frequently rebuild abandoned tubes.
After their brief mating flight, termite swarmers shed their wings. Piles of identical, translucent wings near window sills, along baseboards, in window wells, or near exterior doors are a strong indicator that a mature colony exists close to your structure — often directly beneath it. Swarmers emerging inside the home (as opposed to outside near the foundation) is an especially urgent sign, as it typically means the colony has direct access through the slab or foundation.
Tap or knock on baseboards, door frames, window frames, and exposed structural wood in basements and crawl spaces. Wood that sounds hollow or papery when tapped may have been consumed from the inside out. Subterranean termites eat along the soft spring wood grain, leaving a characteristic layered or “pages of a book” pattern inside the wood while leaving the exterior surface intact. A screwdriver or awl pushed into suspect wood with little resistance confirms the damage.
Termites feeding just below a painted surface produce moisture as a byproduct of their activity. This moisture can cause paint to bubble, blister, or peel in a pattern that resembles water damage. If you notice paint damage on interior walls or trim — particularly near the floor line — and cannot identify a plumbing or roof leak as the source, termite activity should be investigated.
As termites consume structural wood — floor joists, subfloor sheathing, header boards, and wall studs — the affected members lose structural integrity. This can manifest as floors that feel soft or springy underfoot, doors and windows that suddenly become difficult to open or close, or visible warping in door frames. These symptoms often mimic normal settling, which is why termite damage frequently goes unrecognized until it becomes severe.
If you can see the internal structure of damaged wood — during renovation, after removing trim, or in exposed basement/crawl space framing — look for the telltale gallery pattern. Subterranean termites consume wood along the grain, creating parallel galleries separated by thin layers of intact wood. The galleries are typically lined with a thin layer of mud or fecal material, giving them a dirty appearance. This pattern is distinct from carpenter ant damage (which produces smooth, clean galleries with no mud) and from fungal wood rot (which causes crumbling, cuboid fracture patterns).
Visible frass — tiny, hexagonal fecal pellets that accumulate below kick-out holes — is a sign of drywood termites, not subterranean termites. Since drywood termites are extremely rare in Missouri and almost exclusively associated with imported furniture, finding frass is uncommon. Subterranean termites use their fecal material in mud tube and gallery construction rather than expelling it, so they do not produce visible droppings. If you do find frass, it most likely indicates a localized drywood infestation in an imported item rather than a structural issue.
Termite Swarmers vs. Flying Ants
This is the single most common identification mistake homeowners make. Every spring, our phones ring with calls about “flying ants” that turn out to be termite swarmers — and occasionally the reverse. Knowing how to tell them apart can save you weeks of worry or, more importantly, alert you to a real termite problem.
| Feature | Termite Swarmer | Flying Ant |
|---|---|---|
| Antennae | Straight, beaded (like a string of tiny pearls) | Elbowed (bent at a sharp angle) |
| Wings | Four wings, all equal length, extending well past the abdomen | Four wings, front pair noticeably longer than rear pair |
| Body Shape | Broad, thick waist — body is roughly the same width throughout | Narrow, pinched waist — distinct constriction between thorax and abdomen |
| Color | Dark brown to black body with pale, translucent wings | Varies: black, brown, reddish, with darker tinted wings |
| Wing Shedding | Wings break off easily; piles of shed wings are common | Wings do not break off as readily |
| Swarm Timing (St. Louis) | March through May, warm days after rain | Late spring through summer, varies by species |
The quick test: Capture one of the insects on a piece of tape or in a clear container. Look at the waist and the antennae. If the waist is thick and the antennae are straight, it is a termite. If the waist is pinched and the antennae are elbowed, it is an ant. When in doubt, bring the sample to a pest management professional — or snap a clear photo and send it to us. We will identify it at no charge.
Both termite swarmers and flying ants emerge in large numbers, and both shed their wings. But the implications are vastly different. A carpenter ant swarm may indicate a moisture or wood decay problem that should be addressed, but carpenter ants do not eat wood — they excavate it for nesting and the structural damage is typically localized and slow. A termite swarm, especially one occurring indoors, indicates an established colony that has been feeding on nearby wood for at least three to five years and requires professional treatment.
How Much Damage Can Termites Do?
Termites are the most economically destructive wood-destroying pest in the United States. The numbers are staggering — and the financial risk to individual homeowners is real.
The Financial Reality of Termite Damage
Termites cause an estimated $5 billion in property damage annually across the United States, according to the National Pest Management Association. The average cost of termite damage repair for a single home ranges from $3,000 to $8,000, with severe cases involving structural member replacement exceeding $15,000 or more.
Critical fact: Standard homeowner’s insurance policies in Missouri do not cover termite damage. Insurance companies classify termite damage as a maintenance issue — a preventable condition — rather than a sudden, accidental loss. This means every dollar of termite repair comes directly out of the homeowner’s pocket.
Understanding the timeline. A common misconception is that termites destroy a house quickly. In reality, a single colony consumes wood slowly — roughly one linear foot of a 2×4 per year for a colony of 60,000 workers. The danger lies in three compounding factors:
1. Detection lag. Because termites feed from the inside out and work behind walls, most infestations go undetected for three to eight years. By the time visible signs appear — sticking doors, sagging floors, crumbling trim — the damage is already extensive. As stated in Truman’s Scientific Guide to Pest Management Operations, the cryptic nature of subterranean termite feeding behavior is the primary reason damage reaches structurally significant levels before discovery.
2. Multiple colonies. Properties in high-pressure areas like the St. Louis metro often have more than one colony foraging in the vicinity. Research has documented multiple independent colonies simultaneously attacking a single structure from different entry points. Each colony operates independently, compounding the rate of damage.
3. Critical structural members. Termites do not distinguish between a cosmetic baseboard and a load-bearing floor joist. When they attack sill plates (the wood that sits directly on the foundation), rim joists, or subfloor sheathing, the structural consequences can be serious. A compromised sill plate can cause entire wall sections to shift, cracking drywall, jamming windows, and in extreme cases, creating safety hazards.
The key takeaway is this: termite damage is cumulative, hidden, uninsured, and entirely preventable with proper monitoring and treatment. The cost of prevention is a fraction of the cost of repair.
Sentricon Always Active — How It Works
Roberts Pest Control uses the Sentricon Always Active system — the most scientifically validated termite colony elimination technology available. Here is exactly how it works, and why we chose it.
- Station Installation — Sentricon stations are installed in the soil around your home’s perimeter at regular intervals, typically every 10 to 20 feet, and adjacent to any known or suspected termite activity. Each station contains Recruit HD bait — a compressed cellulose matrix containing the active ingredient noviflumuron. The bait is present from day one. There is no waiting period, no empty monitoring stations that need to be “converted” later. The system is always active.
- Termite Discovery — As worker termites forage through the soil — which they do continuously, 24 hours a day, 365 days a year — they encounter the bait stations during their normal foraging activity. The cellulose matrix in the bait is specifically engineered to be more palatable to termites than structural wood. When workers find the bait, they preferentially feed on it and recruit additional workers to the food source through trail pheromones.
- Colony-Wide Distribution via Trophallaxis — This is the mechanism that makes Sentricon lethal to the entire colony. Worker termites do not simply eat the bait and die on the spot. They consume the bait, return to the colony, and share the processed material with every other colony member through trophallaxis — the mouth-to-mouth transfer of food that is the fundamental social behavior of all termite colonies. Workers feed soldiers, nymphs, and the queen herself. The active ingredient spreads throughout the entire colony population through this normal feeding behavior.
- Chitin Synthesis Inhibition — Noviflumuron is a chitin synthesis inhibitor (CSI). Chitin is the primary structural component of insect exoskeletons. All termites must periodically molt — shed their exoskeleton and produce a new, larger one — to grow. Noviflumuron disrupts this process at the molecular level. When an affected termite attempts to molt, it cannot form a complete new exoskeleton and dies. Because every caste must molt, and because the active ingredient has been distributed colony-wide through trophallaxis, the entire colony — including the queen — is eliminated.
- Colony Collapse — Colony elimination typically occurs over a period of three to six months following initial bait uptake. As worker numbers decline, the colony can no longer sustain itself. Soldiers starve without workers to feed them. Nymphs fail to develop. The queen, deprived of workers to feed and attend her, eventually dies. The colony does not simply weaken — it is completely eliminated, including all supplementary reproductives that might otherwise allow recovery.
- Continuous Protection — After colony elimination, the Sentricon stations remain in place and are serviced on a regular schedule. This provides ongoing, uninterrupted monitoring and protection against new colonies that may forage into the area in the future. In a high-pressure region like the St. Louis metro, continuous protection is not optional — it is essential. New colonies are constantly establishing and expanding in the surrounding soil. The stations provide a permanent defensive perimeter.
Why Roberts chose Sentricon. We evaluated every termite treatment technology available and chose Sentricon for three reasons: it eliminates colonies rather than merely repelling them, it requires no chemical application to the soil or structure (making it the lowest-impact option for the environment, your family, and your pets), and its continuous monitoring component means new threats are detected and addressed before damage begins. Over 70 peer-reviewed scientific studies support the efficacy of the Sentricon system, more than any other termite management product on the market.
Sentricon vs. Liquid Barrier Treatments
Homeowners researching termite treatment will encounter two primary approaches: bait systems (such as Sentricon) and liquid barrier treatments (such as Termidor). Both have merit. Here is an honest comparison.
| Factor | Sentricon Always Active | Liquid Barrier (e.g., Termidor) |
|---|---|---|
| Goal | Eliminates the entire colony, including the queen | Creates a chemical barrier in soil around the foundation |
| Colony Elimination | Yes — documented colony elimination in peer-reviewed studies | Partial — kills workers that contact the barrier but colony may survive and find untreated gaps |
| Soil Disruption | Minimal — small-diameter stations inserted into soil | Significant — requires trenching around the entire foundation and often drilling through concrete |
| Chemical Volume | Grams of active ingredient in contained bait stations | Hundreds of gallons of diluted termiticide applied to soil |
| Longevity | Continuous protection as long as stations are maintained | Degrades over time (5-10 years); effectiveness depends on soil conditions, drainage, and construction gaps |
| Monitoring | Built-in — stations are inspected on a regular service schedule | None — no way to confirm the barrier is intact without retreatment |
| Environmental Impact | EPA Green Chemistry Challenge Award winner; minimal non-target impact | Large-volume soil application; potential impact on soil organisms |
The bottom line: Liquid barrier treatments like Termidor (fipronil) are effective at killing termites that pass through the treated zone. For many homes, they provide solid protection. However, they do not eliminate the source colony, they degrade over time, and they rely on a complete, unbroken chemical barrier in the soil — something that is difficult to achieve around homes with concrete patios, additions, plumbing penetrations, and complex foundation geometries.
Sentricon addresses the problem at its source by eliminating the colony itself. Even if a single station is never found by termites, the surrounding stations will intercept foraging workers. And because workers actively recruit other workers to the bait, a single point of discovery can lead to colony-wide elimination. For homes in the St. Louis metro — where termite pressure is constant and multiple colonies may be present in any given yard — colony elimination with ongoing monitoring is the approach that provides the most reliable long-term protection.
DIY Termite Treatment — Why It Doesn’t Work
We understand the appeal of handling pest problems yourself. For many pests, homeowner-applied products can be effective. Termites are the exception.
Why Store-Bought Products Fail Against Termites
The fundamental problem with DIY termite treatment is that the termites you can see — swarmers on a window sill, workers in a damaged board — represent a tiny fraction of the colony. The queen, the soldiers, and the vast majority of workers are deep in the soil, completely inaccessible to surface-applied products.
- Retail sprays kill on contact but do not reach the colony in the soil
- Surface treatments repel termites from treated areas but push them to untreated entry points
- Foam products fill visible voids but cannot follow the gallery network through entire wall systems
- Over-the-counter bait stations lack the active ingredient concentration and bait matrix engineering of professional systems
- Without a complete perimeter treatment or properly placed bait system, gaps in coverage are inevitable
- No monitoring component means re-infestation goes undetected until damage recurs
The result: Homeowners spend money on products that kill a few hundred visible termites while the colony of tens of thousands continues feeding inside the walls. The perceived improvement is temporary. The damage continues.
Professional termite management requires specialized knowledge, commercial-grade products, and ongoing monitoring — none of which are available at retail. Proper liquid barrier application, for example, requires calibrated spray equipment, knowledge of soil types and trenching depths, and hundreds of gallons of precisely diluted termiticide. Bait systems require understanding of termite foraging biology, correct station placement relative to the structure and soil conditions, and regular professional inspection.
This is not a pest where DIY effort saves money. It is a pest where DIY effort delays proper treatment and allows damage to escalate. If you suspect termite activity, get a professional evaluation before spending money on retail products that will not solve the problem.
Termite Prevention Tips for Missouri Homeowners
While no prevention measure is a substitute for professional monitoring, these steps reduce the conditions that attract termites and make your home a harder target.
Subterranean termites cannot survive without moisture. Repair leaking gutters and downspouts. Ensure downspout extensions carry water at least 4 feet from the foundation. Correct grading that allows water to pool against foundation walls. Fix plumbing leaks in crawl spaces and basements immediately. Moisture is the single biggest attractant for termite colonies — reducing it around your foundation makes your property less appealing to foraging workers.
Building codes in Missouri require a minimum of 6 inches of clearance between soil grade and any wood components of the structure — including siding, door frames, and deck ledger boards. Over time, landscaping additions, mulch buildup, and grading changes can reduce or eliminate this gap. Inspect your foundation perimeter annually and ensure soil, mulch, and plantings are pulled back from wood contact points. Wood-to-soil contact gives termites direct, hidden access without the need to build visible mud tubes.
Scrap lumber, old fence posts, tree stumps, firewood stacks, cardboard boxes, and construction debris in contact with soil near your foundation act as termite magnets. These cellulose sources draw foraging workers into the immediate vicinity of your home. Remove all wood debris from within 20 feet of the foundation. If tree stumps cannot be removed, grind them below grade and remove the wood chips.
Crawl spaces with inadequate ventilation trap moisture, creating ideal conditions for termite colonization — and wood rot, which further attracts termites. Vents should be unobstructed, and a 6-mil polyethylene vapor barrier should cover exposed soil to reduce moisture migration. Crawl space humidity above 60 percent is a risk factor. Encapsulation systems with dehumidifiers provide the most effective moisture control in crawl spaces.
Firewood stacked against or near the foundation is one of the most common termite attractants we encounter in service calls. Store firewood at least 20 feet from the structure and elevate it off the ground on a metal rack. Inspect firewood before bringing it indoors — mud tubes, live termites, or galleries in the wood indicate the stack has been colonized.
Even with all preventive measures in place, annual professional inspection is the most reliable way to detect termite activity before damage becomes significant. A trained inspector knows where to look, what to look for, and how to distinguish termite evidence from other wood-destroying organisms. In the St. Louis area, annual termite inspections should be considered a standard component of home maintenance — not an optional precaution. The cost of an inspection is negligible compared to the cost of undetected damage.
When to Get a Termite Inspection
Knowing when to call a professional can save you thousands in damage repairs. Here are the situations that warrant a termite inspection.
- Before Buying a Home — Missouri real estate transactions typically involve a Wood-Destroying Insect (WDI) inspection, also known as a termite letter or NPMA-33 report. This inspection documents current or previous termite activity and damage. If you are purchasing a home — especially one built before 1990 — insist on a thorough WDI inspection by a licensed pest management professional, not just a visual walk-through. The inspection report should note evidence of active infestations, previous treatments, conducive conditions, and visible damage.
- If You See Swarmers Indoors — Termite swarmers emerging inside your home — near windows, doors, or from cracks in basement floors or walls — indicate a mature colony with direct access to the structure. This is an urgent situation. While the swarmers themselves do not cause damage, their presence confirms that a colony of tens of thousands of workers has been feeding on structural wood for at least three to five years. Contact a professional immediately.
- If You Find Mud Tubes — Mud tubes on foundation walls, support piers, plumbing penetrations, or any surface bridging soil and wood are definitive evidence of subterranean termite activity. Even if the tubes appear old or abandoned, they warrant professional evaluation. Termites routinely abandon and rebuild tubes, and the presence of old tubes confirms the property is within an established foraging range.
- Annually, as Preventive Maintenance — Given the persistent termite pressure in the St. Louis metro region, annual professional inspections are strongly recommended for all homeowners — even those with active Sentricon systems in place. Inspections cover the interior, exterior, crawl spaces, and accessible attic areas. They identify not only termite evidence but also conducive conditions — moisture problems, wood-to-soil contact, and other risk factors — that can be corrected before they lead to infestation.
- After Nearby Construction or Land Clearing — When neighboring properties undergo construction, demolition, or land clearing, existing termite colonies are disturbed. Displaced workers redirect foraging activity into the surrounding area, increasing pressure on adjacent properties. If significant land disturbance occurs within a few hundred feet of your home, a proactive inspection is wise.
Frequently Asked Questions
How do I know if I have termites?
How fast do termites cause damage?
Does homeowner’s insurance cover termite damage?
How does Sentricon work?
Is Sentricon safe for pets and children?
How long does it take to eliminate a colony?
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