- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. has delivered termite treatment across Frederick County since 2011, operating under Maryland Department of Agriculture license MDA #30263 with certified pesticide applicator credentials (MD Certified #19058). Jeffrey Allwine, Pest Shield‘s on-staff entomologist, performs termite protection treatments directly — bringing species-level diagnostic expertise that most residential pest control companies have to outsource. Owner Troy Yowell has approximately 35 years of pest management experience, and Pest Shield has earned recognition as Best of Frederick 2021 and Best of Nextdoor for four consecutive years (2021–2024), with 338+ five-star reviews across Google and HomeAdvisor.
How it works
Four steps. No surprises. Same answer whether it's your first call or your tenth.
You reach Troy or someone on his team directly. No call center, no dispatcher, no routing.
Same-day or next-day for most calls. Emergency stinging-insect situations and real-estate WDI deadlines get priority.
We identify the species, locate entry points, and find the source — not just the symptom.
Written recommendation, straightforward pricing, no obligation. If you don't need treatment, we'll tell you.
Eastern subterranean termites (Reticulitermes flavipes) are the species responsible for termite damage throughout Frederick County and Central Maryland. They live underground, forage through soil, and enter structures through cracks in foundations, gaps around plumbing penetrations, and anywhere wood contacts soil. Most homeowners don’t see them until the damage is already done — and in Myersville’s older housing stock, that damage can be substantial before it becomes visible.
The most common trigger for a call is a spring termite swarm — winged reproductives emerging from a mature colony to establish new ones. Swarmers inside the house, especially near windows or light sources, are a reliable indicator that a colony is active in or under the structure. But swarmers are only one sign. Others to look for:
What makes subterranean termites particularly difficult to catch early is that the colony can be active for years before any surface sign appears. Myersville’s setting compounds this: the Frederick County foothills have clay-heavy soils that retain moisture year-round, creating the sustained damp conditions subterranean termites require. Older homes in the area — many built mid-20th century or earlier — often have wood-to-soil contact points, unencapsulated crawl spaces, and foundation designs that modern construction standards have moved away from. Wooded lots bring foraging termite colonies close to foundations. The combination of soil conditions, housing age, and tree canopy makes this a higher-pressure environment than newer suburban developments with drier, better-drained soils.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
Troy came out immediately to look at our house and did find termites, he was very professional, friendly and made us feel very comfortable; he explained everything to us; we had did some comparsion shopping with other companies and didn’t get the comfortable feeling with the other companies, Pest Shield was by far the best, I would recommend Pest Shield to anyone, they are a company that you can trust to have your best interest at heart. Troy was the best.
Linda Allen · July 2014 Read on HomeAdvisor →
Troy seems to genuinely like what he does and to educate his customers. He came to appointment ahead of time, explained things thoroughly, even taking me to crawl space under house to show where termites were entering house. Price was very competitive: price per linear foot was lower than other company and estimator from other company had included perimeter of a shed which, from my understanding, should not have been included because shed has no foundation, so not subject to invasion by termites. Work performed on time and as advertised. As indicated by others, a knowledgeable, competent and honest gentleman.
Otto Louis-Jacques · December 2015 Read on HomeAdvisor →
Troy was very friendly, knowledgeable, and professional. He was able to work with my historic home (with difficult access) and treat for my termite infestation. He was very reasonable with cost as compared to other quotes, especially the big pest companies (which I would not recommend). He was incredibly respectful of my newly planted grass and garden (as he had to maneuver his supplies through it to treat). He even helped to troubleshoot a leak in that part of the house. His communication was very clear and thorough as well. Initial inspection and treatment were prompt! Would definitely recommend.
Julia · May 2022 Read on Google →
General pest & rodent control
Termidor® HE works differently from older contact-kill termiticides, and understanding the mechanism explains why it’s effective where other products fall short. Subterranean termites cannot detect Termidor HE — they move through the treated zone without any behavioral change, pick up the active ingredient (fipronil) on their bodies, and carry it back into the colony. Through normal grooming and contact between nestmates, the product transfers through the population. Workers, soldiers, and reproductives that never contacted the treated zone directly are eliminated through this transfer effect. The result is colony elimination, not just suppression of the termites that happen to cross the treatment line. Pest Shield’s Termite Warranty Plan specifies 90-day colony eradication — that timeline reflects how long the transfer effect takes to work through a mature colony.
The application process begins with a thorough inspection. Troy inspects the full property — crawl space, foundation perimeter, slab areas, and any structural wood accessible from below — identifying where termites are entering and where the colony is foraging. He takes homeowners through what he finds directly; as one customer noted, Troy took them into the crawl space to show exactly where termites were entering the house. That inspection shapes the treatment: Termidor HE is applied around the house perimeter, into porch slabs and garage slabs, and with additional treatment concentrated on areas of active termite activity. Jeffrey Allwine, Pest Shield’s on-staff entomologist, performs termite protection treatments and brings species-level expertise to the diagnostic and treatment process.
| Termite Warranty Plan — Key Terms | Detail |
|---|---|
| Treatment product | Termidor® HE — one-time application |
| Colony eradication timeline | Within 90 days |
| Residual effectiveness | 15+ years in the treated zone |
| Guarantee | 100% effective guarantee |
| Warranty | Lifetime renewable warranty |
The 15+ year residual matters because Termidor HE binds tightly to soil particles and does not break down or migrate the way older liquid termiticides did. The treated zone around the foundation remains an active barrier for well over a decade — any new foraging termites that contact it are subject to the same transfer effect. The lifetime renewable warranty reflects that durability: the treatment is designed to be a long-term solution, not a starting point for annual service calls.
Once the treated zone dries, it presents no exposure risk to family members, pets, or landscaping. Termidor HE is EPA-registered, and the application is perimeter-focused — product is applied to soil and slab areas outside the living space, not broadcast inside the home. Troy is documented as being attentive to landscaping during treatment; one customer noted he was “incredibly respectful of my newly planted grass and garden” while maneuvering equipment around the property. The free inspection is the first step — no treatment is recommended until the inspection confirms what’s present and where.
Owner
Founded Pest Shield in 2011 after years as a pest management contractor on U.S. military bases in Iraq and Afghanistan. Around 35 years in pest management. Personally handles or leads the majority of service calls.
Pest Management Specialist
Field technician handling residential and commercial service calls across Frederick, Carroll, and Montgomery counties.
Pest Management Specialist
Field technician handling residential and commercial service calls across the service area.
Our Entomologist
Consulting entomologist on species identification, conducive conditions, and treatment strategy for difficult cases.
Myersville sits at the base of South Mountain in the Frederick County foothills, roughly along MD Route 17 between Frederick and Boonsboro. Pest Shield serves Myersville as part of its Frederick County territory, alongside Brunswick, Middletown, New Market, Walkersville, and the city of Frederick — all accessible via I-70 and US-40 corridors that run through the county.
The clay-heavy soils common throughout the Frederick County foothills retain moisture through dry summers and cold winters, sustaining the damp subsurface conditions that Reticulitermes flavipes colonies require year-round. Myersville’s wooded lots and older housing stock — including homes with crawl spaces, stone foundations, and wood-to-soil contact points that predate modern construction standards — create the specific structural vulnerabilities that make pest control in Myersville more persistent than in newer, better-drained developments.
Termidor HE works through what’s called the transfer effect. Termites cannot detect the active ingredient (fipronil) and move through the treated zone normally, picking it up on their bodies. When they return to the colony and interact with nestmates through grooming and contact, they transfer the product to termites that never touched the treated zone directly — including workers, soldiers, and reproductives deep in the nest. Colony elimination typically occurs within 90 days, which is why Pest Shield’s Termite Warranty Plan specifies that timeline rather than promising immediate knockdown. A contact-kill product stops individual termites at the barrier; Termidor HE uses the colony’s own social behavior to eliminate it from within.
Pest Shield’s Termite Warranty Plan includes a lifetime renewable warranty backed by a 100% effective guarantee. The one-time Termidor HE application carries 15+ year residual effectiveness in the treated zone, so the warranty reflects the durability of the treatment rather than requiring annual retreatment to stay valid. If termite activity were to return, the warranty covers retreatment. “Renewable” means the warranty can be maintained and extended over time — it’s designed as a long-term protection relationship, not a single-year coverage window.
Termidor HE is EPA-registered, and once the treated zone dries, it presents no exposure risk to people, pets, or plants. The application is perimeter-focused — product is applied to soil and slab areas outside the living space, not broadcast inside the home. Fipronil binds tightly to soil particles and does not migrate into groundwater or volatilize into the air after application. Troy is attentive to landscaping during treatment; customers have noted he worked carefully around planted areas and gardens while applying the perimeter treatment.
The 90-day timeline reflects the biology of how Termidor HE works through a colony via the transfer effect — it’s not a slow product, it’s a thorough one. You may see reduced surface termite activity within weeks as the colony is disrupted, but full colony elimination — including reproductives and the queen — typically completes within 90 days. Pest Shield’s Termite Warranty Plan specifies this timeline as the eradication standard. You won’t necessarily see termites dying; the more meaningful indicator is the absence of new mud tube construction and no further evidence of active feeding after the treatment window closes.
The free inspection is the starting point for every new client relationship at Pest Shield — no treatment is recommended until the inspection confirms what’s present and where. Troy inspects the full property, including crawl spaces and foundation perimeter, and walks homeowners through what he finds directly. Pest Shield has a well-documented pattern of telling customers when they don’t need treatment; across dozens of reviews, customers describe Troy providing honest second opinions that contradicted expensive recommendations from other companies. If the inspection finds no active termite activity, he’ll say so. There’s no obligation and no hard sell — the inspection exists to give you an accurate picture of your property.
