- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. (MDA #30263) has been treating subterranean termite infestations across Frederick County since 2011, with owner Troy Yowell bringing approximately 35 years of pest management experience to every inspection. The company’s on-staff entomologist, Jeffrey Allwine, supports termite diagnostics and treatment — an unusual depth of expertise for a small, owner-operated firm. Pest Shield holds a 5.0 rating across 338+ reviews on Google and HomeAdvisor, and has been recognized as Best of Frederick MD Pest Control (2021) and Best of Nextdoor for four consecutive years.
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.
Subterranean termites — specifically Reticulitermes flavipes, the eastern subterranean termite — are the dominant termite species in Maryland. They live underground, forage through soil, and enter structures through cracks in foundations, crawl space piers, and wood-to-soil contact points. Most homeowners don’t see the termites themselves. What they see are the signs.
Not every discovery comes with obvious structural damage. Many Woodsboro homeowners find termite evidence during a renovation, a routine crawl space inspection, or a real estate transaction — before significant damage has occurred. That’s the best-case scenario. Northern Frederick County’s clay-heavy soils retain moisture year-round, which sustains the underground colonies subterranean termites depend on. Homes with crawl space foundations, wood-to-soil contact, or older construction are at elevated risk — and in Woodsboro, those conditions are common.
A termite swarm is alarming, but it doesn’t automatically mean your home has been severely damaged. What it does mean is that a mature colony is established somewhere nearby — and that a professional inspection is the right next step before drawing any conclusions.
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 is a true professional. He accommodated my schedule by coming after hours to do an inspection. I had gotten a “free inspection” from another BIG, WELL-KNOWN company and they had me believing I had live termites. I was suspicious when they didn’t show up for the initial treatment, and more so when I got conflicting information from people at their company. Turns out I didn’t have termites, and Troy was straight up, didn’t try to rip me off with a service I didn’t need. He SAVED me $1400 and I will surely use him in the future if I ever have a pest problem of any kind! Go Pest Shield!
Marion Entwisle · June 2014 Read on HomeAdvisor →
General pest & rodent control
Every termite engagement starts with a free inspection. Troy walks the property, gets into the crawl space, photographs problem areas, identifies where termites are entering the structure, and explains what he finds before any treatment is recommended. Otto Louis-Jacques, a Pest Shield customer, described Troy “taking me to crawl space under house to show where termites were entering house” — that level of transparency is standard, not exceptional. If treatment is warranted, Pest Shield delivers it under the Termite Warranty Plan using Termidor® HE termiticide.
Termidor HE is applied as a continuous treated zone around the foundation perimeter, in porch slabs, and in garage areas — with additional treatment concentrated on areas of active activity. The mechanism that makes it effective is the transfer effect: subterranean termites that contact the treated zone don’t die immediately. They carry Termidor HE back into the colony on their bodies, transferring it to other termites through normal contact and grooming behavior. This reaches termites that never contacted the treated zone directly — including reproductives deep in the colony. The result is colony-level eradication, not just surface knockdown.
Bait-only systems work differently: they require termites to find and consume bait stations, and they depend on ongoing monitoring visits to confirm activity and replenish bait. Termidor HE’s transfer effect works faster and doesn’t require the colony to find anything — it works through the termites’ own behavior against them.
| Detail | What It Means |
|---|---|
| One-time application | A single Termidor HE treatment — no annual re-treatment required |
| 90-day colony eradication | The transfer effect eliminates the colony within 90 days of treatment |
| 15+ year residual effects | Termidor HE remains active in the treated zone for 15+ years |
| 100% effective guarantee | If the treatment doesn’t fully resolve the infestation, Pest Shield returns at no charge |
| Lifetime renewable warranty | The warranty on your home can be renewed — protecting your investment long-term |
Jeffrey Allwine, Pest Shield’s on-staff entomologist, supports the diagnostic process and treatment program. Having an entomologist on staff — particularly for a small, owner-operated company — means species-level identification and treatment decisions are grounded in actual entomological expertise, not just field experience alone.
After treatment, Troy explains what was done, what to expect over the following 90 days, and what the warranty covers going forward. The Termidor HE treated zone is EPA-registered and, once dry, is safe for family members and pets in and around the home. Pest Shield’s approach is to treat the perimeter thoroughly and let the chemistry do the work — no repeated interior disruption, no ongoing monitoring visits required.
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.
Woodsboro is a small community in northern Frederick County, situated along MD-194 between Walkersville and the Carroll County line. The surrounding area is predominantly agricultural and rural, with a mix of older farmhouses, historic properties, and newer homes on wooded lots. Pest Shield serves Woodsboro as part of its pest control in Woodsboro, MD coverage area, with Troy and the team regularly working throughout the county corridor from Mt. Airy north through Thurmont.
The clay-heavy soils common to northern Frederick County retain moisture well below the surface — conditions that sustain the underground colonies subterranean termites depend on year-round. Older homes in and around Woodsboro, particularly those with crawl space foundations or original wood framing close to grade, carry elevated structural risk. Troy has direct experience with the construction patterns and soil conditions that drive termite pressure in this part of the county.
A swarm of winged insects indoors in spring is a strong indicator that a mature termite colony is established nearby — but the swarmers themselves are not the threat. Termite swarmers (winged reproductives, also called alates) emerge from established colonies in spring to mate and attempt to start new colonies. They shed their wings quickly and most don’t survive. What the swarm tells you is that a colony has been present long enough to produce reproductives — typically three or more years. Flying ants are the most common lookalike: termite swarmers have straight antennae, equal-length wings, and a broad waist, while flying ants have elbowed antennae, unequal wings, and a pinched waist. If you’re not certain which you’re seeing, save a few specimens and call Pest Shield — Troy can identify them, and the inspection is free.
Termidor HE works through what’s called the transfer effect, which is what separates it from conventional contact insecticides. Termites that pass through the treated zone don’t die immediately — they carry the active ingredient back into the colony on their bodies and transfer it to other termites through normal contact and grooming behavior. This reaches workers, soldiers, and reproductives deep in the colony that never contacted the treated zone directly. The result is colony-level eradication, not just knockdown of foragers at the perimeter. Pest Shield applies Termidor HE in a continuous treated zone around the foundation perimeter, porch slabs, and garage areas, with additional treatment concentrated on areas of confirmed activity — the application Tapan Suthar described in his review of Troy’s work.
For subterranean termite treatment under Pest Shield’s Termite Warranty Plan, one Termidor HE application is the treatment — not the start of an annual program. Termidor HE has documented residual effects of 15 or more years in the treated zone, and the transfer effect eliminates the colony within 90 days of application. There are no required annual re-treatment visits. The Termite Warranty Plan includes a lifetime renewable warranty, which means the protection on your home can be maintained long-term — but the chemistry itself doesn’t need to be reapplied on a recurring schedule the way general pest control does. Pest Shield’s 100% effective guarantee means that if the treatment doesn’t fully resolve the infestation, they return at no charge.
Termidor HE is an EPA-registered termiticide applied to the soil around the exterior foundation perimeter — not sprayed inside the home. Once the treated zone has dried, the home is safe for family members and pets. Pest Shield’s exterior-first approach means interior disruption is minimal; the treatment targets the soil where subterranean termites travel, not living spaces. Troy is documented across multiple reviews as being attentive to household safety concerns — including homes with young children and immunocompromised family members — and will explain exactly what was applied and where before leaving the property.
Standard homeowners insurance policies in Maryland do not cover termite damage. Insurers classify termite infestation as a maintenance issue — a preventable condition — rather than a sudden or accidental loss, which is the threshold most policies require. This makes the Termite Warranty Plan’s lifetime renewable warranty meaningful in practical terms: it’s the protection mechanism that covers your home against future termite activity, since your insurance policy won’t. If you’re buying or selling a home in Woodsboro and need a wood-destroying insect (WDI) inspection for a real estate transaction, that’s a separate service — call Pest Shield at (301) 829-0060 to discuss what you need.
