- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. (MDA #30263) has been serving Frederick County homeowners since 2011, with over 75 years of combined pest management experience across the team. Owner Troy Yowell brings approximately 35 years in the industry — including pest management work on U.S. military bases in Iraq and Afghanistan — and leads the majority of rodent service calls personally. When species identification is uncertain, on-staff entomologist Jeffrey Allwine provides laboratory-level analysis. Pest Shield holds a 5.0 rating across 338+ reviews on Google and HomeAdvisor, with dozens specifically documenting effective, honest rodent work.
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.
Most New Market homeowners don’t discover a rat problem the moment it starts. Rats are nocturnal, cautious, and good at staying hidden — by the time you notice the signs, the infestation has typically been active for weeks. Knowing what to look for is the first step toward getting it resolved.
New Market’s location at the edge of Frederick County’s active farmland and wooded corridors creates real seasonal pressure. As crops are harvested in late summer and fall, rats that have been living in field margins lose their cover and food source — and they move toward structures. When temperatures drop, that pressure intensifies. Attic and wall-void infestations are particularly common in the area, and many homeowners don’t realize the problem has been active for weeks until the signs become impossible to ignore. A single treatment that doesn’t address how rats are entering — and what’s drawing them in — often leaves the underlying conditions in place.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
We contacted Troy from Pest Shield when another exterminator told us we had a mouse infestation in our attic. They wanted to remove all our insulation, find and eliminate the mice as well as block any holes and blow in new insulation. The cost was going to be about 5K to do all this. We didn’t feel comfortable just paying that kind of money without getting a second opinion, so we contacted Pest Shield for help. Troy came out the same day, inspected our attic and told us there was no infestation and very little evidence of any mice in our attic at all. Talk about a sense of relief, whew! Pest Shield now handles all our pest needs. Troy is very honest, dependable and keeps all the critters out of our house. Trust Troy and his team and you won’t regret it for a minute.
John Moore · June 2023 Read on Google →
pest shield has done an incredible job. We had used other companies who were unsuccessful at getting rid of mice. Pest Shield doesn’t even come into the house! Since Pest Shield started working at our house, we have not had any problems at all! Robert is terrific.
Ira Polon · October 2021 Read on Google →
Troy was very knowledgeable, professional, courteous, and prompt. They eliminated my mice problem and came out for follow up visit to seal off any entry points from outside. Very reasonably priced for the service provided. Used top notch products, instead of just sitting out glue traps. Highly recommend them.
Kevin Smith · February 2016 Read on HomeAdvisor →
General pest & rodent control
Pest Shield’s approach to rat control starts with a free inspection — not a sales pitch. Troy or a technician assesses the property to identify where rats are entering, where they’re active, and what’s drawing them in. That inspection drives the treatment plan. The approach is exterior-first by design: Pest Shield focuses on the perimeter and entry points rather than defaulting to interior treatment. As one customer put it directly: “Pest Shield doesn’t even come into the house!” — and that’s not an accident. Keeping professional-grade products outside the living space is better for your family and more effective at stopping the problem at its source.
What the process looks like in practice:
One pattern worth knowing: Pest Shield is regularly called in after other companies have recommended expensive attic insulation removal for mice or rat activity. Troy has documented multiple cases where competitors quoted $3,000–$5,000 for full insulation removal and replacement — and his inspection found minimal evidence that warranted it. Pest Shield assesses honestly and recommends only what the situation actually requires.
For homeowners who want to hold the perimeter after initial treatment, Pest Shield offers the Standard Care Plan — treatment every 60 days (bi-monthly, more frequent than the industry-standard quarterly cadence), complete exterior treatment focus, no need to be home, and a 100% effective guarantee with free retreatment between scheduled visits if pest activity reappears. New Market’s agricultural surroundings and seasonal rodent pressure make ongoing pest protection in New Market a practical choice for many households, but it’s offered when it makes sense — not pushed as a default.
Pest Shield’s products are professional-grade and EPA-approved. The exterior-first approach minimizes interior chemical exposure, and nontoxic options are available for homes with children and pets. Same-day and next-day response is standard — call (301) 829-0060 to schedule a free inspection.
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.
New Market sits in eastern Frederick County along US-70 and I-70, where residential neighborhoods back up to active farmland and wooded corridors running toward the Patuxent River headwaters. The town is roughly 10 miles east of Frederick and 8 miles west of Mt. Airy — Pest Shield’s home base — which puts New Market well within the company’s same-day service range for Frederick County.
That agricultural and wooded edge is the defining factor in New Market’s rodent pressure. Norway rats living in field margins move toward structures when crops are harvested and when fall temperatures drop. Older homes in the area often have foundation gaps, aging sill plates, and utility penetrations that provide easy entry; newer construction can have its own vulnerabilities where conduit and pipe runs weren’t fully sealed. Frederick County’s clay-heavy soils also support Norway rat burrowing near foundations and under concrete slabs — a pattern Pest Shield’s exterior-first inspection process is specifically designed to identify.
The clearest indicators are size and droppings. Norway rat droppings are roughly ¾ inch long — about the size of a raisin — blunt-ended, and capsule-shaped. Mouse droppings are much smaller, closer to ¼ inch, and pointed at the ends. Rats also leave gnaw marks that are larger and rougher than mouse damage, and their grease trails along baseboards and walls are more pronounced. Burrow holes near your foundation (2–3 inches in diameter) are a Norway rat signature — mice don’t burrow. If you’re hearing sounds in the attic or walls at night and the activity seems heavy, rats are more likely than mice. When species identification matters for treatment planning, Pest Shield’s on-staff entomologist Jeffrey Allwine can confirm from samples if field identification isn’t conclusive.
New Market’s position at the edge of Frederick County farmland is the primary driver. Norway rats living in field margins lose cover and food when crops are harvested in late summer and fall — and they move toward structures as temperatures drop. Wooded lots and hedgerows that border residential properties provide travel corridors right to your foundation. This fall-to-winter entry pattern is predictable and well-documented in the region, which is why Pest Shield’s Standard Care Plan uses a 60-day bi-monthly cadence rather than quarterly — it’s calibrated to catch seasonal pressure before it establishes indoors.
A single treatment resolves the active infestation for most situations — Pest Shield’s 30-day follow-up confirms eradication and refreshes bait if needed, and a separate visit seals the entry points rats were using. Whether that’s sufficient long-term depends on your property’s surroundings. For New Market homes that border farmland or wooded corridors, seasonal pressure tends to recur — new rats move toward structures each fall regardless of whether the previous infestation was fully resolved. Pest Shield’s Standard Care Plan (60-day bi-monthly exterior treatment, 100% effective guarantee, free retreatment between visits) is designed for exactly that pattern: it holds the perimeter through the seasons so a resolved problem stays resolved. Troy will tell you honestly whether ongoing service makes sense for your specific property — it’s not a default recommendation.
Pest Shield’s exterior-first approach is the primary safety measure — by focusing treatment on the perimeter and entry points rather than interior spaces, professional-grade products stay outside the living areas where children and pets spend their time. When interior baiting is warranted (attic or basement), bait is placed in locations inaccessible to pets and children. EPA-approved products are used throughout, and nontoxic options are available for households with specific concerns. Troy has documented experience working in homes with dogs, immunocompromised children, and young toddlers — he’ll walk you through exactly what’s being used and where before any treatment begins.
For exterior treatment, you don’t need to be home — Pest Shield’s perimeter-focused approach is designed to be completed without interior access in most cases. Same-day and next-day response is standard; multiple reviews document Troy arriving the same morning a call was placed, and Sunday service at no extra charge is confirmed. For the initial inspection, being present is helpful so Troy can walk you through what he finds and answer questions directly — but it’s not required if your schedule doesn’t allow it. Call (301) 829-0060 to find out how quickly a technician can reach New Market.
