- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. has handled pest control across Frederick County since 2011, operating under Maryland Department of Agriculture license #30263 from our Mt. Airy headquarters. Owner Troy Yowell brings roughly 35 years of pest management experience — including years protecting U.S. military bases overseas from disease-carrying insects and rodents — and works alongside on-staff entomologist Jeffrey Allwine. Our team carries more than 75 years of combined pest management experience and a 5.0 rating across 338+ reviews. Pest Shield was voted Best of Frederick MD Pest Control in 2021 and Best of Nextdoor four years running (2021–2024).
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.
The pest control question in Brunswick isn’t usually which pest — it’s which one next. Western Frederick County’s mix of older housing stock, wooded hillside lots, agricultural surroundings, and Potomac River humidity creates a seasonal cycle where something is always emerging, entering, or settling in. A single treatment handles the moment, but the underlying conditions stay the same.
| Season | Primary Pest Pressure |
|---|---|
| Spring | Pavement and carpenter ants emerging from overwintered colonies, termite swarmers, carpenter bees in wood structures, early spider activity |
| Summer | Mosquitoes off the river corridor, yellow jacket and hornet colonies building, wasps under soffits, ticks from wooded edges |
| Late Summer / Fall | Peak yellow jacket aggression, stink bugs seeking indoor shelter, mice and rats moving in as nights cool, spiders following prey indoors |
| Winter | Rodents nesting in walls and attics, camel crickets and silverfish in basements, overwintering stink bugs and ladybugs |
Brunswick’s geography sharpens each of these. Wooded hillside lots and adjacent farmland push rodents toward heated structures when temperatures drop or fields turn. Older foundations along the river corridor hold moisture that draws roaches, centipedes, water bugs, and silverfish. Mature trees and dense vegetation give carpenter ants and stinging insects easy access to siding, soffits, and decking. That’s why one-time treatments tend to feel like they’re working — until the next cycle starts.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
Pavement ants raided our basement this morning and I was desperate for someone to come today! After calling around and being told they recommended a quarterly service before even seeing our problem and couldn’t come out until Thursday(!!!) I called pest shield and they came this morning. He explained the problem and found the source. He sprayed the area and around the house and doesn’t think we need a service plan. He is also knowledgeable about mosquitoes. Call them!!
Elise Richard · June 2024 Read on Google →
We have used Pest Shield twice so far and each time we had an exceptional experience. We found Troy to be very honest, knowledgeable and professional. This company is built on integrity and will not overcharge you for services that are not needed. They know the biology behind the pests and the problem and won’t just spray to spray something. I highly recommend this company.
Jennifer Swistak · April 2025 Read on Google →
After waiting for my normal pest service to complete the job for 2 months (biggest company in town), I contacted Pest Shield to assist with removing two huge hornets nests from the outside of my house. Troy immediately contacted me, was at my house to inspect the next day and had the hornets nests removed 3 days later. I cancelled all my contracts with the big company and will only use Pest Shield from here on out. Excellent service, responsiveness, expertise and results! You can’t go wrong with Pest Shield!
Matthew Carter · August 2021 Read on Google →
General pest & rodent control
Every new relationship with Pest Shield, Inc. starts with a free inspection. Troy or one of our technicians walks the property — interior trouble spots, exterior perimeter, foundation, soffits, decking, crawl space if applicable — identifies what’s active or likely, and gives you a straight assessment. If a one-time treatment will solve the problem, that’s what we recommend. If the pressure pattern on your property warrants ongoing protection, we’ll explain why and walk you through the Standard Care Plan. We don’t sign people up for plans they don’t need — multiple customers have come to us specifically because other companies tried to.
For homes that need year-round protection, the Standard Care Plan is structured around how pest pressure actually works in Central Maryland:
The exterior-first approach is deliberate. Treating the perimeter is what prevents the indoor problem from happening in the first place — and for homes with kids, pets, gardens, or anyone immunocompromised, it keeps treatment chemicals where they belong. We use EPA-approved products, and nontoxic bio-pesticide options are available when situations call for them. When you call (301) 829-0060, you talk to Troy, an office team member, or a technician directly — no dispatcher, no call center, no subcontractors. Same-day and Sunday response are documented across our reviews at no extra charge.
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.
Brunswick sits along the Potomac River in western Frederick County, where the C&O Canal corridor meets wooded hillside terrain and farmland stretching north and west. The town’s mix of historic 19th-century housing, mid-century homes, and newer riverfront development creates a wide range of building styles — and a wide range of pest entry points for our technicians to assess.
That geography drives the pest pressure here. Adjacent farmland pushes mice and rats toward heated structures when fields turn each fall. Wooded hillside lots feed yellow jacket, hornet, and carpenter ant activity. River corridor humidity favors moisture-loving pests in older basements and crawl spaces. Pest Shield covers Brunswick as part of our Frederick County service area with same-day response when situations warrant it.
Our Standard Care Plan covers the general pest pressure most Brunswick homes face year-round — ants, spiders, cockroaches, stink bugs, crickets, silverfish, water bugs, centipedes, rodents, and similar recurring pests. We also handle stinging insects (yellow jackets, hornets, wasps, carpenter bees), termites under our separate Termite Warranty Plan, bed bugs, fleas, ticks, mosquitoes, and one-time situations like bat removal. If you’re not sure what you’re dealing with, the free inspection figures that out before any treatment is recommended.
Every 60 days — bi-monthly, which is more frequent than the quarterly cadence most national chains offer. The reason is biology: pest life cycles in Central Maryland don’t pause for three months at a time, and 60-day visits interrupt populations before they re-establish. The plan carries a 100% effective guarantee, so if pest activity shows up between scheduled treatments, we come back at no charge.
Yes. We use EPA-approved products, and our exterior-first methodology means most treatment happens around the perimeter of the home — not inside your living space. Nontoxic bio-pesticide options are available when situations call for them, and we’ve handled homes with crawling babies, immunocompromised children, and dogs without issues. If you have specific concerns — a fish tank, an organic garden, a pollinator hive — tell us during the inspection and we’ll plan around it.
No. The Standard Care Plan is built around exterior perimeter treatment, so scheduled visits don’t require you to be home — we treat the foundation, soffits, decking, and exterior trouble spots and leave documentation of what was done. If interior treatment is ever needed for a specific issue, we coordinate that separately at a time that works for you.
Pest Shield is owner-operated out of Mt. Airy, MD, founded in 2011 by Troy Yowell. When you call (301) 829-0060, you talk directly to Troy, an office team member, or a technician — no call center, no dispatcher, no subcontracted work. The team is three field technicians and two office staff, with on-staff entomologist Jeffrey Allwine handling species identification when field ID isn’t conclusive. We were voted Best of Frederick MD Pest Control in 2021 and Best of Nextdoor for four consecutive years.
