- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. has provided carpenter ant treatment and pest protection to Frederick County homeowners since 2011, operating under Maryland Department of Agriculture license MDA #30263. Owner Troy Yowell brings approximately 35 years of pest management experience to every inspection, and Jeffrey Allwine — an on-staff entomologist — provides species-level identification when field assessment alone isn’t sufficient. Pest Shield has earned 338+ five-star reviews across Google and HomeAdvisor, including recognition 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.
Carpenter ants are one of the more commonly misread pest problems in Central Maryland. Homeowners see large black ants and assume nuisance. What they’re often looking at is Camponotus pennsylvanicus — the Eastern black carpenter ant — actively excavating galleries through the wood framing of their home. Brunswick’s older housing stock, wooded lots along the Potomac River corridor, and moisture-prone basements and crawl spaces make it one of the more hospitable environments for carpenter ant colonies in Frederick County.
Here’s what active carpenter ant activity actually looks like:
Carpenter ants vs. termites: Both damage wood, but differently. Termites consume wood and leave behind mud tubes and a papery surface. Carpenter ants excavate clean, smooth galleries — the wood looks almost sanded inside. If you’re seeing frass and large black ants rather than mud tubes and pale, soft-bodied insects, you’re most likely dealing with carpenter ants. Either way, a free inspection will confirm it.
Carpenter ants are most active in Central Maryland from April through September. A single mature colony can contain several thousand workers. The structural damage they cause is real — slower than termites, but cumulative over multiple seasons, particularly in wood that’s already been compromised by moisture. One-time treatment can knock back visible activity, but carpenter ants are a recurring pressure in wooded environments like Brunswick. The colony may persist in a nearby stump or dead tree and re-establish foraging routes into the home the following spring.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
moved in to a new house and discovered ants. Another company couldn’t get rid of them. Troy got rid of ants very quickly – haven’t seen them since he began treating the house.
Melissa Evans · April 2015 Read on HomeAdvisor →
Troy was awesome. He educated us on what variables we had in our house and yard that were creating an ant-friendly environment so that we can get rid of all factors contributing to our horrific ant infestation. And his products work…he is right, there is not enough bait in the world to get rid of a well established ant colony!
Meagan Simpson · June 2015 Read on HomeAdvisor →
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 →
General pest & rodent control
Every carpenter ant job starts with a free inspection. Troy or one of Pest Shield‘s technicians walks the property — exterior perimeter, foundation, crawl space or basement, and any areas where frass or ant activity has been observed — to locate entry points, assess moisture conditions that may be sustaining a colony, and identify where foraging trails originate. The inspection is diagnostic, not a formality. Findings are explained before any treatment is recommended.
Pest Shield’s approach to carpenter ant treatment is exterior-first: perimeter treatment targets the colony’s foraging routes and entry points rather than chasing individual ants inside the home. As one long-term customer described it, Pest Shield “treats your house primarily from the outside to prevent pests from ever getting into your house and keeps the chemicals out of your home, protecting your family.” For carpenter ants specifically, this means treating the foundation perimeter, entry points at sills and framing, and any exterior wood structures showing signs of activity — addressing the source rather than the symptom.
The treatment process typically follows this sequence:
For carpenter ants in Brunswick, a single treatment will often resolve the immediate visible activity. But carpenter ants are a seasonal, recurring pressure in wooded environments — the colony may be nesting in a stump or dead wood on the property perimeter, and foraging pressure typically returns the following spring. Pest Shield’s Standard Care Plan addresses this directly: treatment every 60 days (bi-monthly — more frequent than the industry-standard quarterly cadence), complete exterior treatment focus, and a 100% effective guarantee with free retreatment between scheduled visits if activity reappears. You don’t need to be home for scheduled treatments. For Brunswick homeowners with wooded lots or older homes with moisture history, the 60-day plan is the practical way to stay ahead of seasonal recurrence rather than reacting to it each year.
The products Pest Shield uses are EPA-approved. The exterior-first application method keeps chemistry away from living spaces by design. For homes with children and pets, nontoxic bio-pesticide options are available — Troy will discuss what’s appropriate based on your property and household during the 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.
Brunswick sits at the western edge of Frederick County along the Potomac River, bordered by the C&O Canal National Historical Park and significant tree canopy on its southern and western edges. US Route 340 connects Brunswick to Frederick to the east and to the Virginia border to the west. The town’s residential neighborhoods include a substantial number of older wood-framed homes — many dating to the early and mid-twentieth century — built when Brunswick was a major B&O Railroad hub.
That combination of mature tree canopy, proximity to the Potomac River corridor, and aging wood-framed construction creates genuine carpenter ant pressure. Dead wood, stumps, and moisture-damaged structural lumber are primary nesting sites for Camponotus pennsylvanicus, and Brunswick’s humid summers accelerate the wood moisture conditions that make older sills, joists, and crawl space framing attractive targets. Pest Shield serves Brunswick as part of its pest control in Brunswick coverage area, with same-day and next-day scheduling available for active infestations.
The clearest distinction is what the damage looks like and what you see near it. Carpenter ants excavate smooth, clean galleries through wood — they don’t eat it — and push out coarse, sawdust-like frass that often contains insect parts. Termites consume wood from the inside and leave behind mud tubes on surfaces and a papery, hollowed appearance. The insects themselves look different too: carpenter ants are large (¼ to ½ inch), black, and segmented with a distinctly narrow waist; termites are pale, soft-bodied, and roughly uniform in shape. If you’re seeing large black ants and frass near wood structures, carpenter ants are the more likely culprit — but a free inspection from Pest Shield will confirm the species and rule out termite activity at the same time.
Fresh frass is the key indicator of active gallery excavation. If the frass is loose, light-colored, and accumulating in a consistent location — particularly near window frames, door sills, or baseboards — that points to current activity. Old frass tends to be compacted, darker, and no longer accumulating. The presence of live worker ants near the frass deposit is the most reliable confirmation. If you’re uncertain, a Pest Shield inspection will assess whether the damage and debris are recent or historical — that distinction matters for deciding whether treatment is warranted and what kind.
A single treatment will typically resolve visible activity and knock back the foraging population. Whether carpenter ants return depends largely on whether the colony source — often a stump, dead tree, or moisture-damaged wood on or near the property — has been eliminated. In wooded environments like Brunswick, new pressure from surrounding areas is common each spring. Pest Shield’s Standard Care Plan (treatment every 60 days, 100% effective guarantee, free retreatment between visits if activity reappears) is designed for exactly this pattern: it maintains a treated perimeter through the active season rather than waiting for ants to re-establish before responding. Troy will give you an honest read on whether one-time treatment is sufficient for your situation or whether the 60-day plan makes more practical sense.
Pest Shield’s exterior-first approach keeps chemical application away from living spaces by design — the perimeter treatment targets foraging routes and entry points outside the home, with little to no interior treatment required in most carpenter ant situations. The products used are EPA-approved, and nontoxic bio-pesticide options are available for households with children and pets. Troy will discuss what’s appropriate for your specific property and household during the free inspection — including any precautions to observe around treated areas after service.
Brunswick is within Pest Shield’s Frederick County service area, and same-day or next-day scheduling is standard for active infestations. Pest Shield’s office hours run Monday through Friday, 8 AM to 5 PM, and Saturday through Sunday, 8 AM to 2 PM — and after-hours and Sunday service has been documented at no extra charge for urgent situations. Call (301) 829-0060 to reach Troy or the team directly; there’s no call center or dispatch layer between you and the people who will do the work.
