- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. has provided licensed pest management to Brunswick and Frederick County homeowners since 2011, operating under MDA License #30263 with over 75 years of combined pest management experience across the team. Owner Troy Yowell brings approximately 35 years of hands-on experience to every inspection, and entomologist Jeffrey Allwine is on staff for cases where species identification requires laboratory analysis. Pest Shield has earned Best of Nextdoor recognition four consecutive years (2021–2024) and Best of Frederick MD Pest Control in 2021, 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.
Spiders don’t move in because they like your house — they move in because their food does. A visible spider population almost always means the home has an underlying insect pressure worth addressing. In Brunswick, that pressure is elevated year-round: older in-town housing with less-sealed foundations and crawl spaces, wooded lots along the Potomac River corridor, and agricultural land to the north all create conditions where insects — and the spiders that follow them — find easy access.
The most common spiders Brunswick homeowners encounter are not dangerous, but their presence is a useful signal. Here’s what you’re likely seeing and what it means:
A single spider sighting is ordinary. Webs reappearing after you clear them, spiders in multiple rooms, or consistent basement and crawl space activity points to an insect population sustaining them — and that’s the problem worth treating.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
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. Pest Shield now protects our home regularly and I recommend them highly.
John Moore · June 2014 Read on HomeAdvisor →
We chose Pest Shield after contacting a few different pest control companies because we liked how Troy took his time to explain his experience and the science behind the products he uses. Troy has been working with us to manage two separate infestations and he has been incredibly generous with his time, energy and expertise. After speaking with my husband, he offered to come out the same day and as he inspected the house, he offered useful suggestions for ways to manage other things like spiders in the windows. We have a young son who is immunocompromised and Troy was very respectful of the safety precautions that we are currently taking. We are so grateful for his knowledge, promptness and kindness.
Erin Swen · December 2021 Read on Google →
Pest Shield has been absolutely wonderful! We had an issue with mice, and Pest Shield was the ONLY company we could get to come out to our house on the same day which happened to be a Sunday. The technician, Troy, was extremely knowledgeable, friendly, and honest. He saved my husband and I a lot of money. Most companies would have taken advantage of the situation. It’s been 30 days and we have not had any more issues. We were so satisfied with the company and the services we received, that we also signed up for the pest (bugs) control service last month. Since then, we have not seen any bugs (including those nasty centipedes and camel crickets)!!! Thank you so much, Pest Shield!!
Myah Moxley · February 2015 Read on HomeAdvisor →
General pest & rodent control
Pest Shield‘s approach to spider control starts with a free inspection — Troy or a technician walks the property, identifies where spiders are active, and assesses what insect pressure is sustaining them. Because spiders are predators, the treatment target is the insect population they’re feeding on, not just the spiders themselves. Eliminating the food source is what produces lasting results; treating visible spiders alone typically leads to reinfestation within weeks.
The primary treatment is an exterior perimeter application targeting the insect populations that draw spiders indoors. As one long-term Pest Shield customer put 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 most Brunswick homes, this means treating foundation lines, entry points, crawl space vents, and the areas around windows and doors where insects — and spiders — find access. Interior treatment is applied when needed, but the exterior-first approach handles the majority of cases with little to no indoor chemical use.
For ongoing protection, Pest Shield offers the Standard Care Plan: treatment every 60 days on a bi-monthly cadence — more frequent than the industry-standard quarterly schedule — with a 100% effective guarantee. If spider or insect activity reappears between scheduled visits, Pest Shield returns at no charge. You don’t need to be home for exterior treatments, and the complete exterior focus means minimal disruption to your household routine.
After the initial treatment, Troy explains what was found, what was treated, and what to expect over the following weeks. Spider activity typically decreases as the insect population drops; most customers see a clear reduction within the first treatment cycle. The Standard Care Plan maintains that reduction through Brunswick’s full seasonal pest cycle — spring insect emergence, summer peak activity, and the fall migration indoors that drives spider pressure highest in older homes.
Pest Shield uses EPA-approved products, and nontoxic bio-pesticide options are available for households with children and pets. The exterior-first approach keeps treatment chemistry outside the living space in the vast majority of cases.
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 in the southwestern corner of Frederick County along the Potomac River, roughly 15 miles southwest of Frederick via US-340. The town is bordered by the C&O Canal National Historical Park and the wooded Potomac River corridor to the south, with agricultural land and rolling terrain extending north toward Burkittsville and Jefferson. Nearby communities served by Pest Shield include Jefferson, Knoxville, Petersville, and Burkittsville, with Frederick and Middletown accessible to the northeast.
Brunswick’s housing stock skews older — much of the in-town residential area dates to the railroad era, with foundations and crawl spaces that were built before modern pest-exclusion standards. Gaps around utility penetrations, aging crawl space vents, and stone or block foundations common in this part of Frederick County give insects and spiders reliable entry points that newer construction typically doesn’t have. The wooded riparian corridor along the Potomac adds sustained insect pressure through the warmer months, making the exterior perimeter approach particularly well-suited to pest control in Brunswick homes.
For most Brunswick homes, a single treatment reduces spider activity noticeably but doesn’t address the underlying insect pressure that draws spiders indoors in the first place. Spiders return when their food source does — and in a home with ongoing insect pressure, that’s a seasonal certainty. Pest Shield’s Standard Care Plan treats every 60 days, which interrupts insect populations before they rebuild and gives spiders no reason to come back. If activity reappears between scheduled visits, Pest Shield returns at no charge. Troy will tell you honestly after the inspection whether a one-time treatment is likely to hold or whether ongoing service makes more sense for your specific situation — he’s documented recommending against plans when they aren’t warranted.
Yes. Pest Shield uses EPA-approved products and has nontoxic bio-pesticide options available for households with children and pets. The exterior-first treatment approach keeps chemical application outside the living space in the vast majority of cases — treatment targets the foundation perimeter, entry points, and crawl space areas rather than interior surfaces. Troy is documented proactively flagging safety considerations for homes with young children and immunocompromised family members, and will walk you through exactly what’s being applied and where before any treatment begins.
The three most common residential spiders in the Brunswick area are cellar spiders (Pholcus phalangioides), common house spiders (Parasteatoda tepidariorum), and wolf spiders (family Lycosidae). Cellar spiders build loose webs in basements and corners; common house spiders position near windows and light sources where flying insects pass; wolf spiders are large ground hunters that often startle homeowners but are not medically significant. None of these are dangerous, but all three signal active insect pressure in the home. If you find a spider you can’t identify, Pest Shield has entomologist Jeffrey Allwine on staff for species-level identification when field ID isn’t conclusive.
A sudden increase in spider activity almost always means the insect population in or around your home has grown — spiders follow their food source. In Brunswick, fall is the most common trigger: as temperatures drop, insects move indoors seeking warmth, and spiders follow. Older homes with gaps around foundations, crawl space vents, or utility penetrations give both easy access. Changes in the surrounding environment — a neighboring lot cleared, a wet summer that boosted insect populations, or vegetation growing close to the foundation — can also shift insect pressure toward your home and produce a noticeable uptick in spider activity. Sustained mosquito pressure in Brunswick during wet summers is one example of how seasonal insect surges can ripple into higher spider counts indoors.
No. Pest Shield’s exterior perimeter treatment — which is the primary approach for spider and general insect control — doesn’t require you to be home. The Standard Care Plan is specifically designed around complete exterior treatment with little to no interior work required, so scheduled visits can proceed without disrupting your day. For the initial inspection, it’s helpful to be present so Troy can walk through what he finds and answer questions, but that’s your call. Pest Shield will confirm the visit and follow up afterward to let you know what was done.
