- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. has provided ant control and residential pest management across Frederick County since 2011, licensed under MDA #30263 with over 75 years of combined pest management experience on staff. Owner Troy Yowell leads the majority of service calls personally, and on-staff entomologist Jeffrey Allwine provides species-level identification when field diagnosis isn’t conclusive — a capability most small pest control companies have to outsource. Pest Shield holds a 5.0 rating across 338+ reviews on 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.
New Market sits at the edge of Frederick County’s rural-suburban fringe — wooded lots, older slab and crawl space construction, and proximity to agricultural land create conditions where ant pressure doesn’t arrive once and leave. It arrives seasonally, from multiple directions, and from species that behave very differently from one another. Knowing which ant you’re dealing with changes what treatment actually works.
Retail ant sprays kill the ants you can see. They don’t reach the colony — which may contain tens of thousands of workers and a queen that continues producing. Spraying a trail often causes the colony to split and relocate, spreading the problem rather than eliminating it. For carpenter ants especially, surface treatment without locating the colony source leaves the underlying infestation intact. New Market’s mix of wooded lots, agricultural adjacency, and clay-heavy soils means foraging pressure is continuous — which is why one-time treatment, even professional treatment, often leaves conditions in place for re-infestation within a season.
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 →
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 →
Troy was a pleasure to work with. Fingers crossed that the ants don’t come back. Got the yearly protection plan.
John Dickerson · August 2016 Read on HomeAdvisor →
General pest & rodent control
Every Pest Shield service begins with a free inspection. Troy or a technician assesses the property, identifies the ant species and colony source, and explains what’s actually happening before recommending any treatment. If the inspection doesn’t turn up a problem that warrants professional service, that’s what you’ll hear — Pest Shield’s review record includes dozens of cases where Troy told customers they didn’t need treatment. When treatment is warranted, the approach is targeted: identify the species, locate the entry points and colony pressure, and treat at the perimeter to stop ants before they reach the interior.
Pest Shield’s general ant control program treats the home primarily from the outside. The goal is to establish a treated perimeter that intercepts foraging ants before they enter — keeping product outside and family inside. 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.” Interior treatment is available when the situation calls for it, but a properly maintained exterior perimeter rarely requires it.
For carpenter ants specifically, the inspection focuses on identifying moisture sources and wood contact points — the conditions that attract and sustain colonies. Treatment targets the colony pressure, not just the visible foragers.
A single treatment addresses the current infestation. What it doesn’t address is the seasonal pressure that produces the next one. Maryland’s ant activity follows a predictable cycle — pavement ants and odorous house ants emerge in force in spring, carpenter ant swarmers appear in late spring, and foraging pressure continues through summer. Pest Shield’s Standard Care Plan is built around this cycle:
The Standard Care Plan is offered when it genuinely makes sense for the property and the pest pressure — not as a default upsell. For some situations, a one-time treatment is the right answer. Troy will tell you which applies after the inspection.
Pest Shield uses EPA-approved products throughout. For homes with children, pets, or other sensitivities, nontoxic bio-pesticide options are available — the exterior-first approach already minimizes interior chemical exposure, and the available product options extend that safety profile further.
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 is a small Frederick County town along the I-70 corridor, roughly midway between Frederick and Mount Airy. The town’s older in-town properties sit close to mature trees and established landscaping; the newer developments on its edges back to wooded lots and, in some cases, agricultural land. Route 144 and I-70 connect New Market directly to Mt. Airy, where Pest Shield is based — same-day and next-day service to New Market is practical and well within Pest Shield’s normal scheduling range.
Frederick County’s clay-heavy soils retain moisture near foundations, which encourages ant colony establishment along slab edges and crawl space perimeters — a pattern that shows up consistently in New Market’s older construction. Wooded lots bring carpenter ant and odorous house ant pressure from decaying wood and leaf litter. Agricultural surroundings to the north and east add foraging pressure from pavement ants in spring and summer as field margins become active. The combination of these conditions means pest control in New Market tends to address multi-species and seasonal pressure rather than a single isolated event.
It depends on the species and the conditions around your home — and Pest Shield will tell you honestly after the inspection. For a single, isolated ant event with no structural conditions driving it, a one-time treatment may be sufficient. For most New Market homes with wooded lots, older construction, or proximity to agricultural land, the underlying pressure that produced the infestation doesn’t go away after one visit. Pest Shield’s Standard Care Plan — treatment every 60 days, exterior-focused, with free retreatment between visits if activity returns — is designed for properties where seasonal ant pressure is ongoing. It’s offered when it genuinely makes sense, not as a default.
Yes. Pest Shield uses EPA-approved products and offers nontoxic bio-pesticide options for homes with children and pets. The exterior-first treatment approach already keeps product outside the home in most cases, which limits interior exposure by design. For households with specific sensitivities — young children, immunocompromised family members, or pets — Troy discusses the available options during the inspection so the treatment plan fits the household.
Carpenter ants (Camponotus spp.) tunnel through wood to build nesting galleries — they don’t eat it, but the damage accumulates over time in an established colony. Signs include coarse, sawdust-like frass near baseboards or wood structural members, and winged swarmers indoors in spring. Pavement ants and odorous house ants are nuisance pests — they don’t damage wood. If you’re seeing frass or swarmers, it’s worth having the property inspected; a mature carpenter ant colony in a moisture-prone crawl space or wall void is a structural concern that gets more expensive to address the longer it’s left. Pest Shield’s free inspection will identify the species and assess whether structural conditions are involved.
Same-day and next-day service to New Market is standard. Pest Shield is based in Mt. Airy — New Market is a short drive east on I-70, well within the normal service range. For urgent situations, calling (301) 829-0060 in the morning typically results in same-day scheduling. Weekend service, including Sundays, is documented at no extra charge.
Over-the-counter sprays kill foraging workers — the ants you can see — but don’t reach the colony. The queen continues producing, and the colony replenishes within days. Spraying a trail can also cause the colony to split and relocate, spreading the problem. Professional treatment targets the colony source and entry points, not just the visible activity. In New Market, where wooded surroundings and clay-heavy soils create persistent foraging pressure, eliminating the current infestation without addressing the conditions that produced it typically results in re-infestation within the same season.
