- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. (MDA #30263) has provided licensed rat control across Frederick County since 2011, with owner Troy Yowell personally handling the majority of service calls throughout the region. The company’s team brings over 75 years of combined pest management experience, including on-staff entomologist Jeffrey Allwine for species-level identification when field assessment isn’t conclusive. Pest Shield holds a 5.0 rating across 338+ reviews — earned in large part by doing honest assessments and recommending only what’s actually needed.
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.
Rats don’t announce themselves — they work at night, stay close to walls, and avoid open spaces. By the time most homeowners notice something is wrong, the infestation is already established. Here’s what to look for:
One rat is rarely one rat. Norway rats — the primary species in Central Maryland — live in colonies, and a single confirmed sighting typically means others are nearby, often in a burrow system close to the structure.
Middletown’s geography compounds the problem. The town sits in the Middletown Valley between South Mountain to the east and Catoctin Mountain to the west — a natural corridor for wildlife movement that brings rodent pressure close to residential areas year-round. Agricultural fields on the valley floor push rats toward homes and outbuildings during and after harvest, when food sources in the fields disappear. As temperatures drop in fall, that pressure intensifies sharply: rats seek warmth, and they can enter through openings as small as a half-inch. Older homes in Middletown’s historic core — many with stone or block foundations that have settled and shifted over decades — offer exactly the kind of gaps and voids that rats exploit. A single treatment that doesn’t address entry points leaves the underlying vulnerability in place.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
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 →
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 →
Mice!! We moved into our new home only to find it infested with mice. Contacted Home Advisor and they sent me Troy from Pest Shield and less than 30 days later…..no mice. Troy is a very genuine and honest guy. He wont try to over-sell you on things that you don’t need and his goal is to rid you of the problem ASAP. He was very prompt and followed up as promised 30 days after the first visit. Prices are reasonable and his services for mice were covered for a full year with one payment. Look no further, these are the guys you want taking care of your pest!! Thanks Troy!!!
Robert R · March 2014 Read on HomeAdvisor →
General pest & rodent control
Pest Shield’s approach starts with a free property inspection — no treatment recommendation before Troy or a technician has assessed the property, identified how rats are getting in, and evaluated the scope of the infestation. That inspection covers the exterior perimeter, foundation gaps, crawl spaces, attic access points, decking, and any other structural vulnerabilities specific to your home. Troy takes the time to explain what he finds and what it means before any work begins.
Treatment follows the inspection findings. Pest Shield uses professional-grade baiting products — not glue traps — placed in attics, basements, and other areas where rats are active. As one customer put it after comparing Pest Shield to competitors: Troy used “top notch products, instead of just sitting out glue traps.” The approach is exterior-first wherever possible, keeping chemical products out of the home’s living areas. Pest Shield’s exterior-first methodology is well-documented: one longtime customer noted that “Pest Shield doesn’t even come into the house” — the treatment targets how rats access the structure, not just where they’ve been seen inside it.
A follow-up visit is scheduled after the initial treatment — typically at the 30-day mark — to confirm eradication and seal entry points from outside. Sealing entry points after confirming results (rather than before) is deliberate: it ensures the treatment has done its work before closing off access routes. Multiple customers have documented complete eradication within 30 days of the initial visit.
One thing worth knowing: Pest Shield has been called in repeatedly as a second opinion after other companies recommended expensive attic insulation removal for rodent infestations. In documented cases, Troy inspected the attic, found minimal evidence of activity, and told the homeowner they didn’t need the $3,000–$5,000 treatment they’d been quoted. Honest assessment is part of the service — if the situation doesn’t warrant a particular treatment, Troy will say so.
For homeowners who want continued protection after the initial treatment is complete, Pest Shield offers the Standard Care Plan: treatment every 60 days on a bi-monthly cadence, complete exterior treatment focus, and a 100% effective guarantee with free retreatment between scheduled visits if pest activity reappears. You don’t need to be home for scheduled visits. The plan is offered when it genuinely makes sense — not pushed as a default. Products used are EPA-approved, and the exterior-first approach minimizes interior chemical exposure for homes with children and pets.
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.
Middletown sits in the heart of the Middletown Valley, flanked by South Mountain to the east and Catoctin Mountain to the west along US-40 and MD-17. The town is roughly 7 miles southwest of Frederick and within Pest Shield’s primary Frederick County service area. Nearby communities including Myersville, Wolfsville, and Jefferson fall within the same service corridor, and Pest Shield’s MDA-licensed technicians serve the full valley and surrounding foothills.
The valley’s agricultural character — grain fields, orchards, and pasture land — creates seasonal rodent migration patterns that directly affect residential properties. When fall harvests end and fields are turned, rats that fed on grain and crop debris move toward structures for warmth and food. Middletown’s older housing stock, including homes with stone and block foundations common in the historic core along Main Street and the surrounding neighborhoods, tends to have settling gaps and aging sill plates that provide ready entry points for Norway rats seeking winter shelter. Homeowners dealing with recurring rodent pressure often benefit from pest control in Middletown that addresses the full range of seasonal pest activity alongside targeted rat treatment.
The clearest indicators are size and droppings. Norway rat droppings are roughly ¾ inch long, capsule-shaped, and blunt at both ends — significantly larger than mouse droppings, which are smaller than a grain of rice with pointed tips. Rats also leave gnaw marks that are noticeably larger and deeper than what mice produce, and burrow entrances near the foundation (2–3 inch diameter holes) are a Norway rat signature — mice don’t burrow. Sounds matter too: rats moving through wall voids and ceiling cavities tend to produce heavier, more deliberate scurrying than the lighter scratching associated with mice. If you’re not certain, Pest Shield’s free inspection will identify the species before any treatment is recommended — and on-staff entomologist Jeffrey Allwine is available for laboratory-level identification when field assessment isn’t conclusive.
A single treatment can eliminate an active infestation, but whether rats return depends on whether the entry points that let them in are identified and sealed. Pest Shield’s process includes a follow-up visit — typically at 30 days — to confirm eradication and seal entry points from outside. That follow-up step is what separates a resolved problem from a recurring one. For homeowners who want continued protection beyond the initial treatment cycle, Pest Shield’s Standard Care Plan provides treatment every 60 days on a bi-monthly cadence, with a 100% effective guarantee and free retreatment between scheduled visits if activity reappears. The plan is offered when it makes sense for your situation — not as a default upsell.
Entry point sealing is a follow-up service performed after the initial treatment has had time to work — typically at the 30-day follow-up visit. Troy or a technician inspects the exterior of the structure, identifies the gaps, cracks, and openings rats used to enter, and seals them from outside. Sealing after confirming eradication (rather than before) ensures rats aren’t trapped inside the structure and that the treatment has fully resolved the infestation before access routes are closed. The specific materials and methods vary depending on the type and location of the entry points found during inspection.
Pest Shield uses EPA-approved products and follows an exterior-first treatment approach that keeps chemical applications out of the home’s living areas wherever possible. Professional-grade bait stations are placed in attics, basements, and exterior locations — not in accessible areas where children or pets could reach them. Troy has documented experience working in homes with young children and pets, and proactively addresses safety considerations during the inspection before any treatment begins. If you have specific concerns about a family member with sensitivities or a pet with particular access patterns, raise them during the inspection — Troy will factor them into the treatment plan.
Same-day and next-day service are standard for active infestations — Pest Shield has been documented arriving within hours of a call, including on Sundays at no extra charge. The free inspection covers the exterior perimeter, foundation, crawl space, attic, decking, and any structural entry points relevant to the infestation. Troy explains what he finds, identifies the species, assesses the scope of the problem, and gives you a clear treatment recommendation before any work is scheduled. There’s no obligation to proceed, and if the situation doesn’t warrant treatment, he’ll tell you that directly. To schedule, call (301) 829-0060 or use the contact form on the website.
