- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. has been serving Frederick County homeowners since 2011, and owner Troy Yowell — a Maryland Department of Agriculture licensed applicator (MDA #30263, MD Cert #19058) with approximately 35 years in pest management — handles the majority of stinging insect calls personally. The company has earned 338+ five-star reviews across Google and HomeAdvisor, with stinging insect removal among its most heavily reviewed services. Jeffrey Allwine, an on-staff entomologist, is available for species identification when field assessment leaves any question about what you’re dealing with.
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.
Most homeowners notice the nest before they notice the hornets — a gray, papery structure the size of a football or larger hanging from an eave, tucked under a soffit, or suspended in a tree at the edge of the yard. Others notice the hornets first: a steady stream of large insects entering and exiting a gap in the siding, a soffit vent, or a hollow section of a mature tree. Either way, if the activity is consistent and the insects are large, you’re likely looking at an active colony — and late summer through early fall is when that colony is at its most dangerous.
Central Maryland is home to two hornet species worth knowing:
Middletown’s setting makes it favorable territory for both species. The town sits in the valley between South Mountain and Catoctin Mountain, with mature tree canopy throughout established neighborhoods and wooded lots at the edges of town. Bald-faced hornets find ideal nesting sites in the large deciduous trees and structural overhangs common to older homes here. European hornets are drawn to the hollow trees and aging wood structures that come with that same established housing stock.
The timing matters. Hornet colonies grow steadily through spring and summer, reaching maximum size in August through October. At peak colony size, workers are highly defensive — disturbance from a lawnmower, a door slamming, or even vibration from foot traffic near a ground-level nest can trigger a coordinated defensive response. For anyone with a bee sting allergy in the household, an active nest near a frequently used door, deck, or play area is a situation that warrants prompt attention. For everyone else, it’s still a job that carries real risk if approached without the right equipment and treatment approach.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
I emailed with a bald faced hornet issue. Troy called very quickly and we scheduled the next day. I didn’t have to be there. He came out and took care of the nest, stayed briefly to take care of any residual bees that were not in the nest at the time, and then called me the next day to make sure there were no issues. I have not seen any bees since he did the service. I will definitely use his services again if I ever have anymore pest issues.
Kathryn Wilson · June 2018 Read on HomeAdvisor →
Rob came to our house to take care of a European Hornet nest in our chimney. He explained what he was going to do, and took care of the problem quickly. We will surely use Pest Shield the next time we have a problem.
David Boteler · September 2023 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
When you call Pest Shield, Inc. about an active hornet nest, the first question is how fast you need someone there. Same-day service is the norm for stinging insect emergencies — Troy Yowell has been documented arriving within hours of a call, including on Sundays, and the company’s review record consistently reflects same-day and next-day scheduling for urgent stinging insect situations. If the nest is near a door your family uses daily, near a play area, or if anyone in the household has a known sting allergy, that urgency is taken seriously from the first call.
The service itself is a single treatment visit. Troy locates the nest — including in the difficult spots where hornets often establish: behind soffits, inside wall voids, in attic spaces, in chimney areas, and in exhaust vents — treats it directly, and stays on-site briefly to address foragers returning to the nest location after treatment. European hornet nests in enclosed spaces require locating the entry point before treatment can be targeted effectively; Troy’s documented experience with nests in wall voids and structural gaps applies directly here. The treatment process uses eco-friendly methods, and the visit ends with a follow-up call the next day to confirm the nest is no longer active.
A few things to know about the day of service:
The service includes a seasonal warranty against return. If hornet activity resumes at the treated location within the warranty period, Pest Shield comes back. One call, one visit, one resolved problem — and a warranty that backs it up. This is a discrete service, not a recurring plan enrollment; if general pest control in Middletown makes sense for your home, that’s a separate conversation, and Pest Shield won’t push it when it isn’t warranted.
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 Cumberland Valley between South Mountain to the west and Catoctin Mountain to the east, along MD Route 40 in central Frederick County. The town is roughly 7 miles southwest of Frederick and is well within Pest Shield’s primary service area. Neighboring communities including Myersville, Wolfsville, and Jefferson are served as well. The valley setting, combined with mature tree canopy throughout Middletown’s established neighborhoods, puts this area squarely in the range of both bald-faced and European hornet activity through the warmer months.
The specific conditions around Middletown — older home construction, wooded lots backing up to South Mountain State Forest, and the mix of agricultural land at the town’s edges — create consistent hornet pressure each season. Bald-faced hornets favor the large deciduous trees and structural overhangs common to homes built decades ago; European hornets are drawn to hollow trees and aging wood, both of which are plentiful in this part of Frederick County. Properties near the mountain foothills with significant tree cover tend to see nest establishment earlier in the season and larger colonies by late summer — and the same conditions that support hornet activity also drive pressure from wasps in Middletown and yellow jackets throughout the warmer months.
Same-day service is the standard for active stinging insect situations, not an exception. Troy Yowell has been documented arriving within hours of a call — including on Sundays — for hornet and yellow jacket emergencies throughout Frederick County. Middletown is well within Pest Shield’s primary service area, so if you call (301) 829-0060 in the morning, same-day scheduling is realistic. If the nest is near a door your family uses regularly or anyone in the household has a sting allergy, mention that when you call — it helps with prioritization.
Bald-faced hornets (Dolichovespula maculata) build the large, exposed gray paper nests most people recognize — hanging from tree branches, eaves, or soffits. European hornets (Vespa crabro) are larger, brown-and-yellow, and prefer enclosed nesting sites: wall voids, hollow trees, attic spaces, and gaps in older wood structures. European hornets are also notably active at night, which is a useful identification clue. The species does affect the treatment approach — exposed aerial nests and hidden structural nests require different access and targeting — which is one reason an accurate identification before treatment matters. If field identification isn’t clear-cut, Pest Shield has an on-staff entomologist, Jeffrey Allwine, available for species confirmation.
In most cases, no — exterior nest treatment doesn’t require you to vacate the home. You should keep family members and pets away from the immediate treatment area during the visit and for a short period afterward while the product takes effect. Troy will advise on specific re-entry timing based on where the nest is located and what was applied. For nests in wall voids or attic spaces where interior access may be needed, he’ll walk you through any additional precautions before starting work.
The primary risk is triggering a mass defensive response from a colony that may contain several hundred workers. Bald-faced hornets in particular are aggressive defenders — they can sting multiple times, they recruit other workers when threatened, and they will pursue a perceived threat well beyond the nest. Consumer sprays can agitate a colony without delivering enough product to the nest core to shut it down, which often makes the situation worse. Nests in wall voids or enclosed spaces are especially difficult to treat safely without knowing the nest’s exact location and size. Professional treatment uses targeted application at the nest itself, with the right product volume and protective equipment to manage the response — including staying on-site to address returning foragers that weren’t present during treatment.
Hornet colonies don’t reuse old nests — the colony dies off in winter, and the paper nest itself deteriorates. However, new queens emerging the following spring will scout for favorable nesting sites, and a location that worked well once (a sheltered soffit, a hollow tree, a gap in siding) can attract a new colony the next season. Removing or sealing the original nest site after treatment reduces that likelihood. Pest Shield’s seasonal warranty covers the treated location for the current season; if activity resumes within the warranty period, they return at no additional charge.
