- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield has been removing hornet nests across Mt. Airy and the surrounding Frederick and Carroll County communities since 2011, licensed by the Maryland Department of Agriculture (MDA #30263) and led by certified applicator Troy Yowell (MD #19058). Stinging insects are our most heavily reviewed service category, with hornet jobs documented across same-day, after-hours, and Sunday calls. Pest Shield holds a 5.0 rating across 338+ Google and HomeAdvisor reviews and has been voted Best of Nextdoor four consecutive years (2021–2024) and Best of Frederick Pest Control (2021).
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 hornet calls start the same way — someone spots a papery gray nest hanging from a soffit, finds hornets entering a gap in the siding, or has a frightening encounter near a doorway or shrub. By late summer in Central Maryland, colonies have reached peak size, and the workers defending them have become significantly more aggressive than they were earlier in the season.
What to look for around the house:
Two species drive most of the hornet work in this area. Bald-faced hornets (Dolichovespula maculata) build the visible aerial nests you’ll see in trees, on soffits, and under eaves. European hornets (Vespa crabro) are larger, nest inside hollow trees, wall voids, and attic spaces, and are the species most likely to be missed until the colony is well established. Both defend their nests aggressively and can sting repeatedly — a serious concern in households with sting allergies, small children, or pets.
Mt. Airy’s wooded residential lots, mature tree canopy, and mix of older homes with wood soffits and newer construction with utility penetrations create plenty of nesting opportunities. The agricultural surroundings and tree cover throughout Frederick and Carroll counties support large hornet populations through the warm months, with the August-through-October window producing the most calls. Trying to knock down or spray a nest without proper equipment typically makes the situation worse — the colony floods out, and stings follow.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
Troy of Pest Shield was the only pest contractor willing to provide services to take down a basketball size hornets nest. All other contractors said it was too high being at a 3rd floor townhouse rafter. Troy was on time, profession and very efficient. He was also very respectful and polite. I couldn’t believe how reasonable Pest Shields rates were! Awesome job Troy! Thank you!
Beverly King · August 2023 Read on Google →
I called Pest Shield when we needed something done right away. We have a hornets nest and a wasp nest in bad places, three days before having a large gathering. Troy had a busy schedule, but agreed to come after 5:00 that evening. He got here shortly after 5:00, was friendly, thorough and professional, and took care of the nests (and two more we found). He explained everything, showed me what he could, and left excellent and detailed information. I’d hire him again any time we need that sort of service, and would definitely recommend Pest Shield.
Kai Hagen · July 2017 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 →
General pest & rodent control
Hornet removal is a single-visit service. Troy or one of our technicians comes to the property, locates the nest, treats it directly, and stays on-site to handle foragers returning to the nest entrance. Most jobs are handled same-day or next-day, and Troy has been documented arriving within hours of a call — including weekends and after normal working hours when the situation warrants it.
What the visit involves:
Pest Shield’s hornet removal carries a seasonal warranty. If hornets return to the treated area, we come back at no additional charge — Troy has been on record telling customers, “if this doesn’t get it I will be back no charge.” The nest itself doesn’t always need to be physically removed; once the colony is dead, the structure becomes inactive and won’t be reused by hornets the following year. If a nest is in a location where removal makes sense — say, a high-traffic doorway — that can be discussed during the visit.
On safety: treatments use EPA-approved products applied directly to the nest, with eco-friendly options documented across customer reviews. The application is targeted, not broadcast — chemicals go into the nest, not across the yard, the garden, or surfaces inside the home. We’ve handled hornet work at homes with severe sting allergies, small children, and pets without incident. The bigger safety issue is almost always the nest itself, not the treatment.
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.
Mt. Airy sits along the Frederick–Carroll County line, with Route 27 cutting north–south through town and I-70 just south along the Parr’s Ridge crest. The surrounding landscape is a mix of wooded residential lots, working farmland, and older neighborhoods built into the hillsides — the kind of setting that supports strong hornet populations through summer and fall.
Older homes with wood soffits, fascia gaps, and chimney chases give bald-faced hornets visible nesting spots under eaves and European hornets enclosed cavities inside walls and attics. The heavy tree canopy across Mt. Airy, Woodbine, New Market, and Damascus also supports tree-cavity colonies that go undetected until workers start entering nearby structures. By late August, those colonies are at full size — which is when most of our hornet calls come in. For broader pest control in Mt. Airy, our team handles the full range of stinging insects and other seasonal pests throughout the area.
Same-day or next-day, in most cases. Hornet work is treated as a priority because the situation can escalate quickly, especially in late summer. Troy has been documented arriving within hours of a call across Mt. Airy and the surrounding Frederick and Carroll County area, including evenings, weekends, and Sundays at no extra charge when the situation warrants it. Call (301) 829-0060 and we’ll give you a real arrival window.
Bald-faced hornets are large, black with white markings on the face and body, and build the gray football-shaped paper nests you see hanging from soffits, eaves, and tree branches. European hornets are larger still — brown and yellow, roughly an inch long — and nest in enclosed spaces like wall voids, hollow trees, and attics. Yellow jackets are smaller, bright yellow and black, and typically nest in the ground or in low cavities. The treatment approach differs by species and nest location, which is why locating the actual nest matters more than identifying the insect.
For active nests in late summer, the answer is almost always no. Bald-faced hornets and European hornets both defend their nests aggressively and can sting repeatedly. Disturbing a nest without the right protective equipment and the right product floods the colony out and turns a contained problem into a swarm — and stings to anyone nearby, including pets. Store-bought sprays usually don’t penetrate deep enough to kill the queen and the brood, so the colony rebuilds within days. If there’s any chance someone in the home has a sting allergy, DIY removal is a serious risk.
We come back at no additional charge. Pest Shield’s hornet removal carries a seasonal warranty — if activity returns to the treated nest area, the follow-up visit is included. The next-day phone or text check-in after treatment is standard practice and catches most issues early. In practice, a properly located and properly treated hornet nest stays inactive; the warranty is there for the cases where a hidden secondary nest or a returning foraging group needs another pass.
Usually not. Once the colony is killed, the nest is inactive and won’t be reused — hornets build new nests each year rather than returning to old ones. An aerial nest in a tree or under a high eave can be left in place and will weather away. Nests in high-traffic areas like doorways, low eaves, or porch ceilings are worth removing, and we can discuss that during the visit. Nests inside wall voids and chimneys are typically left in place because opening the structure to remove them creates more problem than it solves.
