Pest control services SEACOAST NH & SOUTHERN MAINE

GSC Pest Management, Inc. has been providing residential and commercial pest control services for homes and businesses in the Seacoast NH and Southern Maine areas for generations. GSC employs a systematic pest management strategy called Integrated Pest Management, which practices prevention, avoidance, monitoring, and suppression. When chemical pesticides are necessary, a preference is given to materials and methods which maximize public safety and reduce environmental risks.

The pest control profession is constantly changing and improving through new technologies and discoveries. Each year, an astounding array of new equipment, safer materials and more effective methods are developed. To be successful in this field requires a willingness to embrace change without letting go of your core values and attributes of dedication, commitment and excellence. At GSC Pest Management, we are always learning and evolving to provide our customers with the best possible service. Whether you need help with a current infestation or want to prevent one from happening in the first place, we are here to help. Give us a call today to see how we can help you protect your home or business from pests.


Servicing the Seacoast NH areas and Southern Maine.


A highly effective and efficient way to protect your home from unwanted invaders, including carpenter ants, pavement ants, wasps, hornets, earwigs, spiders, springtails, stink bugs and more (some limitations to the control of flying insects apply). It puts up a wall of defense and protects any structures that might otherwise be vulnerable to pest infestation. By receiving two barrier treatments a year, one in the spring and one in the fall, pests can be effectively controlled for the entirety of their active season.

GSC offers a proactive pest control program called the Say NO to Bugs (SNOB) Program for qualifying properties that receive the spring and fall barrier treatments. Subject properties can benefit from stress free no charge follow up services for the whole year. Additionally, qualified SNOB customers receive a
20% discount for treatments to control yellow jackets and bald face hornet nests that may develop on your home.

Barrier treatments consist of a broad base application along the exterior foundation of your home, paying special attention to pest vulnerable areas such as under decks, additions, or areas with wood-soil contact. The treatment is applied 3 feet up and 3 feet out from where the foundation meets the ground. A barrier treatment provides up to 3 months of protection from invasive insects, at which point the
chemical naturally begins to breakdown.

Barrier treatments are offered for commercial properties, residential homes, condominiums, and multi-unit apartment buildings.
Barrier treatments do not provide control for rodents, termites, fleas, bed bugs, roaches, and stored food pests, please inquire for more.


Yard treatments are effective at controlling mosquito and tick activity around the structure or recreation area. By applying a residual adulticide to the lawn and woodline where mosquitoes like to rest, the day-time nuisance from mosquitoes can be effectively controlled for 3-4 weeks. After dusk and before dawn mosquitoes fly in from nearby breeding sights without contacting the treated area and cannot be as
effectively controlled. Ticks do not fly and are slow to recolonize a treated area therefore one treatment in the spring and another in the early fall will just about eliminate tick activity.

Contact us about setting up monthly or seasonal services.


Wasps, yellow jackets, and bald faced hornets emerge every year in the late spring and begin creating an entirely new nest from scratch. Unfortunately, the locations of their nests are often problematic if they are close to human activity. By July these nests will have already become well established and have grown to about the size of a softball. This is a good time inspect your property for any nests as they will be noticeably active and are still at a manageable level. Common places to look would be eaves of your home, rock walls, under decks, by window trim, electrical meters, nearby trees, propane tank covers, mailboxes, and light posts.
In many cases with yellow jackets, they like to make their nests inside small openings of eaves or siding. This can make them increasingly hard to spot as you will only be able to see them as they enter and leave from that opening, and increasingly more difficult to treat. Please contact GSC to provide safe and
effective treatment options.

Before attempting to treat a nest yourself please read the following,

  1. If you see Yellow Jackets going in and out of a small opening DO NOT seal them in with caulking or spray foam. This will often force them to find another way out which typically includes around light fixtures, windows, or even through drywall.
  2. If you hear a consistent crackling/chewing accompanied with a wet spot/soft spot in a ceiling or wall, this could be an indication of a Yellow Jacket nest. The best thing to do is to tape over the area and call GSC for best treatment options.
  3. Wasp and hornet nests are not active at night, so this can be a good time to treat if you do not possess a full protective bee suit. Use red light to help you to see where you are treating, wasps and hornets cannot see red light, and always where proper PPE. (Personal Protective Equipment)

Every rodent control program begins with an initial inspection for rodent activity. Our technicians inspect common problem areas including attics, basements, garages, and unfinished areas where rodents are likely to be found. Once the rodent activity level is determined, we set up a combination of traps and baits to monitor and control the rodent population. The next step in the process is exclusion. Our technicians inspect around the foundation of the home pinpointing any areas rodents may be gaining entry and seal them shut. GSC Pest
Management does only minor exclusion tasks, for anything requiring structural repairs we will recommend finding a local contractor.

After the initial service we will typically recommend a follow up service in 1 month to properly gauge rodent activity levels. Once that is determined we can set up a control plan which flexes with your needs and your budget.

Ask us about our Rodent Flex and Seasonal Programs


Cockroaches are insects that have adapted well to the human environment. Our homes and restaurants provide warmth, hiding places, and a multitude of food sources. This pest is most often introduced by hitch hiking onto the items we bring into our homes like grocery bags or carboard boxes or even
appliances. It is almost impossible to identify the source of how they came to be in your home, but what is important is the early identification and treatment of any roach activity. This pest is secretive by nature and therefore can be hard to identify early on. Common areas to check initially are by appliances that give off heat or have a build up of food grease or residue such as refrigerators, stoves, toasters, or microwaves.

If you believe you may have an active roach issue, call GSC to set up an inspection.


Fabric pests such as Indian Meal Moths and Carpet beetles can cause extensive damage to any items that contain natural fibers. This includes any items made from wool, fur, silk, feathers, or leather. They do not feed on cellulosic fibers (fibers derived from plants) such as cotton or linen, and synthetic fibers such as polyester or nylon. These pests are cryptic by nature, preferring to feed in dark undisturbed
areas, and can often develop into serious infestations before ever being detected. Identifying all possible food sources is key to the control and elimination of these pests.

Common infested items include; Persian or wool rugs, animal trophies, sweaters, fur coats, blankets, decorative items, and down pillows or comforters.


Flea infestations are most commonly introduced through the pet (but not always). They can be picked up at pet groomers, dog kennels, or even by walking through yards. Wild animals such as racoons and rabbits that might be nesting in the area can “seed” fleas into an environment, which can then affect an
untreated pet.

The success of any flea control program starts with the pet. Before any treatment plan can begin, the pet must be treated for fleas. Thankfully, today there are multiple options available for treatment, whether it be flea collars, pills, or shampoo. With these new innovations in flea control, instances and
outbreaks have dropped considerably. In addition to treating the pet the pet owner should also wash pet bedding and VACUUM thoroughly, especially in areas where pets rest or sleep. By vacuuming you are removing many of the flea eggs and larvae before they develop in your home. Pay special attention to carpets, gaps along wood flooring, beneath furniture, and cushions.

Depending on the extent of the problem and how long it has been going on for, treatments of the home may still be necessary for more immediate remediation.


Bed bugs have made a major comeback not just in the U.S. but worldwide. This can be attributed to a combination of factors including the restriction of potent pesticides, and an increase in global travel. Bed bugs are often transported in luggage, furniture, and belongings. Even new furniture is not invulnerable to bed bug infestation. Oftentimes this furniture is delivered on trucks that may contain other infested items which can then spread to new items. Unlike cockroaches and flies that feed on filth, there is often no relationship between bed bugs and cleanliness, anyone can be subjected to a bed bug infestation. Although bed bugs are not linked to transmitting any diseases, they do cause a considerable
amount of emotional stress.

When searching for signs of a bed bug infestation, begin close to the bed or couches, anywhere you spend an extended period of time. Bed Bugs like to live within 5-20 feet of their food source, especially during the early stages of an infestation. Box springs, bed frames, mattresses and couches are the primary areas to look when trying to identify an infestation. Pulling back on folds or seams along the bedding or cushions will often reveal their hiding areas.

To affectively control and eliminate a bed bug infestation will require a high degree of communication and cooperation. Treatment alone will not eliminate a bed bug infestation.

Check out this video for more information about bed bugs


There a many different types of flies, each with their own unique life cycles and potential food sources. Depending on the specie the source could be from a drain, an animal carcass, or a flowerpot just to list a few.


There are several types of stored product pests that are able to infest different types of whole grains and processed foods. The first signs of an infestation are typically the emerging adults the appear crawling out of cabinets or flying across the kitchen. While removing the adults is helpful, this problem
will not go away until you find the food source. Proper identification of the pest will help to provide you with a hint as to what this food source might be. Indian meal moths prefer course flours and corn meal, but can also be found in dried fruits, chocolate, dried dog food, and even bird seed. While drugstore beetles have a much broader diet and can infest almost any household food or spice, often found in bread or flour but can also be found in such spices as paprika or red pepper.

The key to preventing future infestations is proper food storage. Items should be sealed in airtight plastic containers or jars; cardboard and paper will not effectively keep out stored food pests.


Termites can be the cause of major concern for homeowners, often termite activity can go on for years before it is detected. The first signs typically noticed by homeowners is the swarming winged alates in the early spring. This is also the cause for a lot of misidentifications. Carpenter ants also have a similar swarming pattern in the early spring, so it is important to get proper identification and a second opinion before any treatments are scheduled. 

For the control of termites, GSC offers both liquid applications and baiting systems, with annual renewal inspections. Treatment options vary by structure and environmental factors in your area.

To reduce the chances of a termite infestation it is important to;

  1. Eliminate all would soil contact (at least 6 inches of separation)
  2. Pull back mulch from the structure
  3. Not allow moisture to accumulate near the foundation
  4. Reduce moisture and humidity in crawlspaces
  5. Keep any stored firewood off the ground and away from the structure

When it comes to the control for minor pest activity, a full service program or treatment of the entire structure may not be necessary or warranted. Spot treatments are a one time localized application for the control of a specific pest. Follow up treatments may be necessary.


Inspection of a home or property for the presence of wood destroying insects (WDI). GSC Pest Management does not perform home inspections that are for the purchase or sale of a home (no realtors). GSC Pest Management will do the inspection if it is for a refinance or other various reasons.


Residential Pest Control

 Say NO to Bugs (SNOB) is a residential program for the control of invasive insects. To be eligible for the SNOB program, the structure you want to protect must be well constructed and well maintained. Given those conditions GSC will apply barrier treatments around your foundation in the spring and in the fall. This entitles you to receive follow up service calls at no charge. Homeowners with an average size (3,000 S.F.) home can enjoy a program that includes no charge follow up
service for less than $500 per year. SNOB customers also receive a 20% discount on wasp and bee services.

Barrier treatments are one of the most efficient and effective ways to control invasive insects no matter what age or condition your home may be in. After a barrier treatment a non-SNOB customer is eligible to receive a follow up service within 30 days from the treatment date at no cost. 


Automated monthly yard treatments can take the hassle out of scheduling your mosquito and tick control. Treatments scheduled every 3-4 weeks will affectively control the daytime nuisance of mosquitoes even in high activity areas.


For customers more concerned with the control of ticks, treatments are automatically scheduled for early spring and fall.


Rodent activity typically fluctuates with the seasons, which is why we offer rodent services that flex with them. Rodents move indoors seeking food and shelter during the months of September through March. This is when you want to make sure your rodent program is set up and ready to meet them. The level of protection required will vary by structure and the surrounding environment. GSC offers multiple levels of
protection, so you don’t have to pay for unneeded services.

    1. Winter Monthly Program (7 services a year)
    2. Winter Bi-Monthly Program (4 services a year)
    3. Winter Quarterly Program (3 services a year)

We understand the importance of maintaining a safe living and working environment for you, your residents, and your employees. Every commercial pest control program is specially designed to fit the needs and requirements of your specific industry. Our flexible service intervals ensure you don’t overpay for pest services that you don’t need.

We offer commercial programs for industrial warehouses, elderly living facilities, medical facilities, apartment complexes, and more.


The REM program is an extension of the integrated pest management strategy to prevent and control pest activity by attacking the underlying causes that contribute to an infestation both inside and outside of your home. If the underlying causes of a pest infestation are not corrected there is a good likelihood the problem will reoccur. The REM program focuses on physical habitat alterations by reducing or eliminating pest harborage areas, or areas that may be conducive to a pest infestation. By reducing or eliminating these areas around your home, we hope to lessen the use and need of pesticide applications for the control of pests.

Such services would include:


  • Brush hogging
  • Clutter removal
  • Trim/remove shrubbery
  • Exclusion
  • Crushed stone borders


  • Insulation removal
  • Clutter removal 
  • HEPA vacuuming
  • Cleaning & Sanitation
  • Weather seal replacement

EEM Programs are scheduled from November until March.