Mosquito tips for the rest of Summer

Anna Iversen, BCE

PCO Technical Service Manager, Control Solutions Inc.

For residential adult mosquito control, many applications include an ultra-low volume (ULV) fog or mist for the main area of the backyard and a barrier spray along the perimeter. These two applications serve different, but complementary purposes:
▶ The fog or mist puts tiny droplets into the air that take time to fall out. They’re designed to come into contact with flying mosquitoes. To see the biggest impact from your fogging, apply when the mosquitoes are most active. For most species, this is dusk and dawn.
▶ The perimeter barrier spray employs heavier droplets that don’t stay in the air. Instead, they’re aimed at shrubs, bushes and trees that mosquitoes might rest on. Mosquitoes are prone to drying out, so they often rest on the underside of the leaves, out of the sun. Aim your barrier treatments so the undersides of the foliage are treated.
For greater impact, use insect growth regulators (IGRs) along with more traditional pyrethroids to combat resistant populations and target juvenile stages.

Dr. Freder Medina, BCE

Technical Market Manager, Professional & Specialty Solutions, BASF

Microencapsulated insecticides are ideal for mosquito control in and around structures, landscape and turf areas. For technicians, it supports flexible, label-driven outdoor use patterns while helping deliver consistent adult knockdown and residual.

Microencapsulation helps protect the active ingredient and improves pickup as mosquitoes come in contact with treated foliage and exterior surfaces like home siding. Use this formulation within an integrated pest management (IPM) program to eliminate standing water, correct drainage and focus treatments on adult resting sites such as the undersides of leaves, shaded vegetation, fences and building perimeters.

Mix only what you’ll use that day and follow label rates. Add product to the tank per label order and maintain agitation for a uniform suspension. For mist blowers, calibrate flow and droplet size for even coverage of harborage areas without runoff. Avoid high wind and temperature inversions.

Rainfastness depends on dry time, so schedule applications for when deposits can dry before rainfall, and prioritize protected surfaces when the weather is uncertain. Residual typically holds longer on shaded, less-exposed, nonporous substrates such as siding and soffits, rather than on sun- and rain-exposed foliage. Adjust timing by mosquito pressure and the label.
This performance profile supports customers on 21-day service intervals by helping maintain adult contact control between visits, with fewer “stay-off-lawn/area closure” constraints when applied per the label.

Dr. Jamel Sandidge, BCE

National Director of Technical Services, Nisus

Have you ever noticed that, even after a pesticide is applied for mosquitoes, they still fly into and land in the treated area, often continuing to bite people? The reasons for this are as biological as they are chemical. It is critical to understand how the pesticides you choose to use impact target pests.

“Repellent insecticides” used in the industry are not true repellents in the most technical sense. A true repellent is active in the vapor phase and causes insects to move away from the source at a distance without requiring surface contact. When a mosquito flies into a true repellent zone, such as one created by an aromatic botanical pesticide, it is immediately repelled by the vapor from a distance.
The synthetic pyrethroids commonly used in mosquito control function differently because they are excito-repellents. For excito-repellents to work, insects must physically contact the treated surface, and the neurological effects take a few minutes to kick in. This mechanism also means that mosquitoes may continue to enter treated zones because they only detect the pesticide after contact and after time has elapsed.

If you want to increase your success against mosquitoes, try different methods. Add a true repellent to your mosquito service by incorporating an aromatic botanical pesticide. You also can widen the zone of coverage for synthetic pyrethroids away from the structure, which can significantly reduce bites and callbacks by keeping mosquitoes farther away.

Tommy Powell

Technical Field Specialist, MGK

Setting the right expectations can make the difference between a profitable mosquito customer and an unprofitable one. During your inspection, look for all water sources around the structure so you can explain where the mosquitoes are potentially coming from. After you’ve completed a treatment, talk to the customer about what was treated and what was not. In the spring and early summer, lots of shrubs and plants are flowering. These are areas we should avoid treating to protect pollinators.

Also, remember that some trees and shrubs may not fully be on your customer’s property. Talking to the customer will help you set the right expectations. If some mosquito resting spots are not on their property, there’s a potential opportunity to gain a new customer. The bottom line, however, is that the more vegetation that is treated around your customer’s structure, the better the reduction will be.

Andrew Fisher, BCE, PHE

Business Unit Specialist, Neogen

A thorough inspection is integral to successful mosquito management. Evaluating the service area prior to application allows you to identify factors that may compromise treatment coverage, disrupt operations or contribute to ongoing mosquito development. This step ensures applications are both targeted and efficient while reinforcing a safety-first approach. During inspection, assess the property for conditions that influence access, application quality and mosquito breeding potential. Key elements to evaluate include:
▶ Outdoor furniture, toys, recreational equipment and other movable items
▶ Potential safety hazards
▶ Dense vegetation that may limit access or reduce product penetration
▶ Standing water sources
▶ Water-holding items such as tarps or tire swings
Because mosquitoes can complete larval development in as little as 0.25 inch of standing water, even minor water sources must be identified and addressed. Incorporating detailed inspections into routine protocols improves treatment accuracy, supports source reduction efforts, and ensures service delivery is aligned with site-specific environmental conditions.

Nick Godfroid, BCE

Technical Specialist, Rockwell Labs

Mosquitoes rely on one of the most sophisticated sensory systems in the natural world to track hosts from a distance. Among these are chemoreceptors, which are the biological mechanisms that allow them to detect and interpret scent. As pest management professionals (PMPs), we can leverage this sensitivity to our advantage.

Products that release active ingredients in a vapor phase are particularly effective at disrupting mosquito sensory function. One of the most common options is spray formulations containing botanical actives, which create a repellent effect within the airspace surrounding the treated area.

Another option is to install stationary prallethrin vapor dispensers. While these tend to have a more limited range, they can be useful for establishing localized repellent barriers, such as around patio furniture. Used alone or in combination with pyrethroids (excito-repellents), these products help create an environment where mosquitoes struggle to locate hosts and are more likely to die upon contact with treated surfaces. The result is a practical “no-fly zone” — an ideal setup for enjoying a backyard summer barbecue without the nuisance of mosquitoes.

Mel Whitson

Director of Sales and Marketing, Pest Control, Zoëcon

Most mosquito callbacks trace back to a single oversight: treating adults while ignoring the source. Larviciding targets mosquitoes before they emerge and is one of the most cost-effective and proactive steps a technician can take.

The larval stage is the most controllable point in the mosquito life cycle. Larvae must surface to breathe, making them highly vulnerable to IGRs. Products containing (S)-methoprene work by preventing larvae from developing into biting adults, suspending development at the pupal stage before the problem ever reaches your customer.

Common breeding sites to consider when applying larvicides include rain gutters, catch basins, bird baths and septic seepage areas that can each hold enough water to produce a new generation. Pairing larvicides with adulticides and an emphasis on source reduction creates a more complete IPM strategy — and fewer callbacks.

Shawn Mullen

Entomologist and Mosquito Management and Specialty Business Manager, Envu

Mosquito control is most effective when strategies support both consistent results and consistent service opportunities. With this in mind, look for mosquito control stations that are simple to install but built for scheduled upkeep. This ensures reliable performance over time because these products lean into mosquito biology during the breeding cycle. Rather than just killing a female if she goes into the station, these stations work by attracting egg-laying females and using them to transfer active ingredients to additional breeding sites. This turns mosquitoes into carriers of their own control and reduces populations across a wider area. Look for a station that delivers full backyard control by leveraging an always-on autodissemination approach to extend coverage and take control a step further.

By continuously working as mosquitoes visit and move among breeding sites, these solutions can expand coverage while maintaining steady population suppression. Plus, the devices give PMPs a consistent reason to return and service customers month after month.

Dr. Tim Husen, BCE, PHE, PCQI

Technical Services Manager, Syngenta

Educating customers on the “who, what, when, where, why and how” of your mosquito reduction program is imperative for a successful approach.

Let your customers know who is bugging them. Different types of mosquitoes fly farther, breed in different places and feed at different times of the day. Keying in customers to pest diversity can help dial their expectations into reduction rather than eradication.
Outline what your customers can do to reduce mosquito pressure on their properties. Walk them through your inspection report and focus on any environmental, pollinator or structural safety risks observed. Focus on attainable sanitation and habitat modification requests.

Proactively answer questions, such as when the treatment will begin working or when they can use the backyard again.
Review and provide detailed service records that accurately describe what you did and where you did it.
Educate customers on why you’re using certain products and equipment for your service, and why you’re only applying to specific sites.

Lastly, always remind customers how they can get in contact with you if they have further questions or concerns.

Ed Dolshun

VP of Business Development, Catchmaster Pro

When I look over my property, I have to think like a mosquito to effectively reduce pressure. My house has a raised deck and a front porch, both of which are notorious for providing the humid, cool, protected areas mosquitoes need to thrive.

I start with source reduction. Mosquitoes need very little water to reproduce, so I inspect every tarp, gutter and flowerpot for standing water. If it can hold a hidden pocket of water, I stack it off the ground or seal it.

Next, I tackle airflow. I thin out mature shrubs encroaching on the house to eliminate “dead air” zones. I’ve replaced mulch with river stone to ensure positive drainage. I even use mechanical mosquito devices with live flowers to mimic the damp, dark harborages mosquitoes seek.

Seeking conducive conditions is the key to gaining the upper hand. Small habitat modifications and maintenance now will have a substantial impact as the season progresses.

Richard Cruz, ACE

Senior Sales Representative, VM Products

Mosquitoes don’t just thrive in obvious standing water. They often hide in overlooked environments where moisture and organic material are present. In larger metropolitan areas, buildings can insulate conditions, allowing mosquitoes to survive in basements, underground parking garages and in similar spaces when water and a food source are available. Cemeteries are another common hotspot, where decaying flowers, water-filled vases, and low-lying areas create ideal breeding grounds.

Even everyday locations can pose a risk. Researchers have identified mosquito larvae in the liquid reservoirs of gas station windshield washing stations. Around homes, poor sanitation also can contribute — especially uncollected pet waste and unmanaged compost piles that provide the organic matter mosquitoes prefer. Crawlspaces are another concern; when water accumulates and forms puddles, it creates a hidden breeding site. Identifying and addressing these less-visible habitats are essential for reducing mosquito populations and maintaining effective control.

Adult mosquitoes are not evenly distributed across a property. They collect where air movement slows down. Mosquitoes are weak fliers and lose water quickly in the sun, heat and moving air. During inactive periods, they retreat into protected microclimates: dense shrubs, low vegetation, fence lines, crawlspaces, culverts, shaded voids and the undersides of decks. These areas function as daytime resting sites where mosquitoes conserve moisture and avoid environmental stress.

Eliminating standing water helps suppress future mosquito production, but reducing immediate biting pressure depends on contacting adults resting in protected areas during the day. Focus on where airflow breaks down. Open lawns, bright patios and exposed walls often hold far fewer mosquitoes than nearby shaded edges.

A common operational mistake is treating where mosquitoes are noticed instead of where they spend most of their time. Target the calm, humid resting zones. That is where mosquito densities often are highest and where treatments typically produce the greatest impact.

Devin Duval

National Sales Manager, Arkion Life Sciences

Natural, essential oil-based sprays work by creating a repellent barrier and delivering contact kill on adult mosquitoes. Focus on thorough coverage of resting sites for optimal results. Treatment tips include:
▶ Before treatment, walk the property with clients to highlight treatment zones. Let them know pre-mown and trimmed yards provide deeper penetration.
▶ While walking the property, tip standing water from flower pots, buckets, toys, tarps and similar items. Check tree trunks or cavities where water may collect.
▶ Apply in the late afternoon or early evening, when most mosquito species are active and temperatures are cooler.
▶ Apply when no rain is in the immediate forecast and winds are light. This ensures adhesion and minimizes drift.
▶ Calibrate your backpack or handheld sprayer for small, uniform droplets. Shake mixtures frequently to maintain emulsion.
▶ Use a fine mist or fog. Target foliage undersides, shrub bases, tall grass, soil-line perimeters and leaf litter. Use slow, sweeping motions for even distribution.
▶ Per the label, treat soggy or moisture-holding areas of the property, even grassy sections without dense vegetation, because mosquitoes can breed or rest in damp environments.