3 Things You Must Do Before Adulticiding

mosquito sampling in lake

Effective and responsible mosquito control involves more than just spraying insecticides. Integrated mosquito management (IMM) is the modern, comprehensive approach to controlling mosquito populations and reducing the risk of mosquito-borne disease. It takes a multi-pronged and data-backed approach that uses high-impact techniques like chemical applications as sparingly as possible. For this reason, several proactive approaches are taken before insecticide applications are considered.

1. Mosquito Surveillance

It’s crucial to have a plan for controlling local mosquito populations, and any plan has to start with quality information. The process of understanding the specifics of local mosquito populations is called surveillance. This information is crucial to determining which different mosquito species are present in an area, what diseases these mosquitoes can carry, and which methods of control may be most effective. Surveillance may also be conducted post-treatment to determine whether chemical applications are having the intended effect or if populations are developing resistance. Surveillance is split into larval mosquito surveillance and adult mosquito surveillance.

Types of Mosquito Surveillance (Larval and Adult)

Larval mosquito surveillance is conducted by inspecting water sources that may provide breeding sites for local mosquito populations. These sources can be mapped, and larval samples can be taken.

Adult mosquito surveillance often relies on trapping. Traps like the New Jersey light trap or CDC light traps attract adult mosquitoes with a combination of light and a carbon dioxide source, which mimics the respiratory gases of mammals that mosquitoes use to find their hosts. Other devices like gravid traps, which specifically target Culex mosquitoes, attract adult mosquitoes with a combination of water and vegetal matter that mimics naturally occurring stagnant water. All of these traps use a fan to pull mosquitoes into a collection chamber from which they are too weak to fly out of.

CDC mosquito control traps and mosquito monitoring

Analyzing Larval and Adult Mosquitoes In the Lab

Larvae and adult mosquitoes that are collected must be analyzed in a laboratory by professional entomologists. In this setting, entomologists can identify specific mosquito species present in an area, test them for transmissible diseases, and derive other information such as population numbers. This data is then shared with all appropriate local and state health departments and is utilized to guide an effective city mosquito control plan. 

mosquito lab testing

Using Surveillance to Set Action Thresholds

Mosquito control professionals rely on action thresholds to determine when to deploy control strategies. An action threshold is used to determine when a specific mosquito species has increased within a region or a disease risk that necessitates intervention. It is only through consistent surveillance that mosquito professionals can compile the data needed to set and follow action thresholds. 

Mosquito Surveillance & Disease Testing Reduce Mosquito-borne Disease 2

2. Source Reduction: Removing Mosquito Breeding Habitats

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Prevention is key to controlling mosquito populations, and the most direct method of prevention is identifying and eliminating mosquito breeding sites, a process referred to as source reduction. 

While all mosquitoes breed in water, they utilize a wide range of breeding sites, with some species preferring specific habitats. Large, permanent or semi-permanent sources like marshes and floodplains cannot be truly eliminated, but many other sources can be. Container mosquitoes like Aedes aegypti and Aedes albopictus take advantage of discarded containers such as buckets, bottle caps and tires. These containers, although small, provide an ideal habitat once they fill with rainwater. Moreover, these two species are medically important due to the number of diseases they are capable of transmitting.  

Poor drainage can create another common and preventable breeding site for mosquitoes. This can occur in different places, including leaf-clogged gutters on homes and buildings, clogged storm drains, and improperly drained landscaping on golf courses or other outdoor areas. Property managers and homeowners can utilize smart landscaping techniques to promote proper drainage and maintain water features to help prevent mosquitoes from breeding in standing water resources.

3. Mosquito Larvicide Applications

An effective way to limit adult mosquito populations is to eliminate existing larvae. This can be accomplished with larvicides, substances specifically designed to target and kill mosquito larvae before they develop into adults. Both chemical and biological larvicides are available, with biological controls being used first when and where possible. 

Using Biological and Chemical Larvicides to Target Mosquitoes

Biological control options include introducing Gambusia affinis (the mosquitofish), which feeds on mosquito larvae, or introducing the bacterial agents Bacillus thuringiensis var israelensis (Bti) and Bacillus sphaericus (Bs), which are available in liquid, granular, and time-release applications. These options are able to control larvae populations with limited environmental impact and potential for developing insecticide resistance in the target populations. 

In some cases, biological controls are not feasible, and chemical larvicides must be used. Methoprene, an insect growth regulator (IGR), works by disrupting the growth of mosquito larvae and preventing them from developing to adulthood as they normally would. Chemical controls can be applied on foot using backpack sprayers or applied directly to water sources by hand. Aerial application over large areas or difficult terrain is also possible using airplanes or drones.

How Integrated Mosquito Management Helps Reduce Risk

As we have seen, Integrated Mosquito Management (IMM) relies on a foundation of several techniques that precede the spraying of insecticides. Surveillance, source reduction, and larviciding are all major tools that mosquito control professionals rely on to do their work in a highly targeted and considered way. This allows them to use chemical applications only when doing so is truly and demonstrably necessary.

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Contact Our Experts

Complete the form below or call us at 800-413-4445 to speak to an expert about your mosquito management needs.

VDCI_Logo_squareSince 1992, Vector Disease Control International (VDCI) has taken pride in providing municipalities, mosquito abatement districts, industrial sites, planned communities, homeowners associations, and golf courses with the tools they need to run effective mosquito control programs. We are determined to protect the public health of the communities in which we operate. Our mosquito control professionals have over 100 years of combined experience in the field of public health, specifically vector disease control. We strive to provide the most effective and scientifically sound mosquito surveillance and control programs possible based on an Integrated Mosquito Management approach recommended by the American Mosquito Control Association (AMCA) and Centers for Disease Control and Prevention (CDC). VDCI is the only company in the country that can manage all aspects of an integrated mosquito management program, from surveillance to disease testing to aerial application in emergency situations.

The Battle Against Mosquitoes: What Does “Winning” Look Like?

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Mosquitoes Are Here to Stay—So What Does Success Look Like?

Mosquitoes have existed for over 100 million years, surviving through the Jurassic Period, the Ice Age, and numerous environmental extremes thanks to their remarkable adaptability. While it’s appealing to imagine a world free from itchy mosquito bites, completely eliminating mosquitoes is an unrealistic goal. “Winning” the battle isn’t about eliminating all mosquitoes; it’s about protecting public health by reducing the mosquito population to a manageable level, thereby reducing the spread of vector-borne diseases. Historical precedent suggests this is only possible through a coordinated, integrated management approach.

Ancient Mosquito Preserved in Amber

A Historic Example of Targeted Mosquito Control

For example, in the 1950s, Anopheles gambiae, a vector of malaria, was accidentally imported from Africa to Brazil, leading to thousands of deaths. In response, Brazil launched a highly organized campaign to eliminate this invasive species. This involved daily surveys, mapping infestations, and suffocating larvae by applying oil to their preferred breeding sites—puddles, irrigated fields, and even water that collected in cattle hoof prints. Because Anopheles gambiae feeds exclusively on humans and stays close to its breeding areas, teams could systematically move from the outskirts of communities inward. This approach successfully eliminated the Anopheles gambiae from Brazil and stands as one of the most historically successful mosquito elimination programs ever instituted.

Why Short-Term Mosquito Management Programs Fall Short

Similar strategies were used in the United States in the 1960s to control Aedes aegypti, the primary vector of yellow fever. Programs combined careful monitoring, habitat management, and door-to-door community education. Residents were encouraged to eliminate standing water from buckets, tires, birdbaths, and other small containers that serve as Aedes aegypti breeding grounds. These efforts temporarily reduced their populations to near-zero numbers in some areas. Unfortunately, when the program ended in the early 1970s due to funding and commitment challenges, this mosquito species rebounded in full force.

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dumping-standing-water

These examples illustrate that mosquito population dynamics are always evolving, particularly due to increased global trade, travel,  insecticide resistance, and climate change, which are creating new areas and conditions for mosquitoes to spread. Today’s mosquito management programs build on the lessons and successes of past initiatives. They are scientifically precise, carefully tailored, and designed to achieve maximum impact while minimizing environmental effects. 

Targeting Mosquitoes at Every Life Stage

VDCI’s Integrated Mosquito Management (IMM) programs are defined by four pillars: surveillance and disease testing, larval control, adult control, and public education. By leveraging the latest technologies and targeting mosquitoes at every stage of their life cycle, these programs can help reduce mosquito populations and the risk of disease transmission. Nonetheless, true success depends on the support and cooperation of the local community, particularly in removing standing water where many urban mosquitoes breed.

4 pillars of integrated mosquito management plans infographic

The Cost of Letting Mosquito Control Lapse

Historical examples prove that when mosquito management is prioritized, populations can be effectively managed. However, they also demonstrate that if efforts lapse due to funding gaps, political changes, or public disengagement, decades of progress can be quickly reversed. Government leaders and public health officials must recognize that the battle against mosquitoes can never be truly won. It is a continuous effort that requires a sustained investment in time, resources, and community education.

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Contact Our Experts

Complete the form below or call us at 800-413-4445 to speak to an expert about your mosquito management needs.

VDCI_Logo_squareSince 1992, Vector Disease Control International (VDCI) has taken pride in providing municipalities, mosquito abatement districts, industrial sites, planned communities, homeowners associations, and golf courses with the tools they need to run effective mosquito control programs. We are determined to protect the public health of the communities in which we operate. Our mosquito control professionals have over 100 years of combined experience in the field of public health, specifically vector disease control. We strive to provide the most effective and scientifically sound mosquito surveillance and control programs possible based on an Integrated Mosquito Management approach recommended by the American Mosquito Control Association (AMCA) and Centers for Disease Control and Prevention (CDC). VDCI is the only company in the country that can manage all aspects of an integrated mosquito management program, from surveillance to disease testing to aerial application in emergency situations.

How Urbanization Impacts the Mosquito Population

What Communities Can Do to Control Mosquito Breeding in Urban Areas

Urban development changes the natural landscape, and while the effects on native plants and wildlife are often discussed, these conversations rarely include mosquitoes. It’s important to understand that whenever environmental conditions shift, mosquito dynamics can also change. And when mosquito dynamics change, new public health risks may emerge.

Hundreds of mosquito species can be found around the globe, each of which are adapted to specific ecological niches. Some, such as “tree-hole” mosquitoes, are typically found in undisturbed, forested areas where they rely on wildlife for blood meals. Others thrive in well-populated urban areas. These mosquitoes breed in standing water that collects in small artificial containers like plant saucers, old tires, outdoor pet bowls, clogged gutters, buckets, and even bottle caps.

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It’s Not About More Mosquitoes — Just Different Ones

It’s natural to assume that urban development causes mosquitoes to move from cities into rural areas, or vice versa. In reality, urbanization tends to reduce the presence of mosquitoes adapted to rural and sylvatic (forests) environments while creating ideal conditions for species that thrive near humans. This shift doesn’t necessarily result in more mosquitoes overall, but it does increase populations of species that are likely to bite humans, causing viruses to spread more widely and rapidly.

Here are some mosquito species and diseases city residents should be aware of:

Culex quinquefasciatus is the primary vector of the most widespread disease in the country, West Nile virus (WNv). Culex quinquefasciatus can also serve as a secondary vector for Oropouche virus (OROV). OROV has been primarily isolated in South American countries like Brazil and Peru since the 1960s, but has spread significantly in a short period. Since 2024, over 120 cases have been identified in the U.S., likely due to travel-related exposure1.

Other urban mosquitoes, including Aedes aegypti and Aedes albopictus, feed primarily on humans. They search for bloodmeals during the day when humans are most active, and are highly efficient vectors of diseases such as dengue, Zika, and chikungunya.

The 4Ds: Protect Yourself from Dangerous Mosquitoes

Whether you live in an urban or rural area, it’s important to protect yourself from biting mosquitoes by practicing the “4 D’s.”

DEFEND

●   Use an EPA-approved repellent

●   Protect pets with heartworm prevention

DRESS

●     Wear light-colored, loose-fitting clothes and closed-toe shoes.

●     Apply repellent to exposed skin on hands, ankles, neck, and face.

DRAIN

●     Eliminate mosquito breeding sites by emptying standing water in buckets, birdbaths, tarps, plant saucers, and other containers.

●     Ensure gutters, flower pots, rain barrels, and stormwater systems drain properly.

DUSK & DAWN

●     Limit outdoor activity when mosquitoes are most active - Urban mosquitoes typically feed at dawn and dusk and rest in shaded, cool areas during the day.

Planning Ahead to Protect Public Health

Personal protection goes hand in hand with an Integrated Mosquito Management (IMM) program. These programs are designed to monitor changes in mosquito populations, identify new disease threats, and initiate targeted solutions. Surveillance and disease testing, larval and adult mosquito control, and public education are core pillars of an effective IMM program. Every city and region is different, which is why IMM programs are tailored based on goals, budgets, risk levels, and many other factors.

In many areas, urban development is only accelerating, but with proper planning, communities can stay ahead of mosquito-related threats as landscapes and populations change.

1 Why Is Oropouche Spreading so Fast? | Medscape, published May 19, 2025

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Contact Our Experts

Complete the form below or call us at 800-413-4445 to speak to an expert about your mosquito management needs.

VDCI_Logo_squareSince 1992, Vector Disease Control International (VDCI) has taken pride in providing municipalities, mosquito abatement districts, industrial sites, planned communities, homeowners associations, and golf courses with the tools they need to run effective mosquito control programs. We are determined to protect the public health of the communities in which we operate. Our mosquito control professionals have over 100 years of combined experience in the field of public health, specifically vector disease control. We strive to provide the most effective and scientifically sound mosquito surveillance and control programs possible based on an Integrated Mosquito Management approach recommended by the American Mosquito Control Association (AMCA) and Centers for Disease Control and Prevention (CDC). VDCI is the only company in the country that can manage all aspects of an integrated mosquito management program, from surveillance to disease testing to aerial application in emergency situations.

Are Mosquito Control Programs Different from County to County or City to City?

Why Mosquito Control Programs Differ Across Communities

To those less familiar with mosquito control, it might seem straightforward. However, mosquito management approaches can vary widely from county to county and city to city. Whether a mosquito program is managed in-house by city or county departments such as public works or environmental services, or outsourced to contractors like VDCI, there’s no one-size-fits-all approach.

Each jurisdiction designs its program around many factors, including local mosquito species, community populations, surrounding geography, community management goals and desires, and available budget. The products and methods used for controlling mosquitoes can also vary greatly. Decisions are guided by the targeted mosquito species, their unique behaviors, and scientific analysis of resistance mechanisms within the local mosquito population. These insights help determine which control products will be most effective and whether ground-based, aerial, or a combination of methods should be used.

plane spraying adulticide

Matching Application Methods to Environments

The targeted mosquito species also influences whether ground-based methods are sufficient or if aerial applications are necessary for effective control. Some salt-marsh species like Aedes sollicitans and Aedes taeniorhynchus are strong flyers capable of traveling several miles from their breeding grounds. Others, such as the Asian tiger mosquito (Aedes albopictus), stay much closer to home—typically within 50 meters of small, artificial containers like buckets, flower saucers, pet bowls, and clogged gutters, often found in urban settings.

Furthermore, each city and county faces its own set of operational and environmental challenges that shape how mosquito control is approached. Terrain, climate, and the types of mosquitoes present can differ significantly, even within the same state. For instance, the coastal marshes of eastern Virginia can face very different challenges than the mountainous landscapes in the western part of the state. These distinctions play a critical role in shaping program design.

Challenges Facing Public Mosquito Programs

While many jurisdictions have sophisticated mosquito management programs and employ experienced entomologists and experts, others simply lack the resources. Some may be limited by budgets, insufficient manpower, or competing priorities. For example, mosquito control may take a backseat to urgent infrastructure issues like road repairs or sewer maintenance. Incorporation status can also influence coverage. Some unincorporated areas may be excluded from county-managed programs, leading to gaps in mosquito control.

Bridging the Gap with Specialized Teams

Contractors like VDCI can step in to bridge these gaps. Unlike municipal staff who often juggle multiple responsibilities, our team of experienced technicians and entomologists is solely dedicated to mosquito management. We stay current on emerging technologies, maintain required certifications, and continuously invest in specialized training. This focus allows us to respond quickly and strategically when mosquito threats arise. Meanwhile, some city or county employees may struggle to keep up with credentialing requirements or respond as swiftly amid competing demands.

mosquito tech talking to customer

Programs Designed Around Your Community’s Needs

No matter your level of need, VDCI has the technical expertise to run or support your program and collaborate with local leaders and stakeholders. Our Integrated Mosquito Management (IMM) programs are designed around each jurisdiction’s specific goals and budget. Essential strategies like surveillance, disease testing, and larval and adult mosquito control, and public education can be adapted as needed to keep your community safe. Together, we can develop a program that meets your immediate needs and remains effective over time.

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Contact Our Experts

Complete the form below or call us at 800-413-4445 to speak to an expert about your mosquito management needs.

VDCI_Logo_squareSince 1992, Vector Disease Control International (VDCI) has taken pride in providing municipalities, mosquito abatement districts, industrial sites, planned communities, homeowners associations, and golf courses with the tools they need to run effective mosquito control programs. We are determined to protect the public health of the communities in which we operate. Our mosquito control professionals have over 100 years of combined experience in the field of public health, specifically vector disease control. We strive to provide the most effective and scientifically sound mosquito surveillance and control programs possible based on an Integrated Mosquito Management approach recommended by the American Mosquito Control Association (AMCA) and Centers for Disease Control and Prevention (CDC). VDCI is the only company in the country that can manage all aspects of an integrated mosquito management program, from surveillance to disease testing to aerial application in emergency situations.

Fighting Insecticide-Resistant Mosquitoes: How You Can Help

VDCI employee using a measured pipette into a beaker

How to Help Avoid Insecticide-Resistant Mosquitoes

In the ongoing battle against mosquito-borne diseases, an ongoing challenge has emerged that threatens to undermine public health efforts and the effectiveness of existing control strategies: insecticide resistance. As these insecticide-resistant mosquito populations grow, the tools and methods we rely on for mosquito management can become less effective, potentially leading to increased mosquito-borne disease transmission or nuisance populations. Understanding insecticide resistance, its causes, and its implications is crucial for executing successful mosquito management programs.

Clsoe-up-mosquito

This is where Vector Disease Control International (VDCI) steps in. As a leader in mosquito management, VDCI is at the forefront of developing and implementing control strategies to help prevent insecticide-resistant mosquitoes. By leveraging surveillance and data to drive mosquito management efforts, conducting rigorous insecticide resistance testing on mosquito larvae and adults, and fostering community education and participation, VDCI aims to protect public health while preserving the efficacy of insecticides for future generations. 

What Causes Mosquitoes to Become Insecticide Resistant?

There are many reasons why insecticide-resistant mosquitoes can develop. It often occurs when a single class of products is relied on to manage an outbreak or a product is overused within a particular area. Over time, this can lead to mosquito populations developing genetic mutations where insecticides intended to manage them become less effective. When a mosquito develops this genetic mutation, it can pass on this trait to its offspring. Over time, this mosquito population develops resistance and is no longer affected by the insecticide class used. This phenomenon makes insecticide resistance monitoring critical in all mosquito management programs.

In the United States alone, the agricultural sector applies over a billion pounds of pesticides annually, which includes insecticides that share similar active ingredients with those used in mosquito control programs. The Insecticide Resistance Action Committee (IRAC) has noted that insecticide-resistant mosquitoes can emerge when mosquitoes are exposed to these similar compounds through agricultural applications. The use of pesticides in agriculture, combined with insecticides used in mosquito management, underscores the importance of insecticide resistance monitoring.

bottles in lab

Types of Insecticide Resistance

Even with the implementation of best practices, such as responsible product usage and continuous monitoring, it’s likely that some degree of insecticide-resistant mosquitoes will emerge due to natural variations within wild populations. Identifying the specific type of resistance that has developed is a crucial step in devising an effective management strategy to counteract it.

    • Cross Resistance: When a mosquito becomes resistant usually to a similar class of insecticides due to the presence of one or more common resistance mechanisms.

    • Multiple Resistance: When a mosquito becomes resistant to two or more insecticides due to multiple mechanisms of resistance.

    • Target-Site Resistance: When a mosquito develops a point mutation within the insecticide target region, preventing the insecticide from acting effectively. These point mutations occur in the nervous system and involve the sodium channels, acetylcholinesterase and or GABA receptors.

    • Behavioral Resistance/Avoidance: When mosquitoes alter their behavior to avoid exposure to specific products, such as not landing on surfaces that have been treated with insecticides.
resistance-testing

Impact on Integrated Mosquito Management

The most effective strategy for controlling mosquitoes and reducing the spread of mosquito-borne diseases is an Integrated Mosquito Management (IMM) program. However, insecticide-resistant mosquitoes pose a significant challenge to IMM efforts and public health. Once mosquitoes develop resistance, mosquito control measures, a cornerstone of IMM strategies, can lose their effectiveness. When applications are less effective, mosquito populations can rise, which in turn, raises the risk of disease transmission to humans. Diseases such as dengue fever, EEE, and West Nile virus, could see surges in case numbers as control measures fail to effectively suppress mosquito populations.

To effectively control adult and larval mosquito populations, ongoing monitoring and data collection should take place throughout a management program.

Testing for Insecticide-Resistant Mosquitoes

Various methods are available to evaluate how susceptible local mosquito populations are to control measures. Among these, the CDC Bottle Bioassays is the primary method for detecting insecticide-resistant mosquitoes. During this testing process, adult mosquitoes are placed in bottles coated with a diluted insecticide solution. These mosquitoes are then compared to a control group, enabling experts to gauge the pesticide’s effectiveness over time.

Other insecticide resistance tests include the WHO Tube test, which assesses adult mosquitoes, and the cup bioassay testing, which tests larvae against larvicides.

mosquito samples in bottles

VDCI’s Fight Against Insecticide Resistance

VDCI is at the forefront of combating the growing challenge of insecticide-resistant mosquitoes. We recognize the critical importance of staying ahead of resistance patterns and prioritize regular testing of mosquito populations to help detect the early signs of insecticide resistance. This testing is not a mere formality but a crucial tool in our arsenal, enabling us to detect shifts in the effectiveness of various insecticides. The insights gained from these tests guide our mosquito control strategies and allow us to review the insecticides we deploy, how we apply them, and the timing and specific locations of treatments. 

How Can The Public Help Prevent Insecticide-Resistant Mosquitoes?

In the fight against insecticide-resistant mosquitoes, there are several practical steps everyone can take to reduce insecticide resistance and protect themselves from mosquito-borne diseases. One effective approach is the elimination of mosquito breeding habitats. Mosquitoes lay their eggs in standing water, so by diligently dumping out any stagnant water around homes—such as in plant saucers, bird baths, and blocked gutters—citizens can significantly reduce breeding grounds. 

Beyond these actions, educating oneself about mosquito-borne diseases and their prevention is crucial. Understanding the life cycle of mosquitoes, breeding habits, and the diseases they can carry equips individuals with the knowledge to implement more effective protective measures. This includes adopting practices such as wearing long-sleeved, light-colored clothing, avoiding the outdoors during peak mosquito activity, and applying EPA-approved mosquito repellents. By combining practical actions with science-backed strategies, citizens can help reduce the impact of insecticide-resistant mosquitoes and protect public health.

Contact Our Experts

Complete the form below or call us at 800-413-4445 to speak to an expert about your mosquito management needs.

VDCI_Logo_squareSince 1992, Vector Disease Control International (VDCI) has taken pride in providing municipalities, mosquito abatement districts, industrial sites, planned communities, homeowners associations, and golf courses with the tools they need to run effective mosquito control programs. We are determined to protect the public health of the communities in which we operate. Our mosquito control professionals have over 100 years of combined experience in the field of public health, specifically vector disease control. We strive to provide the most effective and scientifically sound mosquito surveillance and control programs possible based on an Integrated Mosquito Management approach recommended by the American Mosquito Control Association (AMCA) and Centers for Disease Control and Prevention (CDC). VDCI is the only company in the country that can manage all aspects of an integrated mosquito management program, from surveillance to disease testing to aerial application in emergency situations.