Keep Your Eyes Peeled for These Prevalent Invasive Insects in 2026
The National Pest Management Association (NPMA) collaborated with the University of Florida on the Bugs Without Borders survey, which entailed surveying 375 pest management professionals across the U.S. to identify the top trends they noticed last year. One of the main findings centers around invasive pests as a growing threat to homes nationwide. Over 40 percent of pest management professionals reported a rise in problems as a result of invasive bugs over the past year. Because these pests don’t have natural pathogens or predators in this country, they multiply faster and cause more damage than native species. And unfortunately, these aren’t just outdoor problems; these pests are finding their way inside homes as well.
Invasive species are spreading, wreaking havoc on the ecosystem and your home, says Dr. Jim Fredericks, board-certified entomologist and senior vice president of public affairs at the National Pest Management Association. “Invasive species are tough, adaptable, and in some cases can threaten your garden, your home’s structure, and even your health,” he warns. A big reason for this is global trade and travel, as these insects hitch rides inside shipping containers, on plants, and on outdoor equipment. “Additionally, the weather has an impact too,” says Fredericks. “According to our Spring & Summer 2026 Bug Barometer, which forecasts pest activity by region using weather, climate, and pest data, we’re seeing more invasive species show up earlier and in greater numbers as we get consecutive unusually warm days earlier in the season.”
Here are the top five invasive insect pests identified in the report and how to prevent and remove them if they end up in your neighborhood.
1. Red Imported Fire Ant
Region: Mid-Atlantic, including Maryland, Virginia, and North Carolina, plus most of the South and Southwest.
Origin: Native to South America, they are introduced into new areas through potted plants, shrubs, and trees.
Problems: Interfering with a fire ant nest can cause them to sting, resulting in painful welts. “Red imported fire ants are a serious health risk,” warns Fredericks. “Their stings are painful, they attack in swarms, and they can trigger severe allergic reactions.”
Prevention: Fredericks recommends keeping your yard tidy by cleaning up any fallen fruit and removing any standing water, even in a bird bath. “These pests are also drawn to electrical equipment like HVAC units, so pay close attention to these areas and contact a pro at the first signs of fire ant activity,” he explains.
2. Brown Marmorated Stink Bug
Region: Eastern half of the U.S. as well as California, Oregon, Washington, Arizona, New Mexico, and Texas.
Origin: First introduced to the U.S. in the mid-1990s from Eastern Asia.
Problems: Brown marmorated stink bugs move indoors in large numbers during colder months, warns Fredericks. “Once they’ve arrived, they release a strong odor and can damage fruit and garden plants.”
Prevention: “Fix or replace any torn window and door screens,” suggests Fredericks. “Repair any loose flashing and cracks around doors and windows; these are areas where stink bugs can enter buildings.” Other places where they can sneak in include siding, utility pipes, chimneys, electrical outlets, light switches, ceiling fans, and skylights. To get rid of stink bugs in your home, use a vacuum cleaner, but discard the bag to prevent a lingering odor.
3. Argentine Ant
Region: Southeastern states, California, and Hawaii. Less widespread infestations are also found in Arizona, Missouri, Illinois, Indiana, Maryland, and the Pacific Northwest.
Origin: Originally native to Argentina, Uruguay, Paraguay, Bolivia, and southern Brazil, they can now be found in many places around the world, including South Africa, New Zealand, Japan, Australia, the United States, and Europe. Argentine ants are believed to have been originally introduced to the continental U.S. in New Orleans via coffee ships from Brazil in the late 1800s.
Problems: Argentine ants can contaminate food and spread bacteria after moving through trash, sewage, and decaying material, says Fredericks. “In large numbers, they’ve even damaged poultry and destroyed beehives, reducing bee populations and impacting the health of our ecosystem.”
Prevention: Fredericks recommends getting rid of any standing water around your property, storing food in tightly sealed containers, and trimming back trees and plants away from your home, since ants often use branches as a bridge to get inside. Also, keep firewood at least 20 feet away from your home to prevent the ants from using it as a nesting location.
4. Multicolored Asian Lady Beetle
Region: Across the U.S.
Origin: Native to eastern Asia, including China, Japan, Mongolia, and southern Siberia, these bugs were introduced to the U.S. by the USDA in the late 20th century for agricultural pest control, but also established themselves through accidental imports.
Problems: Multicolored Asian lady beetles often catch homeowners off guard, says Fredericks. “They look like familiar ladybugs, but invade homes by the thousands and release a foul-smelling yellow fluid that stains surfaces and can trigger allergies or asthma.”
Prevention: “Repair or replace damaged screens because even the smallest tear can give them an easy way inside,” suggests Fredericks. Also, seal up crevices around doors and windows, and make sure attic vents are properly screened. If you find Asian lady beetles in your home, remove them with a vacuum.
5. Asian Cockroach
Region: Southeastern U.S.
Origin: Originally from Southeast Asia, this cockroach has spread globally and mostly thrives in warm, humid climates.
Problems: Unlike typical roaches, Asian cockroaches fly and are attracted to light. “When inside, they contaminate food, and their droppings and shed skin can also set off asthma and allergy symptoms,” notes Fredericks. While they don’t bite or sting, they are annoying when they appear on lit-up surfaces like TV screens, computers, and lampshades. They can also spread bacteria, possibly causing illnesses like salmonella or E. coli.
Prevention: Fredericks recommends cutting back on outdoor lighting near doors and other entry points because these insects are extremely attracted to light. “Keep plants and mulch away from your home’s foundation, and realize that they breed in leaf litter and debris.” It’s also a smart idea to seal entry points like gaps around doors, windows, and utility lines and properly store food in sealed containers.
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