Bruno Pugh
Invasive insects are more than just a nuisance—they pose serious peril to ecosystems, crops, and homes across the United States. Unlike native species, these invaders often have no natural predators, meaning their populations can grow rampant. If not addressed, they can cause considerable harm to the environment.
Emerald Ash Borer
Emerald ash borers are metallic green beetles native to Asia. First detected in 2002, they burrow into tree bark, cutting off nutrient flow and eventually destroying the tree. If left unchecked, they can wipe out entire forests. As a way to limit spread, tree removal or pesticide application can help.
Spotted Lanternfly
These colorful pests, introduced to the US in 2014 from Asia, feed on over 70 plant species and leave behind a sticky residue that encourages mold growth. This causes significant damage to crops and trees. To slow the spread effectively, remove egg masses early on.
Asian Longhorned Beetle
Hardwood trees across the country are threatened by the Asian longhorned beetle. The larvae bore deep into the trunks, disrupting the flow of nutrients and weakening their structural integrity. These were first discovered in New York in the 1990s and remain a serious issue.
Brown Marmorated Stink Bug
Originally from East Asia, the brown marmorated stink bug has caused issues in the US since its arrival in the 1990s. These bugs feed on fruits, vegetables, and crops, which leads to widespread agricultural losses. The most common way to prevent infestation is by sealing entry points and using traps.
Red Imported Fire Ant
Red imported fire ants, introduced from South America, have very painful stings and aggressive behavior. They create large mounds and can damage crops and electrical equipment. These ants have spread across the southern US and displaced native species. You can get rid of them with baiting techniques and direct mound treatments.
Spongy Moth (Lymantria dispar)
Infamous for defoliating entire trees, these caterpillars have spread across the eastern US since the late 1800s. The moth’s larvae can consume the leaves of over 300 species of trees and cause extensive damage to forests. They can be controlled using pheromone traps and biological pesticides.
Asian Citrus Psyllid
The Asian citrus psyllid endangers the citrus industry by spreading a disease called citrus greening. You can control them by regularly inspecting citrus trees and using biocontrol agents. Native to Asia, they were first detected in Florida in 1998 and have since spread to several states.
Formosan Subterranean Termite
Known as one of the most destructive termites in the world, the Formosan subterranean termite came to the US from East Asia. These bugs cause severe damage to wooden structures, often going unnoticed until it’s too late. They’re difficult to eradicate and require professional-grade baiting systems.
Japanese Beetle
The Japanese beetle is a voracious eater of over 300 plant species, such as roses, grapes, and fruit trees. Introduced to the US in 1916, they have caused widespread damage to gardens and crops. Hand-picking, traps, and targeted pesticide treatments can limit their impact on plants and landscaping.
Pine Wilt Nematode
Longhorn beetles carry these microscopic worms that destroy millions of pine trees every year. These worms invade tree tissues, blocking water and nutrient flow and leading to wilting. The best way to get rid of them is to remove infected trees and control beetle populations.
Argentine Ant
Though tiny, Argentine ants are a highly invasive species. They build massive colonies that displace native ants and upset local ecosystems. To manage infestations, set bait stations and seal cracks, as these ants are attracted to sugary foods and sometimes invade homes for sustenance.
Asian Tiger Mosquito
Vector for many diseases, including dengue and Zika virus, the Asian tiger mosquito is an aggressive day-biting mosquito, originally from Southeast Asia. It has been quickly spreading across the southern US since the 1980s. Never leave standing water around homes and on the street; that’s where they lay their eggs.
The Caribbean Crazy Ant
This is a fast-spreading invasive species known for forming massive colonies and overwhelming homes and agricultural areas. First detected in the southern US, these ants displace native species and can damage electrical equipment by nesting in wiring. Effective management involves using baits and barriers to keep their populations under control.
Kudzu Bug
Native to Asia, the kudzu bug feeds on soybeans and kudzu, a fast-growing vine. First discovered in the US in 2009, this insect has spread across the Southeast, damaging crops and the surroundings. To protect your crops from kudzu, you will need to apply specialized insecticidal treatments.
Mexican Fruit Fly
From Central America, this Mexican fruit fly is a major peril to fruit crops that can ruin entire harvests because the larvae burrow into ripening fruit. The US Department of Agriculture monitors and treats areas where these are found using sterile insect techniques and trap deployment.