Invasive Insects in the US: What to Watch Out For in 2025
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Learn about the most dangerous invasive insects in the United States in 2025. Find out how to identify, report, and manage these pests.
Article:
Invasive insects are a growing concern across the United States. These non-native species can destroy crops, forests, and native wildlife, causing billions of dollars in damages each year. In 2025, several key invaders are expected to expand their range. Here’s what to watch for — and how to take action.
1. Spotted Lanternfly (Lycorma delicatula)
Originally from Asia, this colorful insect has already invaded several eastern states and is spreading west. It feeds on over 70 plant species, especially grapevines, fruit trees, and hardwoods.
Key signs:
- Grey wings with black spots
- Red hindwings visible in flight
- Sticky honeydew and black sooty mold on plants
What to do:
Scrape off egg masses, report sightings to local authorities, and avoid moving firewood or outdoor gear from infested areas.
2. Emerald Ash Borer (Agrilus planipennis)
This metallic green beetle has already killed tens of millions of ash trees across the US. It lays eggs under the bark, and larvae tunnel into the wood, killing the tree from the inside out.
Key signs:
- D-shaped exit holes in bark
- Canopy dieback
- Bark splitting or woodpecker damage
What to do:
Use certified treatments only, and report infected trees. Avoid transporting ash wood.
3. Asian Longhorned Beetle (Anoplophora glabripennis)
A destructive pest of hardwood trees, this beetle is black with white spots and long striped antennae. It threatens maple, elm, willow, and poplar trees.
Key signs:
- Round exit holes (about the size of a pencil)
- Oozing sap or sawdust piles
- Branch dieback
What to do:
If spotted, contact the USDA or your state’s agriculture department immediately.
4. Red Imported Fire Ant (Solenopsis invicta)
Native to South America, this aggressive ant forms large mounds and delivers painful stings. It threatens native insects, livestock, and even humans in some areas.
Key signs:
- Dome-shaped soil mounds without a visible entrance
- Swarms of reddish ants when disturbed
What to do:
Avoid disturbing mounds, use approved baits, and report new infestations in non-established areas.
5. Brown Marmorated Stink Bug (Halyomorpha halys)
This shield-shaped bug feeds on fruits and vegetables and invades homes in fall. It’s difficult to control and causes major agricultural losses.
Key signs:
- Brown, mottled shield shape
- Pungent odor when crushed
- Surface damage on apples, peaches, and tomatoes
What to do:
Seal cracks in buildings, use traps in gardens, and avoid squashing them indoors.
6. Asian Citrus Psyllid (Diaphorina citri)
A major threat to citrus crops, this insect spreads Huanglongbing (citrus greening), a deadly disease that ruins fruit and trees.
Key signs:
- Tiny brown/gray insects on new citrus growth
- Yellow shoots, misshapen fruit, and leaf blotching
What to do:
Report symptoms immediately if in citrus-producing states like Florida, California, or Texas.
Protecting Your Garden and Community
Invasive insects often spread through human activity — moving firewood, plants, or outdoor furniture can unknowingly transport eggs or larvae.
Be proactive:
- Buy local plants and trees
- Clean tools and gear before moving between areas
- Report suspicious insects to your state’s agricultural extension office
Conclusion:
2025 is shaping up to be a critical year for invasive insect monitoring in the US. By staying informed and acting quickly, homeowners, gardeners, and land managers can help slow the spread of these destructive species.
— Armiere
458socom.org 
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