“Lanternfly” usually refers to the spotted lanternfly (Lycorma delicatula), an invasive planthopper—not a true fly. It does not bite or sting people or pets, but it can stress plants, cover outdoor spaces with sticky honeydew, and spread when egg masses hitchhike on vehicles and outdoor belongings.
“Lanternfly” usually refers to the spotted lanternfly (Lycorma delicatula), an invasive planthopper—not a true fly. It does not bite or sting people or pets, but it can stress plants, cover outdoor spaces with sticky honeydew, and spread when egg masses hitchhike on vehicles and outdoor belongings.
1. Spotted lanternflies are invasive insects from Asia
The spotted lanternfly is native to Asia and was first detected in the United States in Berks County, Pennsylvania, in 2014. USDA describes it as a hitchhiking pest that likely arrived on imported goods.
Its spread is not limited to the insect flying from one plant to another. People can accidentally move lanternflies or their egg masses on vehicles, firewood, furniture, grills, trailers, bicycles, toys, landscaping equipment, and other items stored outdoors. That human-assisted movement is one reason infestations can appear far from an established population.
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The insect’s arrival is sometimes attributed to a particular type of shipment, but the authoritative guidance summarized here supports only the broader conclusion that it arrived on imported goods—not a narrower claim about one specific shipment.
2. Its wings look completely different when open and closed
An adult spotted lanternfly is about 1 inch long and about one-half inch wide. With its wings folded, it looks fairly subdued: the visible forewings are tan or brown, marked with black spots and a speckled band near the rear.
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When it opens its wings, the hindwings display much brighter colors, including red, black, white, and gray. This dramatic change is useful for identification, but the bright pattern does not mean the insect is venomous or dangerous to handle in the way a stinging insect can be.
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3. Egg masses can look like cracked mud
Fresh spotted lanternfly egg masses have a gray, putty-like covering. As they age, the covering may become a dull brown smear with a cracked-mud appearance. A typical egg mass contains approximately 30 to 50 eggs.
Females may attach egg masses to tree bark, stone, brick, fences, vehicles, grills, patio furniture, firewood, trailers, and many other hard surfaces. In other words, the insect does not have to remain on a living plant to travel. An egg mass stuck to an outdoor object can be carried to a new location without anyone noticing.
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4. Tree-of-heaven is a favorite host, but it is not the only one
Spotted lanternflies feed on plant sap from many species. Their preferred host is Ailanthus altissima, commonly called tree-of-heaven, but they can also feed on grapevines, hops, stone-fruit trees, and hardwood trees.
New York agriculture officials report that nymphs and adults feed on more than 70 plant species. This broad host range helps explain why the insect matters to vineyards, orchards, forests, gardens, and residential landscapes.
That does not mean every host plant will be killed. Spotted lanternflies can act as a significant plant stressor, particularly when populations are large, but plant decline may also involve other insects, diseases, weather, or environmental stresses. A dying tree should not automatically be blamed on lanternflies.
5. The sticky residue is honeydew—not venom
As spotted lanternflies suck sap from plants, they excrete a sugary liquid called honeydew. It can coat leaves, patios, vehicles, decks, and other surfaces with a shiny, sticky film.
Honeydew can attract ants, wasps, bees, and other insects. It can also encourage the growth of sooty mold, a dark coating that develops on surfaces covered by the sugary secretion. As the honeydew ferments, it may produce a vinegar-like odor.
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This explains why a heavily infested area can become unpleasant even though lanternflies are not biting or stinging. The nuisance comes from the insects’ secretions, the mold that follows, and large congregations around favored host plants.
6. They are plant and nuisance pests, not biting or stinging insects
Spotted lanternflies are sap-feeding insects. The official management guidance summarized for this article does not identify biting or stinging as a characteristic risk. Their main concerns are plant stress, possible crop and forest impacts, nuisance conditions, and accidental spread.
For families with pets, that distinction matters: seeing lanternflies around a yard does not mean the yard contains a biting or stinging pest. They are not considered a direct human-health threat in the ordinary sense. However, large populations can create sticky, mold-prone conditions around homes and outdoor areas, and any pesticide used for control must be kept away from people and animals according to its label.
Do not use the absence of a bite risk as a reason to ignore a serious infestation. A population concentrated on grapevines, fruit trees, valuable landscape plants, or tree-of-heaven can still cause meaningful plant stress.
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7. Their range is expanding, and quarantine rules can affect travel
USDA APHIS listed spotted lanternfly populations in 19 states and the District of Columbia on the page reviewed August 12, 2026: Connecticut, Delaware, Georgia, Illinois, Indiana, Kentucky, Maryland, Massachusetts, Michigan, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Virginia, and West Virginia.
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That distribution is time-sensitive. USDA cautions that quarantine areas may expand when new infestations are detected, and state requirements are not identical. New York, for example, describes restrictions affecting the movement of goods and vehicles from specified counties in Delaware, Maryland, New Jersey, Pennsylvania, and Virginia.
If you live in or travel through an infested or quarantined area, check your state plant-health agency for current reporting rules and movement requirements. There is no reliable nationwide rule of thumb that replaces state guidance.
8. Inspection and proportionate control are better than panic
The most useful first response is practical inspection. Before moving a vehicle, trailer, firewood, grill, furniture, equipment, or another outdoor item, look for adult insects, nymphs, and egg masses. Remove or destroy egg masses according to current USDA, state agriculture, or Cooperative Extension instructions, and report sightings where local authorities require reporting.
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Management should be proportionate to the situation. Penn State Extension recommends an integrated-pest-management approach, which considers the insect’s life stage, the affected plant, the size of the infestation, and risks to wildlife and beneficial insects.
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- Start with physical controls where appropriate. Inspection, removal of egg masses, and preventing infested items from being transported can reduce spread.
- Consider a circle trap for nymphs. Penn State Extension identifies a circle-style trap as a recommended nonchemical option, especially for nymphs moving upward on tree trunks.
- Do not assume one property-wide treatment will solve the problem. Trapping or treating one tree does not guarantee area-wide control, particularly when nearby hosts remain infested.
- Use pesticides only when justified and exactly as labeled. Product labels determine legal application sites, rates, protective measures, and precautions around people, pets, wildlife, plants, and waterways.
- Be cautious with sticky bands. Unprotected sticky material can trap birds, squirrels, bats, lizards, pollinators, butterflies, and other non-target animals.
What should you do if you find one?
- Identify it carefully. Compare the insect with official spotted lanternfly images, including nymphs and egg masses. Several insects can look superficially similar.
- Note the location. Record the plant or object involved and, if possible, take a clear photograph.
- Check nearby outdoor items. Look over vehicles, trailers, firewood, furniture, grills, and equipment before moving them.
- Follow local reporting instructions. Reporting requirements vary by state and may change as the range expands.
- Choose control based on the situation. For a small number of nymphs, physical controls may be appropriate. For valuable plants, extensive infestations, or uncertainty about pesticide use, contact Cooperative Extension or a qualified, licensed pest-management or tree-care professional.
The takeaway
Spotted lanternflies are memorable because their folded wings hide a vivid red-and-black pattern, but their real importance is ecological and agricultural. They feed on plant sap, produce sticky honeydew, lay transportable egg masses on hard surfaces, and continue to expand their U.S. range.
They are not a biting or stinging threat to pets and people. The responsible response is still to inspect outdoor belongings, prevent hitchhiking spread, report the insect where required, remove egg masses using current official instructions, and choose control methods that protect wildlife as well as plants.
Frequently Asked Questions
Are spotted lanternflies dangerous to people or pets?
No. Spotted lanternflies are sap-feeding planthoppers, not biting or stinging insects. They are not considered a direct human-health threat in the ordinary sense. Their main effects are plant stress, sticky honeydew, sooty mold, nuisance conditions, and accidental spread.
What do spotted lanternfly eggs look like?
Fresh egg masses are gray and putty-like. Older masses can look like a dull brown smear or cracked mud and usually contain about 30 to 50 eggs. Look for them on bark, stone, brick, fences, vehicles, grills, furniture, firewood, trailers, and other hard outdoor surfaces.
How can I help stop spotted lanternflies from spreading?
Inspect vehicles and outdoor items for adults, nymphs, and egg masses before moving them. Follow your state’s current reporting and movement rules, and destroy egg masses only according to USDA, state agriculture, or Cooperative Extension instructions.
What is the safest way to trap spotted lanternflies?
A circle trap can be a nonchemical option mainly for nymphs climbing a particular tree. It does not guarantee area-wide control. Avoid unprotected sticky bands because they can trap birds, squirrels, bats, lizards, pollinators, butterflies, and other non-target wildlife.
The Bottom Line
Bottom line: Spotted lanternflies are invasive planthoppers, not dangerous flies. Watch for their cracked-mud-like egg masses, inspect outdoor items before moving them, and use wildlife-conscious, proportionate control methods—especially around valuable plants and in quarantine areas.
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