You don't usually notice the first one, but you can’t miss the mass of flying insects following behind. Spotted lanternflies appear in clusters, cling to tree trunks and outdoor walls in dense numbers, and leave a sticky residue across patios, signage, and parked cars. They are an invasive, fast-growing problem for commercial businesses throughout New York City, Long Island, the Hudson Valley, and the wider tri-state region of New Jersey and Connecticut.
For property managers, hospitality operators, logistics sites, and any business with an outdoor footprint, the question isn't whether you'll see them; it's how quickly you can identify them, assess the severity, and when to seek lanternfly pest control.
Spotted lanternflies (Lycorma delicatula) are an invasive planthopper native to parts of China, India, and Vietnam. Despite the name, they are surprisingly poor fliers, relying on short bursts of flight and powerful hopping to move around. Adults are around an inch long with grey forewings dotted in black, and bright red underwings that flash when they take off, making them unmistakable once you've seen one.
So why are spotted lanternflies bad? They feed by piercing plants and trees, sucking sap, weakening their hosts, and excreting large volumes of a sugary substance called honeydew. That honeydew coats everything beneath it, from plants and hardscaping to vehicles and outdoor seating. This quickly develops a black sooty mold that's difficult to remove and damaging to the surfaces it grows on.
For tri-state businesses with outdoor areas, ornamental trees, vineyards, orchards, or landscaped grounds, that combination of feeding damage, honeydew, and sheer numbers is what turns a sighting into a problem. In New York, spotted lanternfly sightings are now confirmed across all five boroughs, Long Island, and the lower Hudson Valley, with active and growing populations across New Jersey and Connecticut.
Spotted lanternflies don't behave like most pests you'll find in commercial properties. They're seasonal, highly visible, and capable of moving from “a few on a tree” to covering a building façade in a matter of weeks. Knowing how they live and spread allows you to act before quarantine compliance, customer experience, or grounds maintenance becomes a real issue.
Lanternflies prefer wooded edges, landscaped grounds, and any property with a healthy population of Tree of Heaven, their preferred host. In commercial settings across the tri-state region, that often means parking lot perimeters, rail corridors, retention basins, and the unmaintained strips behind warehouses and distribution centers. They cluster on tree trunks in striking numbers, but you'll also find them on fence posts, light poles, building façades, and outdoor furniture. Egg masses are laid on virtually any smooth, flat surface, including the underside of vehicles and shipping pallets, which is how they spread between states.
Lanternflies feed exclusively on plant sap, using needle-like mouthparts to pierce trunks, stems, and vines. They have an unusually wide menu: over 70 plant species, including grapes, hops, apples, stone fruits, hardwoods like maple and walnut, and ornamentals common to commercial landscaping. Heavy feeding weakens trees, reduces fruit yields, and in vineyards has been linked to vine decline and crop loss. The honeydew they excrete is a secondary problem in itself: it attracts wasps, ants, and bees, and fuels the growth of sooty mold across any surface beneath the feeding site.
Lanternflies complete one generation per year, but each stage looks dramatically different. Egg masses are laid in autumn and overwinter as putty-colored smears on bark, stone, or equipment. Nymphs hatch in spring and progress through four nymph stages (instars): the first three are black with white spots, while the fourth turns red with black and white markings. Adults emerge mid-summer, mate, and lay the next generation of egg masses from September through early winter. Lanternfly egg masses are easy to miss and are often laid on movable objects, so properties that looked “clean” in November can be reinfested by April as outdoor dining resumes.
Lanternflies are gregarious, meaning they cluster in large groups rather than spreading out. When disturbed, they hop rather than fly, often onto whatever is closest, including people, which is unsettling but harmless. They don't bite or sting. They are, however, remarkable hitchhikers: adults and egg masses readily attach to vehicles, trailers, outdoor equipment, firewood, and pallets, which is why quarantine zone regulations in New York, New Jersey, and surrounding states require businesses to inspect and self-certify before moving certain goods. The “stop the spread” campaigns across the region exist precisely because human transport, not flight, is the main driver of their expansion.
Agricultural producers in the tri-state region regularly contend with significant feeding damage and yield losses due to lanternflies. However, the commercial impact also extends to property managers, hospitality venues, logistics operators, and retail sites with an outdoor footprint. The results: customer complaints, sticky residue across patios and signage, sooty mold staining on building exteriors, and escalating grounds maintenance costs.
The industries most exposed include:
Simply put, lanternflies create cross-industry regulatory, reputational, and structural risks that can rapidly escalate into financial losses without a sustainable, preventive strategy in place.
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Adults have very distinct markings, while nymphs are black-and-white or red-and-black depending on their stage. However, the clearest signs of an infestation are SLF egg masses (grey, putty-like smears on bark, stone, or equipment), sticky honeydew on surfaces below trees, and black sooty mold growing on that residue. Wasps, ants, and bees gathering around tree trunks or outdoor furniture is another indicator, as they feed on honeydew.
Start by documenting what you've found and where, including any egg masses on outdoor equipment, vehicles, or pallets. This is crucial for quarantine compliance if you move goods between states. Don't rely solely on DIY methods like tree banding and traps, which can help reduce numbers but won't address the host plants or egg masses sustaining the population.
Since lanternflies are an invasive species impacting NY and NJ at scale, a coordinated approach, including host plant management, egg mass removal, targeted treatment, and ongoing monitoring, is what actually breaks the cycle. If your property is in or near a quarantine zone, professional treatment is the most reliable way to stay compliant and limit spread to neighboring sites.