Spotted Lanternfly Has Arrived on Long Island
Spotted lanternfly (Lycorma delicatula), the invasive planthopper from Asia that has devastated crops and landscapes throughout the Mid-Atlantic and Northeast, has established populations on Long Island and is spreading. Nassau County and parts of western Suffolk County are now confirmed infestation areas, and the insect's spread further east along Long Island is a matter of when, not if.
For Long Island homeowners, spotted lanternfly represents a genuine threat to trees, ornamental plantings, and the outdoor quality of life that Long Island's landscape is known for. Understanding what to look for, what to do, and how to protect your property is essential.
What Spotted Lanternfly Does to Long Island Properties
Spotted lanternflies feed by piercing plant tissue and extracting sap. This weakens plants and produces two secondary problems that directly affect Long Island homeowners:
Honeydew accumulation: Feeding spotted lanternflies excrete enormous quantities of sticky, sugary honeydew that coats everything below infested trees — decks, patios, outdoor furniture, vehicles, and the trees themselves. This honeydew rapidly develops a coating of sooty black mold that stains wood, fabric, and hard surfaces. For Long Island homeowners with outdoor entertaining spaces, a spotted lanternfly infestation turns a backyard into an unusable, sticky mess by late summer.
Plant damage: While spotted lanternflies target Tree of Heaven (an invasive species abundant throughout Long Island) as their preferred host, they readily attack grapes, hops, apples, peaches, cherries, maples, oaks, walnuts, birches, and many ornamental landscape trees when preferred hosts are crowded. North Fork vineyards, Long Island orchards, and residential fruit trees and ornamental maples are all at risk.
Identifying Spotted Lanternfly on Long Island
Long Island homeowners should know the following life stages:
Egg masses (October–May): Spotted lanternflies lay flat, gray-brown egg masses on any hard surface — tree bark, stone walls, fences, patio furniture, vehicles, storage containers, and the sides of houses. Each mass contains 30–50 eggs covered in a waxy coating. Fresh egg masses look like putty; older ones crack and resemble dried mud. Scraping and destroying egg masses is the most impactful action individual Long Island homeowners can take.
Nymphs (May–July): Early-stage nymphs are black with white spots. Later nymphs develop red coloration. They are highly mobile and can be difficult to catch.
Adults (July–December): Adults display gray-brown forewings with black spots, bright red hindwings visible during flight, and a yellow abdomen. They are striking and distinctive. Adults swarm on preferred host trees — particularly Tree of Heaven — in large numbers at peak season, often covering entire trunks and major branches.
Tree of Heaven: Long Island's Spotted Lanternfly Magnet
Tree of Heaven (Ailanthus altissima) is itself an invasive species that is widespread throughout Long Island — along roadsides, railroad rights-of-way, vacant lots, and wooded margins throughout Nassau and western Suffolk. Where Tree of Heaven grows, spotted lanternfly populations concentrate and build to high numbers. Removing Tree of Heaven from your Long Island property — or treating it as a trap crop and then eliminating it — is one of the most effective long-term management strategies.
How Spotted Lanternfly Spreads on Long Island
Human movement is the dominant driver of spotted lanternfly spread. Long Island's extensive commuter and recreational travel patterns — LIRR trips to the city, summer traffic to the Hamptons and North Fork, movement of landscaping equipment and firewood — all create pathways for eggs and insects to reach new areas. Long Island residents can slow spread by:
- Inspecting vehicles (especially undercarriages, wheel wells, and roof racks) before leaving areas with active populations
- Never moving firewood from Long Island — especially to the East End or North Fork, where populations are still establishing
- Checking outdoor furniture, sports equipment, and stored materials for egg masses before moving them
- Reporting sightings to the NYS DEC through the iMapInvasives app
Professional Spotted Lanternfly Treatment on Long Island
For Long Island properties with established spotted lanternfly populations, professional treatment options include targeted foliar applications to preferred host trees, systemic trunk injections that protect individual high-value maples, oaks, and ornamental trees, and barrier treatments for outdoor living areas. Early-season treatment before populations peak in August and September produces the best results.
Call Rest Easy Pest Control at 888-927-9842 to schedule a spotted lanternfly assessment for your Long Island property.