How to identify a spotted lanternfly
Adults (1 inch long) have distinctive forewings: grayish-tan with black spots. Hindwings are brilliant red with black spots and a white band — visible in flight. Nymphs are black with white spots (early instars) becoming red with white spots before adulthood. Egg masses look like dried mud smears on flat surfaces — smooth-barked trees, rocks, fence posts, outdoor furniture, and vehicles.
Why they're devastating
SLF feed by piercing plant stems and sucking phloem sap. They excrete excess sugar as "honeydew" that coats surfaces and grows black sooty mold. Heavy infestations weaken plants, reduce fruit yields by up to 90% in vineyards, and make outdoor spaces unpleasant and unusable. They have no significant natural predators in North America.
Multiple states have active quarantine zones requiring permits before moving outdoor items, vehicles, plants, and wood out of designated counties. If you're in Pennsylvania, New Jersey, Delaware, Maryland, Virginia, New York, or Connecticut — check your state's Department of Agriculture for current quarantine boundaries. Moving egg masses unknowingly is the primary spread mechanism.
Action steps if you find spotted lanternflies
- 1Kill it immediatelyStomp it. Catch it in a zip-lock bag and seal. Squish it. There is no reason to handle it carefully — every adult killed is one less laying eggs.
- 2Report your sightingReport to your state's Department of Agriculture (PA: 1-888-4BADFLY; NJ, NY, MD, VA: each has an online reporting portal). Include a photo, location, and date. Reports drive survey and control resources.
- 3Scrape egg massesFrom September through June, look for egg masses on smooth surfaces. Scrape into a bag with rubbing alcohol and dispose. Each mass contains 30–50 eggs.
- 4Remove Tree of Heaven (Ailanthus)The SLF's preferred host plant. Removing Ailanthus from your property reduces SLF population pressure significantly. Treat cut stumps immediately with glyphosate or triclopyr to prevent resprouting.
- 5Check your vehicleBefore leaving an infested area, check under your car, in wheel wells, and on any outdoor items for egg masses. This is how SLF spread to new states.
Chemical control options
Dinotefuran (Safari): Applied as a soil drench or bark spray to host trees. Taken up systemically — SLF feeding on treated trees are killed. Most effective chemical option for protecting high-value trees and vines. Professional application recommended for large trees.
Neem oil: Contact kill effective on nymphs — not as effective on adults. Safe for pollinators when applied correctly. Repeat applications needed. Best for organic situations and direct-spray on small infestations.
Sticky band traps on trees: Circle traps around tree trunks capture nymphs as they climb. Important: use circle traps, not plain sticky tape — plain tape catches birds and other non-target wildlife.
Spinosad: Effective on nymphs. OMRI-certified organic option. Apply as foliar spray.
The spotted lanternfly's expansion has been slowed meaningfully in areas with high public awareness and reporting. Every egg mass scraped, every adult killed, and every sighting reported contributes to the collective containment effort. Early detection in new areas — reported quickly — allows rapid response before populations establish.
● Established · ◐ Spreading · ○ Detected — check state ag dept for current data