How to get rid of spotted lanternflies

The short answer: control by life stage

The fastest way to actually reduce the spotted lanternflies around your home is to do the right thing at the right time of year. No method works on every stage, so the calendar matters more than any one product:

• Fall to early spring — find and destroy egg masses before they hatch. Each one you scrape off is dozens of insects that never appear.
• Late spring to mid-summer — kill nymphs as they climb; this is when a circle trap does its quiet work.
• Mid-summer into fall — knock down adults and, if you have a tree they swarm, protect it with a labeled insecticide.
• Any time — remove tree of heaven, their favorite host, to lower how many your yard can feed.

One habit underpins all of it: the lanternfly spreads by hitchhiking, so check your car, trailer, firewood, and outdoor gear before moving them, and never relocate an egg mass by accident.

How to kill spotted lanternfly egg masses

Destroying egg masses is the single highest-value thing you can do, because each mass holds roughly 30 to 50 eggs and killing it in winter erases an entire cohort before it hatches in spring. Egg masses are laid from fall until the first hard freeze and overwinter on almost any hard surface — tree trunks (especially tree of heaven), stone, brick, fence posts, patio furniture, and the underside of vehicles and trailers. A fresh mass looks like a smear of gray, drying mud about an inch long; an older one looks like neat rows of brownish, seed-like eggs once the coating wears away.

To destroy one, Penn State's method is simple: scrape the mass off the surface with a plastic card or putty knife into a bag or container of rubbing alcohol or hand sanitizer, where the eggs are left permanently, or crush and smash the mass thoroughly on the spot. A cheap plastic scraper and a small bottle of hand sanitizer is all the kit you need — nothing fancier works better. Be realistic about reach, though: extensions note that fewer than 2% of egg masses sit within 10 feet of the ground, so scraping is a meaningful dent in a yard's population, not a complete cure. Higher masses are a job for a trap or a professional, not a ladder.

How to control spotted lanternfly nymphs

The best way to control nymphs is to intercept them as they climb, because young spotted lanternflies instinctively walk up tree trunks to feed — a behavior you can exploit. Early nymphs (black with white spots) appear from late spring; the final red-black-and-white stage follows in mid-summer. They are strong jumpers and hard to catch by hand, which is why a trunk-mounted circle trap is the standout non-chemical option for this stage: it funnels the climbing nymphs into a dead-end container with no sticky surface to catch wildlife. On smaller plants you can also simply knock nymphs into a container of soapy water.

Where nymphs are numerous, a contact insecticide gives fast knockdown — Penn State's field trials found that products with bifenthrin and the systemic dinotefuran consistently controlled nymphs for about three to four weeks. Insecticidal soaps and horticultural oils also kill nymphs on contact and are a gentler first choice for a few plants, though they have no lasting residual and only work on the insects they directly hit.

How to control adult spotted lanternflies

Controlling adults comes down to reducing their numbers on the trees they favor and protecting the plants you care about, because by late summer the adults are strong flyers you can't fence out. State "kill on sight" campaigns ask people to simply stomp, swat, or squash adults wherever they're found, and on a swarmed tree a circle trap keeps catching the ones that climb. For a specimen tree under heavy pressure — or a vineyard — a labeled insecticide is the practical tool, either sprayed to kill adults directly or applied as a systemic the tree takes up.

Keep expectations honest: because adults fly in from surrounding untreated land, killing the ones on your property will not clear the neighborhood, and a treated tree can be recolonized within days in a bad year. The goal at this stage is protecting valued plants and cutting the number of females that survive to lay eggs — not eliminating every insect, which isn't realistic where the lanternfly is established.

Which insecticides work on spotted lanternfly?

The insecticides extensions recommend for spotted lanternfly fall into two groups — contact and systemic — and the right choice depends on whether you need fast knockdown or lasting tree protection. Effectiveness here is grounded in Penn State Extension's testing and its published active ingredient lists, not marketing claims. Whatever you choose, read the product label first and use it only on the sites and plants the label allows.

Contact insecticides kill the insects they land on and act fast, but break down within days and offer little protection against new arrivals. Penn State lists active ingredients including bifenthrin, carbaryl, zeta-cypermethrin, beta-cyfluthrin, and malathion among the effective conventional options, plus lower-impact choices — natural pyrethrins, insecticidal soap, neem oil, and horticultural oils — that are a sensible starting point for a handful of plants. A ready-to-use insecticidal soap or a concentrate of bifenthrin are common homeowner picks; both must be applied strictly per label.

Systemic insecticides are taken up by the tree and kill lanternflies that feed on it, giving weeks of protection from one application. Penn State notes that the systemic products recommended to protect trees contain one of just two active ingredients: dinotefuran, which is highly soluble and moves through the plant quickly for fast-acting control, and imidacloprid, which is slower to be taken up and is usually applied as a soil drench. A soil-applied dinotefuran or imidacloprid product can protect a favored tree, but systemics carry real trade-offs: they can move into flowers and be taken up by bees, so they should never be applied to plants in bloom, and trunk injection of a large tree is best left to a professional.

Circle traps: the best non-chemical option

If you'd rather not spray, a circle trap is the most effective chemical-free control for the trees lanternflies climb. It wraps the trunk in plastic insect screening that funnels the upward-walking nymphs and adults into a dead-end collection container they can't escape — no sticky surface, so far less risk to birds and beneficial insects than the old sticky bands. For a favored host tree, it quietly removes lanternflies day after day with nothing to spray.

Circle traps clearly outperform sticky bands on wildlife safety, but the two aren't identical in cost or catch, and sticky bands carry a real bycatch problem you need to understand before using one. We compare all three trap types — circle trap, sticky band, and sticky card — and explain the wildlife precautions in the dedicated spotted lanternfly traps guide.

What NOT to do: skip the home remedies

Do not use homemade sprays on spotted lanternflies — Penn State Extension has a dedicated warning against them, because they routinely cause more harm than the insect. The concoctions that circulate online — dish soap or detergent, vinegar, salt, boric acid, vegetable oil, garlic, and hot-pepper or essential-oil sprays — are untested, unreliable, and carry genuine risks:

• They damage your plants. Penn State notes that spraying dish-detergent mixes on plants on a sunny day can burn and kill the leaves; salt and vinegar can kill grass and garden plants outright.
• They can hurt people and pets. Exposure to boric acid can cause serious health effects in humans and animals; concentrated pepper sprays badly irritate skin and eyes; and mixing chemicals can create fumes that are dangerous to breathe.
• They're illegal. Using any substance as a pesticide in a way not listed on an EPA-registered label is against the law — and home brews have no label, no registration, and no safe-use directions.

If you want a low-impact approach, use the tested non-chemical tools instead — scraping egg masses, circle traps, and removing tree of heaven — and reach for an EPA-labeled insecticide only when you genuinely need one. That's not just safer; it actually works.

When to call a professional

Call a licensed professional when the job means treating a large tree or working at height, because that's where DIY control turns risky and less effective. Penn State advises against using ladders to reach lanternflies higher in a tree, and recommends hiring a qualified professional if you want to protect a tree with a systemic insecticide but lack the equipment or experience to do it safely — trunk injection and the correct dosing of a big tree in particular are best left to a certified arborist or pesticide applicator. A professional is also worth it for a serious vineyard or orchard infestation, where timing and coverage decide the season's crop.