Invasive Species Detection: Spotted Lanternfly and Brown Tree Snake

Last updated: May 23, 2026

The Invasive Species Detection Mission

Invasive species cause documented economic and ecological harm in the United States, with annual cost estimates running into tens of billions of dollars across agriculture, fisheries, forestry, and infrastructure. Early detection and rapid response is the most cost-effective intervention available — every infestation caught at low density is dramatically cheaper to manage than the same species established and spreading. Detection dogs have emerged as a powerful tool for finding invasive plants, insects, mollusks, and reptiles at densities where human visual inspection misses them.

The discipline overlaps with conservation detection, agricultural inspection, and federal biosecurity work. Programs run through state agriculture departments, federal agencies, university working-dog centers, and conservation detection nonprofits. The common thread is a trained dog finding target organisms at low density across landscapes too large for thorough visual survey.

Spotted Lanternfly Detection

The spotted lanternfly is a planthopper native to Asia that arrived in Pennsylvania around 2014 and has since spread across the Mid-Atlantic and into the Northeast and Midwest. The pest feeds on a wide range of plants including grapevines, hops, and dozens of tree species, causing significant damage to vineyards, orchards, and ornamental landscapes. Eggs are laid in masses on tree bark, vehicles, outdoor equipment, and almost any rough outdoor surface, and the egg masses are how the pest spreads — they can be moved across state lines on cargo and travel before the larvae hatch.

Detection dogs trained on spotted lanternfly egg mass odor have been deployed by the Pennsylvania Department of Agriculture, the New Jersey Department of Agriculture, the Virginia Department of Agriculture and Consumer Services, and the Penn Vet Working Dog Center starting around 2018. The dogs work nurseries, vineyards, cargo staging areas, and transportation hubs to find egg masses on plant material, vehicles, and equipment that might be shipped to uninfested regions.

The training was developed in partnership between Penn Vet Working Dog Center and state agencies, using cooperatively-sourced egg-mass samples. Dogs have demonstrated they can find egg masses on rough bark, on the undersides of pallets, and in concealed crevices that visual surveys miss. Each find prevents a potential founder population in a new region.

Brown Tree Snake on Guam

The brown tree snake interdiction program on Guam is one of the longest-running operational detection dog deployments in the United States, dating to 1993. The snake was accidentally introduced to Guam after World War II and proceeded to drive most of the island’s native bird species to local extinction. The federal priority since then has been preventing the snake from establishing on Hawaii or other Pacific islands where it would cause comparable damage.

USDA APHIS Wildlife Services maintains a fleet of detection dog teams that inspect every cargo shipment, every plane, and every ship leaving Guam. The dogs work cargo holds, wheel wells, pallets, and staging yards, alerting on live brown tree snake odor when present. Every alert triggers a manual inspection by snake-handling personnel. Most alerts are clean — no snake found — but the program has documented intercepts that prevented snakes from reaching Hawaii. The work is detailed in our piece on USDA APHIS Wildlife Services detection dog.

The program is widely considered a model for invasive species containment because of its sustained operational tempo, dedicated staffing, and documented success in protecting Hawaii from establishment. It also illustrates the economic logic of detection dog deployment — the cost of running the interdiction program is small compared to the projected cost of brown tree snake establishment in Hawaii, where the bird tourism and biodiversity stakes are enormous.

Zebra and Quagga Mussel at Boat Ramps

Zebra mussels and quagga mussels are invasive freshwater bivalves that have caused significant economic and ecological damage across the Great Lakes and Mississippi River systems. Their spread to uninfested western US waters — Colorado River, Snake River, Columbia River basin, and many western lakes — would be devastating for hydropower, drinking water infrastructure, fisheries, and recreation.

Several western states deploy detection dogs at boat-launch ramps to inspect trailered boats for mussels and mussel veligers (larval mussels) attached to hulls, in livewells, in motor coolant systems, and on trailer surfaces. Programs operate in Colorado, Idaho, Montana, California, and other states. The dogs typically work the boat ramp inspection station, sniffing each boat as it arrives or departs, while staff conduct the visual inspection in parallel.

The detection dog is particularly useful for finding adult mussels and large veligers in concealed locations on the boat — under engine cowlings, in cooling-water passages, in bilge areas. Mussels in these locations can survive cross-country transport in a wet environment and seed a new lake. A single missed boat can launch a new infestation that costs tens of millions to manage.

Northern Snakehead and Other Aquatic Invasives

Northern snakehead detection has been piloted in the Mid-Atlantic where the species has established in the Potomac River drainage. Detection dogs can locate snakehead in catch buckets and bait wells, supporting enforcement of bans on possession and live transport. Several other aquatic invasive species have been the subject of pilot detection work, including invasive crayfish, certain invasive fish, and aquatic invasive plants like hydrilla and water chestnut.

The general pattern is that invasive aquatic species are economically high-stakes, hard to detect visually at low density, and well-suited to detection K9 work where samples can be sourced for training. State agencies and federal partners increasingly tap detection dog capability for emerging aquatic threats.

Asian Longhorned Tick and Emerging Insect Threats

The Asian longhorned tick, established in the eastern US since around 2017, poses livestock and human disease transmission risks. Detection dog work on this species and other emerging arthropod threats is in earlier stages but reflects the general trend of using detection K9s for invasive insects where the species has a distinctive odor signature and is hard to find at low density.

The emerald ash borer, Asian longhorned beetle, and various invasive moths and beetles have been the subject of detection work or pilot studies. Some programs target specific life stages — larvae in wood, egg masses on tree bark, adult insects at trap sites — depending on the target organism’s biology and what is most useful for management.

Invasive Plant Detection

Detection dogs have been used to find invasive plants at low density where eradication is feasible. Dyer’s woad in Idaho rangelands, spotted knapweed in the Rocky Mountains, leafy spurge in northern Great Plains, and various other noxious weeds have been targets. Dogs find rosettes and early-stage plants smaller than crews can spot from typical walking surveys, supporting the “find the last few plants” phase of eradication that determines whether the effort succeeds.

This work is often run by conservation detection nonprofits including Working Dogs for Conservation, covered in our piece on Working Dogs for Conservation scat detection, and university programs in partnership with land management agencies. The methodology shares the same training rigor and validation framework as scat detection — the dog is imprinted on the plant’s chemical signature and proofed against distractors.

Where Invasive Species Detection Fits

The invasive species detection space sits at the intersection of federal agriculture, conservation, and biosecurity work. The USDA Beagle Brigade screens travelers and cargo entering the country, while invasive species detection often targets the same threats in-country after they have entered. The customs wildlife trafficking K9 program targets a different category of biological contraband at the same ports of entry. The broader CBP and TSA detection pillar sits over all of this federal work.

Bedbug detection, covered in our bedbug detection dog NESDCA certification piece, is a related discipline at the residential pest-control scale rather than at the agricultural-biosecurity scale, but uses comparable training methodology.

Training and Sources of Dogs

Invasive species detection dogs come from many sources. Some are sourced from shelters and rescues by conservation detection nonprofits, following the same high-drive temperament pipeline that supports the broader working dog washout adoption pipeline. Some come from working-dog breeders and contractors. State agriculture programs sometimes use Lab and Lab-mix dogs from in-state vendors trained at facilities like Penn Vet Working Dog Center.

Training imprints the dog on target odor — egg mass, snake, mussel, plant material, or insect — and proofs against distractor odors and increasingly complex search environments. Working teams certify against program-specific standards rather than a single national certification body. Some federal programs internal to USDA APHIS use APHIS validation protocols. Others rely on the partner organization’s training and validation standards.

Economic and Ecological Stakes

Invasive species detection makes economic sense because the cost of running detection programs is small compared to the cost of established invasive species. Estimates for spotted lanternfly economic damage in Pennsylvania alone run into hundreds of millions per year if uncontrolled. Brown tree snake establishment in Hawaii is projected to cost billions over time in bird tourism alone. Zebra mussel infestation of a single major western reservoir would impose tens of millions in mitigation costs.

The dogs are a leveraged investment — one trained K9 team working at the right chokepoint can prevent infestations that would cost orders of magnitude more to manage. The economic logic, plus the documented operational success, has driven steady growth in invasive species detection programs over the past decade.

Frequently Asked Questions

How do I report a possible spotted lanternfly sighting?

Each state with active spotted lanternfly response has a reporting system through its state department of agriculture. Pennsylvania, New Jersey, Virginia, and other affected states accept reports through web forms and hotlines. The USDA also accepts reports through its invasive pest reporting channels.

Are invasive species detection dogs working at airports?

Some are, particularly USDA Beagle Brigade dogs trained on invasive insect egg masses (including spotted lanternfly egg masses on cargo). State agriculture department dogs more often work nurseries, vineyards, and cargo staging areas in-country rather than at airports.

How long has the brown tree snake program been running on Guam?

Since 1993. It is one of the longest-running operational detection dog deployments in any federal program and is credited with preventing brown tree snake establishment on Hawaii over the decades of operation.

Can detection dogs find invasive plants?

Yes. Documented programs have used detection dogs to find dyer’s woad, spotted knapweed, leafy spurge, and other noxious weeds at low density during eradication efforts. The methodology shares the same training rigor as scat or insect detection.

What breeds work best for invasive species detection?

The breed mix tracks the broader detection-dog profile — Labrador Retrievers, working-line Belgian Malinois, German Shepherds, Border Collies, and high-drive mixes. The temperament profile (extreme drive, persistence, work ethic) matters more than the specific breed.