Spotted lanternfly (Lycorma delicatula) is an invasive planthopper that threatens agriculture, forests, and residential landscapes in Pennsylvania. Effective monitoring and accurate reporting by residents, landowners, and professionals are essential to detect new infestations early, slow spread, and inform control efforts. This article outlines clear, actionable steps for identifying, monitoring, documenting, and reporting spotted lanternfly sightings in Pennsylvania, with practical tips for each stage of the process.
Early identification begins with knowing the insect’s appearance throughout the year and the kinds of damage it causes.
The spotted lanternfly has distinct life stages: egg masses, nymphs (early black with white spots, later red with black and white markings), and adults (gray-brown forewings with black spots and striking red underwings). Each stage requires a slightly different monitoring approach.
The insect feeds on a wide range of plants but shows strong preference for tree-of-heaven (Ailanthus altissima), grapevines, maples, black walnut, fruit trees, and ornamentals. Spotted lanternflies congregate on sunny, exposed trunks and stems and are commonly found in urban, suburban, and rural landscapes.
Timing your monitoring increases the likelihood of detection and effectiveness of control.
Adult monitoring is most productive from late July through November when adults are present and visible. Nymph monitoring is most effective in spring and early summer as nymphs hatch and develop. Egg mass searches are most successful in late fall through early spring, when leaves are absent and surfaces are visible.
A combination of visual surveys, trapping, and photographic documentation increases detection reliability.
Visual surveys are the simplest and most effective first step. Walk systematic transects along property boundaries, tree lines, vineyard rows, and high-risk areas such as places with tree-of-heaven or grapevines. Inspect trunks, lower branches, vines, and any outdoor surfaces.
Sticky band traps can capture nymphs and help monitor presence. Place bands around tree trunks at heights that avoid non-targets, and check and change bands frequently to reduce harm to non-target animals.
Visual inspection tips:
When using sticky bands or other trapping methods, minimize impacts on birds and beneficial insects by placing bands at heights and times that reduce non-target contact, using wrap designs that provide escape paths, and checking traps daily.
Use appropriate personal protective equipment when applying insecticides or handling sticky surfaces. Follow label instructions for any pesticides and consult licensed professionals for large or complex infestations.
Accurate documentation makes reports useful to state agencies and researchers. Collect clear photographs, precise location details, and behavioral or ecological context.
Before making a report, gather the following information if possible:
Good photos are critical. Take multiple images:
Ensure photos are in focus and taken in good light. If photographing egg masses, document the surrounding surface to help distinguish from similar-looking natural materials.
Timely reporting helps state and federal agencies track spread and prioritize response. Pennsylvania has established reporting systems and encourages residents to submit verified sightings.
When preparing to report, use the documentation checklist described above. Be concise and accurate in your descriptions. Agencies look for confirmed reports from multiple observers and high-quality photographs.
Direct action can reduce local populations but must be done carefully and legally.
Egg mass removal: Scrape egg masses into a container, double-bag, and dispose in the trash or freeze for several days before disposal. Alternatively, apply a 70% isopropyl alcohol or hand sanitizer to the egg mass and scrape after it softens, ensuring environmental and personal safety.
Nymphs and adults: Hand-picking and crushing adults or nymphs can reduce numbers in small infestations. Use gloves or a tissue and place specimens in alcohol to confirm identification if needed. In heavy infestations, consult licensed pest control professionals about targeted control measures.
Chemical controls: Registered insecticides can be effective but require careful selection and application by trained personnel to minimize harm to non-target organisms. Always follow label instructions and consider integrated pest management approaches.
Long-term suppression requires coordination among neighbors, municipalities, and land managers.
State or local agencies may follow up on confirmed reports. Follow-up actions can include verification visits, mapping, and recommendations for control. In some cases, regulatory measures such as quarantines may be imposed to limit movement of regulated articles (plant materials, firewood, mulch, vehicles) from infested areas.
Be prepared to provide additional information if requested and to work with authorities on appropriate management steps. Do not move firewood, nursery stock, or other potentially infested materials out of known infestation zones without verifying compliance with any local restrictions.
When reporting sightings, understand that location information is used to manage the pest and may be stored in public or agency databases. Do not include sensitive personal information beyond what is necessary to make the report. If you are reporting from a private property and prefer privacy, indicate that to the agency; they can often accept reports with general location descriptors while still using the data for mapping and response.
Surveyors, whether volunteers or professionals, should use consistent protocols to ensure data quality.
Early detection and consistent reporting are the most effective tools Pennsylvania residents have to slow the spread of spotted lanternfly. By following these practical steps–observe carefully, document thoroughly, report accurately, and act responsibly–you can contribute directly to protecting farms, forests, and gardens across the state.