Spotted Lanternfly inMercer County, PASPOTTED LANTERNFLY GUIDE
Mercer County sits on Pennsylvania's western border with Ohio, placing it at the leading edge of the SLF front advancing into the Shenandoah Valley steel and manufacturing corridor. Confirmed in 2023, spotted lanternfly reached Mercer County via the I-79 and I-80 corridors connecting the Pittsburgh region to Ohio. Sharon and the Shenandoah Valley communities have significant industrial and legacy manufacturing infrastructure — the same brownfield and rail corridor habitats that have historically accelerated SLF spread in eastern Pennsylvania. Grove City's commercial activity and regional transportation links add to the dispersal risk through this gateway county.
Pennsylvania is under a statewide spotted lanternfly quarantine. Moving plants, outdoor items, or vehicles out of quarantined areas requires inspection.
Highest activity zones
SLF Hotspots in Mercer County, PA
Sharon
Active zone
Hermitage
Active zone
Grove City
Active zone
Farrell
Active zone
Greenville
Active zone
Primary SLF food source
Tree of Heaven in Mercer County, PA
The Shenandoah River Valley's steel legacy brownfields in Sharon, Hermitage, and Farrell harbor dense Tree of Heaven populations in disturbed and industrial margin habitats that have proven highly favorable for SLF establishment. I-79/I-80 corridor medians through the county carry Ailanthus extending from the Pittsburgh metro westward toward the Ohio border. Norfolk Southern rail lines through western Mercer County have Ailanthus at track margins that provide additional SLF dispersal spine through this industrial corridor.
Identify Tree of Heaven →Local action resources
What To Do in Mercer County, PA
Report a Sighting
Every sighting in Mercer County, PA maps the invasion front. Report directly to PA Dept of Agriculture.
Report Now →Squish on Sight
See a spotted lanternfly? Kill it immediately — it is legal and encouraged in all states. Learn the best kill methods.
Full Fight Guide →Map ToH in Your Block
Tree of Heaven removal cuts off SLF food supply. Add ToH sightings to the community map to guide removal efforts.
View Sighting Map →Statewide resources
Full PA State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full PA guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Mercer County, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Mercer County, PA.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Mercer County, PA.