Spotted Lanternfly inNorthumberland County, PASPOTTED LANTERNFLY GUIDE
Northumberland County — confirmed for SLF in 2018 — is centered on Sunbury, the county seat, at the confluence of the Susquehanna River's North Branch and West Branch. This confluence point makes the county a critical SLF node: the Susquehanna River corridor, one of Pennsylvania's most significant natural SLF dispersal highways, comes together here and channels populations both north and south through the state. The county's coal region heritage — with Shamokin as the largest borough and extensive anthracite mine site landscapes — has created widespread Tree of Heaven colonization on disturbed industrial lands throughout the region. Shikellamy State Park provides river access that is both an ecological asset and a priority SLF monitoring zone as populations move along the watercourse.
Highest activity zones
SLF Hotspots in Northumberland County, PA
Sunbury waterfront on the Susquehanna River
Active zone
Susquehanna River North Branch and West Branch confluence
Active zone
Shamokin area coal region margins
Active zone
I-80 proximity corridors in northern part of county
Active zone
Shikellamy State Park river access areas
Active zone
Primary SLF food source
Tree of Heaven in Northumberland County, PA
Tree of Heaven is well established along the Susquehanna River corridor through Sunbury and the county's North and West Branch river margins, creating primary SLF dispersal pathways through Northumberland County's geographical center. The Shamokin area coal region's disturbed industrial landscapes are densely colonized by Ailanthus, providing extensive SLF host habitat adjacent to residential and agricultural areas. Shikellamy State Park river access road margins and the I-80 approach corridors in the county's northern sector are priority monitoring zones as SLF populations continue to move through this critical river junction landscape.
Identify Tree of Heaven →Local action resources
What To Do in Northumberland County, PA
Report a Sighting
Every sighting in Northumberland County, PA maps the invasion front. Report directly to Pennsylvania Department 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 Pennsylvania State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full Pennsylvania guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Northumberland County, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Northumberland County, PA.
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