Spotted Lanternfly inBethlehem, PASPOTTED LANTERNFLY GUIDE
Bethlehem confirmed SLF in 2019, adjacent to Allentown in the Lehigh Valley. The former Bethlehem Steel brownfield — now the Steel Stacks / ArtsQuest campus — is a classic Tree of Heaven habitat: disturbed industrial land heavily colonized by the invasive tree. Lehigh Valley Hospital campus and the historic district's street trees are also active zones.
Where it's showing up
Key Neighborhoods
Highest activity zones
SLF Hotspots
Steel Stacks / ArtsQuest campus
Active zone
Saucon Creek trail
Active zone
Monocacy Creek greenway
Active zone
Sand Island park
Active zone
Primary SLF food source
Tree of Heaven in Bethlehem, PA
The Steel Stacks brownfield is a textbook TOH colonization site — disturbed industrial land with minimal competition allows Tree of Heaven to dominate, and SLF populations thrive there. Saucon Creek and Monocacy Creek greenways provide habitat corridors extending SLF throughout Bethlehem's suburban landscape.
Identify Tree of Heaven →Local action resources
What To Do in Bethlehem, PA
Report a Sighting
Every sighting in Bethlehem, PA maps the invasion front. Report directly to PA 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 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 Bethlehem, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Bethlehem, PA.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Bethlehem, PA.