Spotted Lanternfly inChester County, PASPOTTED LANTERNFLY GUIDE
Chester County is one of Pennsylvania's most economically vulnerable SLF counties — confirmed in 2018, it is home to Kennett Square, the self-described "mushroom capital of the world," as well as extensive Brandywine Valley horse farms and significant vineyard acreage. SLF populations are now deeply established throughout the county. The Brandywine Creek corridor has become a major SLF highway, and the Longwood Gardens area and Route 30 corridor show consistently high adult counts through the fall season.
Highest activity zones
SLF Hotspots in Chester County, PA
Brandywine Creek corridor
Active zone
Kennett Square mushroom farming area
Active zone
Longwood Gardens area
Active zone
Route 30 corridor
Active zone
Brandywine Valley horse farms
Active zone
Primary SLF food source
Tree of Heaven in Chester County, PA
Tree of Heaven is dense along the Brandywine Creek corridor and Route 30 in Chester County, creating natural SLF spread pathways through the heart of the Brandywine Valley. The proximity of ToH to Kennett Square mushroom operations, horse farms, and vineyards makes Chester County a high-priority agricultural monitoring zone.
Identify Tree of Heaven →Local action resources
What To Do in Chester County, PA
Report a Sighting
Every sighting in Chester County, 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 Chester County, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Chester County, PA.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Chester County, PA.