(WHTM) – The Pennsylvania Department of Agriculture is expanding its spotted lanternfly quarantine to four more counties.

On Friday, the department said Bradford, Sullivan, Venango, and Wyoming Counties have been added to the list of Pennsylvania counties quarantined “due to confirmed populations of the invasive pest spotted lanternfly.”

The invasive spotted lanternfly was first discovered in the United States in Berks County in 2014. The state’s quarantine map now includes all but 10 of the 67 counties. Each of the 10 counties not in the quarantine map is in the northeast region.

More than half of the counties in the quarantine area reported “relatively small, isolated populations of lanternflies” last year.

Officials say the insect can destroy food and ornamental crops and spread by traveling on vehicles.

“As you clean up your yard or just enjoy beautiful Pennsylvania spring days, you can help keep lanternflies from becoming a summer nuisance and harming our valuable grape and nursery industries,” Secretary Russell Redding said. “Every spotted lanternfly egg mass you scrape and squash is 30-50 damage-causing insects that won’t hatch in May.”

Residents are encouraged to squash any spotted lanternflies they come across and scrape any eggs found on trees, vehicles, playgrounds, or other outdoor surfaces.

“The Shapiro Administration is committed to protecting and preserving the tremendous value agriculture brings to our economy and our daily lives,” Redding continued. “Funding research to develop safe, innovative pest control methods, monitoring and treating destructive pests like lanternflies aggressively, and fostering strategic partnerships between government and industry are all critical tools Pennsylvania has invested in to continue to control this destructive pest.”