The spotted lanternfly (Lycorma delicatula) is an invasive species of insect that feeds on a wide variety of trees, with Ailanthus tree (“Tree-of-Heaven”) as one of its preferred hosts. Ailanthus is a prolific seeder and colonizer, and can grow 5 feet in a single season.

The spotted lanternfly has been found on campus. The College, in partnership with the USDA, is addressing the issue on several levels:

• As part of the library renovation, several mature Ailanthus trees were removed.
• The USDA checks the campus and chemically treats Ailanthus tree specimens with a trunk diameter larger than six inches.
• The USDA removes specimens smaller than six inches in diameter.
• The Arboretum also removes smaller specimens when discovered.

If you see a spotted lanternfly on campus, killing and disposing of the adult insect is all that is required. The adult is approximately one inch long and has forewings that are light brown with black spots with a speckled band at the rear.

If you see egg masses on campus, please report them to Arboretum staff by calling 610-896-1101. Egg masses are yellow-brown or white-gray in color and may appear textured or mud-like. Spotted lanternfly prefer to lay their eggs on a variety of smooth surfaces, including trees, buildings, and vehicles.

Learn more at: https://www.aphis.usda.gov/aphis/resources/pests-diseases/hungry-pests/slf/spotted-lanternfly