The spotted lanternfly damages plants as it sucks sap from branches, stems and tree trunks. The repeated feedings leave the tree bark with dark scars. Spotted lanternflies also excrete a sticky fluid, which promotes mold growth, further weakens plants and puts our agriculture and forests at risk. Butler Eagle file photo

Butler County residents are advised to be extra vigilant during the coming months as the spotted lanternfly population reaches adulthood.

Since the first spotted lanternflies entered the United States via Berks County in 2014, the species has spread to 14 eastern and midwest states, according to the U.S. Department of Agriculture.

The spotted lanternfly is considered an invasive species and a threat to all local plant life, and has been known to feed on dozens of plant species. The calling card of a spotted lanternfly is the dark, sticky fluid it leaves behind on plants it has devoured.