Two Maryland state agencies are teaming up to address a black fly problem along the Potomac River, with a treatment operation planned for later this week.
The Maryland Department of Agriculture, working alongside the Department of Natural Resources, has announced plans to apply treatment to a designated stretch of the Potomac River near Harpers Ferry, West Virginia.
The treatment is scheduled to take place on Wednesday, June 24, 2026, with the operation set to begin at 8:00 a.m. The effort is aimed at reducing and controlling black fly populations in that part of the river.
