Black flies are especially bothersome this year in Pennsylvania

06.29.20 | Terry Diener

The Pennsylvania Department of Environmental Protection announced on its Facebook page this past week that it is aware of an increase in the black fly – commonly known as gnats – population in the northeast portion of the state.

Weather conditions this year have been conducive to producing large populations of the flies, according to the post. DEP has been treating the north branch of the Susquehanna River and will resume treatments of other river systems and local streams in early July to try and control the larval population.