May 22, 2017 ....postponed to May 23
An aerial black fly (gnat) suppression operation will be conducted Tuesday, May 23 on the Juniata River, Conodoguinet Creek, Sherman Creek and Tuscarora Creek. The operation will start at 0800 and be completed by late afternoon, weather permitting. The operation will begin in Cumberland County and move up the Juniata River and end in Huntingdon County. Flights will be conducted in Adams, York, Cumberland, Dauphin, Perry, Juniata and Mifflin Counties. The helicopter treating the Juniata River and creeks will be a grey, red and blue Bell 206 with the tail numbers N659HA.

DEP will be dispersing Vectobac 12AS, which is a Bti product. Bti is short for Bacillus thuringiensis var. israelensis, which is a bacterial larvicide, not a chemical, and is the only product used in Pennsylvania's waterways for black fly suppression. Vectobac 12AS is a thick brown liquid resembling chocolate milk.