Final Treatment of the 2017 Season
August 4, 2017 
An aerial black fly suppression operation has been scheduled for Friday, August 4 on the Main Stem Susquehanna River and Swatara Creek. This operation will begin in Shamokin Dam at 0700 and move south ending in York County. Flights will be conducted in Snyder, Northumberland, Perry, Juniata, Dauphin, Cumberland, Lancaster and York Counties. The helicopter will be a Bell 205 with the tail number N638HA and is painted red and yellow..
Helicopter Applicators Inc. will be dispersing Vectobac SC, which is a Bti product manufactured by Valent Biosciences. 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 SC is a thick brown liquid resembling chocolate milk. The helicopter will fly low near tree top level and release the Vectobac SC at various predetermined positions on each stream.