Pennsylvania Officials Spraying Bacteria To Combat Pesky Biting Gnats
NORTHAMPTON COUNTY, Pa. (CBS) -- In Northampton County, spraying is taking place to fight black flies. They're also known as biting gnats and they can become very pesky during the warmer months.
Helicopters are spraying bacteria over waterways.
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The bacteria is lethal to black fly larva but is non-toxic to fish.
