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Andrea Malik mixes a potion of BTI, deadly to black flies...
Andrea Malik mixes a potion of BTI, deadly to black flies...

Taming black flies in Colton

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It's one of the cruelest fates dealt the North Country. The snow's gone. The warm sun's finally back. Just when we're dying to bask in spring...the black flies begin to swarm - and bite. More than 30 towns in the region fight back. They treat 3500 miles of streams to kill the black flies before they even hatch. It's all done by hand -- dozens of people bushwhacking miles through the deep woods to deliver doses of a bacteria known as BTI. One woman in St. Lawrence County has dedicated 22 years of her life to battling the black fly. David Sommerstein profiles the "black fly diva."

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...then sprays it in moving streams.

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