The upper part of the Clarion River was pretty polluted about 15 years ago. It has since been cleaned up and now there's a black fly problem.

About 99 percent of the black flies that fly around your face are females. They act like the mosquito in that they require a blood meal.

If there is a good amount of rain that raises the water level, we have to wait for the water to come down so treating is delayed. During that period, we may miss a batch that hatches, which results in us receiving complaints (about black flies).

To be a part of this tonight is a thrill.