The first spring we were here, the black flies were just terrible--clouds of them!!!
We couldn't go out side at all it was so bad!! The dogs would run out, pee, poop, then run back in!
Then one morning, I looked out the window and there were hundreds of Hueys hovering over the yard--it looked like D-Day!
Et voila!! No more black flies!!!
It was amazing! And such a relief!