Whats the best way to get rid of flies permanently in my backyard?

Question:

Answers:
You have to understand that control is the best you can do. If they cannot live there, you cannot be there. Those are just the facts. They are better at adapting then humans will ever be. They can be they first things back at chemical disasters, or nuclear ground zero, blasts.

I'm sure that is just frustration talking. Lots can be done to control them and keep them below nuisance levels.