About 2 months ago, the flies showed up here at my house. The small ones are pesks but the big ones, I call horseflies, bite and hurt. I can't stand them around.
When I had a farm in upstate New York, between 2 large dairy farms I had problems with the horseflies in a big way. I put up these stink bags and they work great.
I recently had friends come from the states and they brough me some from Lowes. Wow! Big relief in one week. The first trap I put up Monday probably has 500 flies in it of the big and small size and lots of gnats too.
Warning. These are non-chemical, but they have a bag of something in them, that when you add water, is the worst smelling odor you can imagine. You will swear something has died if you are within 2 meters of the trap. Be sure to put downwind from your house.
My theory is that if I can get rid of them, I'll mostly be rid of them. Dead flies can't lay more eggs. And one fly can lay several 100 eggs a day. Hopefully I'm on the road to freedom. They will go away on their own in November, but I want them gone now.