If anyone is wondering how to make a fly trap, here are three examples .

The ones I made looked most like the first one, except I used old window screen material for the funnel. I think this gets the bait odor out more. An old pickle jar works well for the container. And I threw some old meat in the water at the bottom. (Meat from a skunk carcass worked well, and I usually had plenty of it around, but I don't think it really matters much).

Put the trap a fair distance away from the porch, near a trash can or compost pile, wherever flies congregate. If you have a barn, it wouldn't hurt to have one in there as well.

If you raise chickens, a couple of these traps can help with the feed bill.

Onward and upward,
airforce