I LOVE the H trap! It’s expensive, but worth every penny. After a couple of years, the biting flies are virtually gone.
Do you use the lure or just the ball?
I’ve never used a lure, just the ball. The first year, I trapped so many bugs, but I still had to spray the horses daily. By year three, there were barely any biting flies (except mosquitoes) and I just spray a couple times a week. It’s well worth it.