I had a house next to a large farm in New Bremen, Ohio for a few years. I loved it out there, but the horseflies (greenheads, yellow flies, deer flies, and black B-52 bombers) were a problem during the summer. I tried the buglights and other things but they did not work very well. I bought this H-Trap upon recommendations from the locals that I met. They said that this was the best way to get rid of them fast. Unfortunately I had to sell that house after my client cut their IT contractors and I never had a chance to try it out. The box has never been opened/unsealed. The unit is brand new.
The manufacturer says this is how it works:
By placing the horse fly traps in strategically sunny locations, the inflatable black ball will absorb heat, thus putting off an infrared signature to attract the biting female horse fly to the ball rather than to the animals and humans nearby. Once positioned on the black ball, the females will try to bite their “victim” and after failing, they will follow their usual flight pattern, which is vertical. The green plastic conical hood guides horse flies into a centrally placed plastic collection bin, which from there they cannot escape.
Recommended coverage per horse fly trap is a 5 horse outdoor paddock or about 2.5 acres.
The manufacturer website says these traps are sold out and on back order. They retail at $339.00