for flies? For noseums? for horse flies?
For regular black flies, can’t beat these.
the bin has caught the most, but it also caught bees and wasps somehow.
For stable flies I like the Knight Stick: https://www.bugjammer.com/knightstick/index.htm. The website is a bit low-budget but the traps do work once you find the right location for them.
For horseflies and greenheads I made a homemade trap modeled on the crazy-expensive Horse Pal: http://www.bitingflies.com/. Pics of mine attached. It’s just plywood and a beach ball spray-painted black, with a mesh screen with holes cut in it to allow flies to fly up into the clamshell containers. Every spring I repaint the beach ball and get new clamshell containers from the grocery store salad bar. It catches more greenheads than horseflies and you may have to move it around a bit before you find the right spot, but it works pretty well for the price!
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For stable flies I like the Knight Stick: https://www.bugjammer.com/knightstick/index.htm. The website is a bit low-budget but the traps do work once you find the right location for them.
For horseflies and greenheads I made a homemade trap modeled on the crazy-expensive Horse Pal: http://www.bitingflies.com/. Pics of mine here: https://thesmallhorsefarm.blogspot.com/2016/07/biting-fly-trap.html. It’s just plywood and a beach ball spray-painted black, with a mesh screen with holes cut in it to allow flies to fly up into the clamshell containers. Every spring I repaint the beach ball and get new clamshell containers from the grocery store salad bar. It catches more greenheads than horseflies and you may have to move it around a bit before you find the right spot, but it works pretty well for the price (which was almost nothing)!
I also use the captivator type traps, third year using them and we have so many less flies.
Love this trap for big biting flies. Works very, very well. Caught at least 50 of the big, black, biting flies when they first came out a week or so ago. Now, none to be seen. Catches the B-52s as well. Expensive, but supports a small business and I have had mine for close to 15 years (with replacement parts which are easy to order through the site). Cannot say enough good things about my experience with this.
Caveat, the website is horrible.
I have the Epps Biting Fly Trap. In the right location as others have said, it catches lots. Couldn’t believe the first year how many I scooped out daily. It does also get ‘June bugs’, bees/wasps and other flying insects at times.
HorsePal fly trap and BugBall seem to do the job here this year 
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How do you clean/start over with the BugBall? Clean is one of the things I really like about the HorsePal fly trap over the Epps – no scooping dead bugs out of water.
I can third that the Horsepal fly trap works. At least it definitely catches horse flies and the big bombers and some deer flies. Does it keep the population down is another question. This is my third year with it, and the first year I didn’t get it until July, so I missed a whole month of egg laying. Last year I caught quite a bit, and this year I got it out as soon as I saw my first horse fly, the last week of May. I’m still catching them, so I hope I’ve caught the population early enough to make a difference. I figure every one I catch is one that’s not biting, so it can’t hurt!
Plus, it’s very satisfying to watch them get caught. I’ve been known to bring a chair out there around 5:00 pm for a cocktail and watch the flies enter the trap and laugh gleefully.
Hahaha. I have done the same, sans chair and cocktail. I found that I caught tons the first few years, then for ten years almost none — and saw almost none on the property. This year, for whatever reason (could be weather, could be the influx of nearly 40 horses next door) I am catching bucket loads again.
