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They are a type of parasitic wasp. They parasitize flies. I think they are just too expensive for what they do. I use a varity of methods, We have muscovys & skeeter vacs (they trap insects other than skeeters.). Our chickens go thru the dung piles to eat maggots & pupating flies. We have fewer flies every year, as our chickens learn to go after the dung piles. We started w/ hatchery chickens & they didn't know how to hunt. Each generation is better at hunting. If you pile your manure, it will likely breed flies, the chix can't get down to them. We leave ours out on the pasture, where the chix can get the the pre-flies.
There isn't really anyway to keep flies out of your pile, unless you catch them first. All you can do is see what you can do to keep the pupates from hatching. There are various lures that you could surround you pile with.