I've got a fly problem that is just out of control. They are your common house fly but they are everywhere!! I'm sure they are being attracted by the chicken coop, but I'm not moving that so I've got to figure out how to get rid of the fly's. Is there some sort of parasite that will kill them? Any help would be greatly appreciated!
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I have chickens, but I don't have a fly problem. I have garden spiders. They are all over the place. Two years ago, I noticed a three or four in the garden. They spun egg sacs and left them in odd places, so I would carefully move them to where they might be a little more protected. Last year, when they started hatching, there were hundreds, all over the place. I had a kumquat tree that was covered with them, and they managed to disperse throughout the garden. Last winter, there were even more egg sacs than the winter before. Again I carefully moved some, spread them around. Now I have to watch where I step in the garden, as the spiders seem to be everywhere. Up in the eaves, inside the fig trees, on the fences, under the deck, anchored to a trellis, there are a whole mess of them around here. But little in the way of flies.
If your chickens are free ranging, they will find these spiders a tasty snack, but enough should be out of reach, that if you look out for them, they can and will take take of your flying insect problem.
My guess would be that if they are focused around the chickens that 1. the yard or coop is too wet and/or does not have enough mulch, or 2. that you are feeding the chickens too much grain or commercial feed, so that they are unmotivated to "work" the yard and any trash/scraps you are giving them. Properly motivated chickens in a relatively dry, fluffy-mulch yard should pretty much keep up with any maggots trying to breed there. But if the mulch gets soggy and packs down so they can't scratch it up, maggots can breed up under there. And some of the meat breeds especially are lazy by nature, and will simply sit by the feeders and wait to be fed. I feed my layers only enough so that it is all gone in a few hours, and they spend the rest of their time "working the yard" I don't get 100% laying....but I don't have hardly any flies either.....