Don't forget mosquitoes, if you live somewhere that has them, too.
If you have any areas that get standing water, get mosquito dunks or granules as well. I bought a big jug, and still have most of it left almost a year later. Just sprinkle some in the standing water you can't empty or get rid of, and it'll keep the mosquitoes from breeding on your property as much.
Just like with manure management being a first line defense against flies, making sure you have as few areas of standing/stagnant water as possible is the first line of defense against mosquitoes. Depending on where you're located, the mosquitoes could be infected with West Nile virus, or carry equine encephalitis, I believe? It depends on where you live what they tend to carry and spread. It's probably best to minimize them, no matter what they carry in your area, though.
Good luck with your fly management program, and I hope you have a fairly fly free summer!
