An effective fly control program is not a simple operation. The poultry producer needs to integrate or incorporate the control of flies into the normal or routine operations. Newer, better ones are very slow in coming. This is because of the high cost of development, and the business risks of introducing new pesticides. Some major companies have discontinued research on, and marketing of insecticides.
Insects can develop resistance to some insecticides.
It's just good business to delay this phenomenon as long as possible through proper use. Managing manure so that it is not conducive to fly breeding is the most effective means of control. Fresh poultry manure generally contains 60 to 80 percent moisture. Fly breeding in this material can be virtually eliminated by reducing the moisture content to 30 percent or less, or by increasing moisture to liquefy it. Drying usually is preferable because it is easier to handle, occupies less space, and creates fewer odor problems than does liquid manure.