Spray the walls and ceilings with insecticide. Repeat when flies no longer drop from the surface because insecticide has lost its toxicity. Some insecticides can be mixed and applied with whitewash. Do not spray exposed Styrofoam insulation with the insecticide mixture. Flies Several products are approved for use as a feed or mineral additive to control flies.
Enough insecticide remains in the manure to kill or prevent flies from completing their development.
The insecticide must be mixed with either the feed concentrate or mineral mixture. For example, stirofos is registered to be fed at 70 milligrams per 100 lbs. of body weight per day. You need to know the weight of the animal being fed and the amount of feed consumed each day by this animal. Ear Tags Insecticide-impregnated ear tags have been approved for use on dairy and beef animals. Be sure tags are attached correctly.