(a) Remove all manure from livestock pens as frequently as possible. Calf and bull pens with animals in them require special attention. It is best to clean these pens once a week. Using sawdust instead of other materials for animal bedding reduces fly development. A clean livestock barn has fewer fly problems.
(b) Spread the manure thinly outdoors in order that fly eggs and larvae will be killed by drying, or stack this waste and cover with a black, plastic tarp.
(c) Eliminate silage seepage areas, wet litter, manure stacks, old wet hay or straw bales and other organic matter accumulations that may attract flies anywhere on the farm. Wet feed remaining at the ends of mangers will breed flies.
(d) Provide proper drainage in barnyards. Use clean gravel and other fill to eliminate low spots in livestock yards. Proper grading and tiling can reduce wet barnyards. Keep water troughs and hydrants leak-free.