Fly Control Program

fly-control-2Houseflies and stable fly populations can generally be reduced by a combination of diligent clean-up and fly control– not letting manure and old hay/bedding build up to create breeding sites. Several types of flies lay their eggs in fresh manure and rotting organic matter so tackling the problem where it starts makes good barn management sense.

Keep It Clean

Texas A&M University did a study several years ago and found that if areas where big bales are fed in feeders aren’t cleaned up, this creates an ideal breeding ground for flies which definitely makes fly control a must. The researchers estimated that the area around one round feeder could produce more than a million stable flies.

In the spring, before flies emerge, the first thing to do when weather warms up is to move the feeders and spread wasted hay around so it will dry out, recommends Dr. Bill Clymer, a Texas entomologist. Or, remove the waste to a separate area for composting. Otherwise, the material will stay wet through the summer and continually provide breeding sites for stable flies.

Wasp Versus Fly for Fly control

The second line of defense is to try to keep fly larvae from hatching. This is where parasitic wasps can be beneficial. Wasps can be purchased from several different suppliers and can help reduce fly larvae by about 90 %. Even though these wasps are present in the environment– wherever there are flies– there are not enough of them to control the fly population unless you tip the scales in your favor by putting out more wasps. A female fly lays three times the number of eggs laid by a wasp, according to Clymer.

The wasps work best for fly control if there are just a few breeding sites and you can put out enough wasps to deal with the fly maggots. These tiny nocturnal wasps are almost too small to see, and spend their entire lives on or near manure. Because they do not sting, adult wasps are harmless to humans/animals. The females search through manure and lay eggs in the pupae of houseflies, stable flies, horn flies and any other flies that breed in manure. The wasp eggs hatch quicker than the fly eggs and the wasp larva use the dormant fly maggots as food, killing the fly before it can fully develop.

Parasitic wasps give more control in dry climates and during dry years. During a wet season, fly control can be difficult– which provides a more ideal habitat for breeding flies– the wasps may have a tough time dealing with the mushrooming fly population.

Assuming an average climate, the number of wasps needed for fly control is generally based on the number of animals in the barn, says Clymer. Wasp suppliers recommend releasing them early, before flies become numerous, and putting out more wasps every 30 days throughout the fly season, spreading them around in corrals and barns– wherever there’s manure. A paddock with one or two horses needs 5,000 wasps each month, whereas a facility with three to five horses would need 10,000 wasps per month, and a larger herd should have about 1,000 to 2,000 wasps per animal, per month. Parasitic wasps will not make up for lack of sanitation, but used in conjunction with manure/bedding/hay cleanup, they can be helpful.

Wasp suppliers recommend releasing them early, before flies become numerous, and putting out more wasps every 30 days throughout the fly season, spreading them around in corrals and barns– wherever there’s manure.

To manage and treat fly problems, we utilize Maxforce Fly Spot Bait, an indoor/outdoor spray that baits and kills common house flies in 60 seconds or less. Maxforce lasts for up to six weeks and is low odor, so your property won’t stink or smell while it’s working.


  • Uses a seductive pheromone
  • Perfect for inside commercial establishments
    and outside of residents and commercial buildings
  • Can be used as a spray-on or paint-on
  • Results within 60 seconds

We also utilize fly traps, specifically the Flypod fly trap, one of the most effective fly killers available. The Flypod sits discreetly in any home or work environment, utilizing a high-powered 18 watt UV bulb and pheromone laced glueboard to attract any nearby flies or pest. Once a fly crawls up or enters the pod, they will be unable to escape. Their body will remain out of sight until emptied.

In addition to the Flypod, we also use the Luralite Cento Plus, a flying insect and fly control unit that is designed to look like a decorative wall light. The Luralite system allows us to control flies in a clean, hygienic way. Plus, its design makes it ideal for us in public areas like stores, restaurants and office, where discretion is a must.

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A Hudson Service Company Since 1994®