Fly Parasites

Fly Parasites
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Price: $22.85
Product ID : FPP10



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Larvae/Pupae Control:

Control Flys with Fly Parasites, the natural enemy

  • Kill developing flies.
  • Break the life cycle of the fly.
  • Attack fly larvae and pupae

Beneficial Nematodes

  • Attack fly larvae
  • Required only 1-3 applications per year.
  • Gives extra control where large numbers of larvae are observed.

Manure Management/Sanitation:

  • Remove manure regularly.
  • Compost waste properly.
  • Repair leaky water devices.
  • Keep feed storage areas dry.

Our fly parasite predators are a combination of 3 different species: Spalangia cameroni, Muscidifurax zaraptor and Muscidifurax raptorellus. Using all three different species will reduce the fly population more effectively. They are small, harmless (to humans and animals) beneficial insects that nature has programmed to attack and kill flies when the pest is in its immature pupa stage. The female Fly Parasite will deposit her eggs inside the pupae and once hatched, the tiny parasite larvae consume the inside of the pest fly pupae. Once inside, the eggs hatch inside the fly pupa and feed on the developing fly. After two to three weeks of feeding, an adult fly parasite emerges to repeat the cycle. Each female fly parasite can kill approximately 100 immature flies in her lifetime. This need provides a strong and natural incentive to do all the work: search and destroy. Since their only interest is the pest fly pupae, they will not bother humans or animals.


It is best to release Fly Parasites throughout the season for several reasons: pests produce more eggs in a shorter period of time since their life cycle is much shorter and flies come in from elsewhere. Also, releasing small amounts of Fly Parasites over a period of time (weekly, every other week or monthly) has proven to be more effective than a large release.

For best results, start releasing before flies become a problem. The parasites do not attack the adult flies, thus measures need to be undertaken to keep the existing population as low as possible. Use of traps and baits is recommended. If a short-lived natural pesticide is necessary, try to avoid the breeding sites where parasites are active. It will do more harm than good there.

Along with the fly parasites you should employ a combination of measures to achieve the greatest reduction of flies: cultural control (sanitation), manure management (disposal), and water management (fly larvae need a moist environment to grow).

Fly Parasite release rates, as with any beneficial insect, depend on several factors. The following guidelines have been successfully tested under normal pest conditions:

  • Large animals (horse, cow, etc.) – 500 parasites per animal
  • Medium animals (sheep, goat, etc.) – 250 parasites per animal
  • Small animals (birds, rabbits, etc.) – 50 parasites per animal
  • Manure/compost piles – 5 parasites per cubic foot

Shipped Free (USPS – First-Class Mail) We do everything we can to ensure safe arrival of your beneficial insects.

Target Pest:

Controls flies in animal manure accumulations and other filth fly breeding sites. Very effective against the housefly, biting stable flies, garbage flies, and the lesser housefly which make up to 95% of the flies in manure and other site accumulations. Five percent of the other flies are also parasitized, such as false stable flies, face flies, flesh flies and horn flies, but control is less complete on those flies which complete their life cycle widely dispersed in the pasture.


These small parasitic wasps are the most natural enemy of flies during the pupa stage. We provide several species of the tiny wasps in the genera Muscidifurax and Spalangia that attack and have adapted to different climates with a higher proportion of Spalangia in proportion to Muscidifurax. The eggs of the parasitic wasps are laid inside the flies pupae and the developing flies provide food from within for the young wasps.

Parasitic wasps do not bite, sting, swarm or bother anything else, humans or animals included. Parasitic wasps are nocturnal and are rarely seen during the day. They operate to a depth of 8 inches in the manure, homing in with their biological radar on fly larvae that are about to pupate.

Product information:

Parasitic wasps arrive in wood shavings developing inside the fly pupa and when fully grown they will cut a hole in the pupal case and exit as adults searching for more fly larvae, seeking to lay their eggs where the flies pupate. The parasites must not be left in direct sunlight or hot areas. They need to be held at 70° to 80°F, increasing to 85°F for more rapid emergence. They should be emerging and ready to release within a day or two.

  • Gnat-sized, nocturnal, and burrow into the soil.
  • Can be used to treat dogs, poultry, swine, feed lots, dairies, and other facilities where flies are a problem.
  • Will NOT bite or harm humans and animals.
  • Reproduce in 1-2 weeks, constantly reinforcing the parasite population.
  • Sold in the form of parasitized pupae, and are easy to disperse.
  • Travel up to 80 yards to find food sources (fly pupae)
  • Adaptable to all climates.
  • Bio-Balanced Fly Control is the long overdue solution for livestoock owners, breeders, and trainers.
  • Bio-Balanced Fly Control programs are the safest, most cost effective way to control filth-breeding flies!

Parasite Application

Your insects arrive in a bag as parasitized pupae in a sawdust medium. The pupae are at various stages of development. Store at room temperature away from dogs and ants. Check for hatching over the next day or two by holding the bag up to a light source. When the first gnat-like parasites appear inside the bag it's time for application. Once dispersed, hatching will continue over the next week.

The parasites are nocturnal, thus the optimal release time is dusk. Apply the parasites around the edges of "hot spots" areas where manure and urine are accumulated - where flies are crawling and breeding. Scratch a 1/2" hole in the ground with your heel, drop in a tablespoon of the sawdust and pupae mixture, and cover the hole with dirt, manure, or straw. Repeat this process every 10-20 feet until the package contents are gone. Use a little extra in problem "hot spots".



Buglogical has designed a Fly Control Program using regular releases of fly parasites and beneficial nematodes.

First, use regular releases of fly parasites based upon the prescriptions to the right.

Second, use beneficial nematodes once or twice a year to treat manure piles or any areas where fly larvae populations may be abundant.

Suggested Prescription

No. HorsesNo. ParasitesFrequency
1-55,000Every 3 Weeks
5-105,000Every 2 Weeks
10-1510,000Every 3 Weeks
15-2010,000Every 2 Weeks

Good sanitation is the foundation of any successful fly control program. In most cases, removing breeding material is the most feasible means of breaking the fly life cycle. Corrals, run-in sheds and barns should be designed to facilitate the rapid and efficient removal of manure and other fly-breeding materials. Feeders should be constructed to minimize waste and prevent manure and feed from accumulating beneath them. Fly breeding materials should be removed and disposed of at least weekly. Large round hay bales should be stored on a well-drained site. Sanitation should be completed if fly breeding is to be minimized. Areas commonly missed in clean-up include around fence posts, outside and under fences, feeders or hay racks, corners in barns and stalls, around silos or other feed storage areas, and areas around water sources. Manure and other fly breeding materials are most easily disposed of by spreading them thinly on pasture or cropland. Manure can also be stock-piled in one place and composted to reduce fly breeding problems. However, to prevent flies from developing in the outer layers, cover the waste with plastic. Fly development can be inhibited if manure and other fly breeding materials are kept dry. Corral areas should be designed to promote adequate drainage and eliminate wet spots where fly breeding is more likely to occur. Similarly, good drainage away from manure stockpiles will also promote drying and help reduce fly breeding. Automatic waterers should be maintained properly to prevent leaks. In addition to sanitation, more traditional methods of fly control should not be ignored when instituting a fly control program. Screening is an excellent way to keep flies out of areas, such as feed rooms, tack rooms and box stalls. Fans directing a blast downward and outward above doors will help prevent flies from entering barns. If only a few flies are present, sticky fly tapes can be used as a remedial measure. Other means of non-chemical control are less effective. For example, electric fly zappers are of limited value and are usually not effective in areas where flies are actively breeding. The same is true for the numerous fly jugs and traps available. These devices may trap a few flies, but are of little value in reducing total fly populations where active breeding is taking place.

Biological control is another non-chemical method promoted for house fly and stable fly control. Several species of parasitic wasps may be purchased to develop a good fly control program. With this method, the female wasps deposit their eggs in the fly pupae and the wasp larvae then kill and consume the developing fly. Which will provide long-term fly control.

Fly predators are naturally occurring enemy of all manure breeding pest flies. However, they are usually not found in a large enough population to control an aggressive fly population. During the fly season these parasitic wasps must be replenished about once every 3 weeks, or more frequently. They are simply not able to multiply in sufficient numbers to control the vast number of flies usually present around horse stable areas. One release of the fly parasites can temporarily reduce the population of lies. Fly parasites will travel up to 80 yards to find a food source (fly pupae) so keep that in mind as you are distributing them around the edges of “hot spots” – areas where manure and urine are accumulated and thus where flies are crawling and breeding. Fly parasites do not bite or sting humans or other animals and are so tiny that they go largely unnoticed. These wasps are harmless to animals and people so that they are a safe, non-toxic means of biological control both stable and house flies. Fly parasites are another tool that should be considered when fighting the battle against flies on horse facilities.

Product Reviews

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Reviewed by dawnjo13
01/03/2011 - 05:57:30 AM
Parasitic Wasp
I've had great success using these to control white fly in a greenhouse setting. Very easy to use and great results.

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