Fly Exterminator - Armstrong


Case Count



Introduce monthly during warm months. 

Our Fly Exterminators are predator to 95% of flies, including house flies, lesser house flies, horse flies, filth flies, bot files, biting stable flies, and various other fly species.

Less complete on the false stable fly, face fly, flesh fly, and horn fly because these species complete their life-cycle widely dispersed in pasture.

Reduction in fly population should be noticeable approximately 3 weeks after hatching.

Pest Fly Examples

Scientific names:

Muscidifurax raptorellus, Muscidifurax zaraptor, & Spalangia camerion

Protect your pets from fly-borne diseases with our Fly Exterminators. Our Fly Exterminators are a combination of three species of parasitoids that are highly specialized in targeting the pupae of host flies, interrupting development into adult pests. These tiny parasitoids have slender bodies measuring about 1-3mm in length, with brown to black coloration and transparent veined wings. They are nocturnal and go virtually unseen. They do not sting or bite, and are completely harmless to people and animals. Each species has slightly different environmental tolerances, peak activity periods, modes of action, and life-cycles that increase the effectiveness of keeping fly populations under control.


You may see large numbers of flies around your animals, but the fly breeding sites are most likely close to to manure or other moist, rotting organic matter areas.

  • Barns
  • Stables
  • Kennels
  • Chicken Coops
  • Feedlots
  • Compost Piles
  • Garbage Cans
  • Septic Tanks
  • Near (but not in) Water


Introduce monthly during warm months. Heavy infestations may require additional introductions.

Fly Exterminator Introduction Map

SMALL SIZE ANIMALS (Chickens, Ducks, Rabbits, & More)
100 Fly Exterminators per Animal

MEDIUM SIZE ANIMALS (Goats, Sheep, Dogs, Cats, & More)
500 Fly Exterminators per Animal

LARGE ANIMALS (Horses, Cows, Pigs, & More)
1,000 Fly Exterminators per Animal

Fly Exterminator Introduction Rates


Store Fly Exterminators indoors, in original packaging, and away from direct sunlight. Monitor daily for signs of movement. Hatching may take 7-14 days, depending on temperature, with Fly Exterminators beginning to hatch at 70°F. Pupae do not change in appearance after hatching. For optimal results, release within 24 hours of hatching. Wait until temperatures are consistently over 50°F before introducing. Fly Exterminators will self-distribute up to 100 yards.
  1. Locate fly breeding site. Please see Introduction Site information.
  2. Sprinkle Fly Exterminators near fly breeding sites and cover to protect from birds and rodents. OR Place Fly Exterminators in Hatching Bag and secure above the ground, out of direct sunlight, near fly breeding site.
  3. Locate other possible fly breeding sites and introduce any remaining Fly Exterminators.
  4. Introduce every 30 days during warm months.

How to introduce Fly Exterminators

FREE Hatching Bag(s) included with every order.

  1. Safe Application - Keep Fly Exterminators safely out of reach from birds and rodents.
  2. Target Application - Designed to ensure controlled and targeted application.
  3. Easy Release - Provide a contained environment for the hatching and dispersal of Fly Exterminators. These tiny parasitoids are smaller than an ant and can fit through the holes in the release bag.
  4. No Mess - Designed to minimize cleanup efforts, eliminating the need for post-application cleanup or the handling of potentially messy substances.

Dealing with a fly infestation can be stressful, unhygienic, and detrimental to your and your animals' quality of life, so start your Fly Exterminator program early! We offer monthly subscriptions that save you time and money. Plan your shipments during warm months to get ahead of a pest fly infestation.


For maximum fly control, introduce Beneficial Nematodes with your Fly Exterminators. Click here to learn more.

Beneficial Nematodes SC - Flea, Fly, and Soil Pest Exterminator

Guaranteed Sale Program Qualifying Items:
FLY-2KRP: 2,000 Pupae in Wood Shavings - Retail Hanging Pouch

Case Count: 6 Units per Case

Free shipping eligibility when ordering 2+ cases.

FLY-2KRP: 2,000 Pupae in Wood Shavings - Retail Hanging Pouch
FLY-5K: 5,000 Pupae in Wood Shavings - Paper Bag
FLY-10K: 10,000 Pupae in Wood Shavings - Paper Bag
FLY-50K: 50,000 Pupae in Wood Shavings - Paper Bag