Watch a short YouTube video on Livestock Fly Control.
Introduction
Livestock flies are not only a nuisance for horses (Photo 1), cattle, and other livestock, but they also spread disease and cause stress in animals. Fortunately, these flies can be effectively and naturally controlled by releasing tiny, beneficial parasitic wasps that are non-stinging, environmentally friendly allies that serve as a powerful tool in integrated fly management programs for stables.
Common Fly Pests Affecting Livestock
Knowing the target pests is key to effective control. The most common nuisance and disease-spreading livestock flies include:
- Horse Fly (Tabanus sulcifrons): Breeds in horse manure and annoy horses (Photo 2).
- House Fly (Musca domestica): Breeds in manure and decaying organic matter and spreads harmful bacteria.
- Stable Fly (Stomoxys calcitrans): A biting fly that feeds on blood, causing pain and reduced weight gain.
- Horn Fly (Haematobia irritans): Stays on cattle almost constantly, feeding frequently and reducing productivity.
- Face Fly (Musca autumnalis): Clusters around eyes and nose, spreading diseases like pinkeye.
- Blow Flies (Calliphoridae family): Attracted to wounds and decaying tissue, increasing infection risk (Photo 3).
What Are Beneficial Fly Parasites?
Beneficial fly parasites are tiny, non-stinging insects that naturally control pest fly populations around livestock. These parasites, often called parasitoid wasps, lay their eggs inside the pupae (Photo 4) of livestock flies such as house flies and stable flies. As the parasite larvae grow, they consume the developing fly, preventing adult flies from emerging and breaking the life cycle. This process helps reduce the number of nuisance flies without the need for chemical pesticides. By lowering fly populations, beneficial parasites reduce stress, and help prevent the spread of diseases. They are an environmentally friendly and sustainable solution for protecting livestock from pest flies.
Common Species of Fly Parasites
Several species of parasitic wasps are used in biological fly control programs. Each species has slightly different behaviors and environmental preferences, making a combination approach most effective.
1. Muscidifurax raptor: This is one of the most widely used fly parasites. It prefers drier environments and is highly effective in manure where house flies and stable flies breed (Photo 4).
2. Muscidifurax zaraptor:Similar to M. raptor, this species works well in confined animal areas and is known for its strong host-seeking ability.
3. Spalangia cameroni: This species is excellent in wetter conditions and burrows deeper into manure to find fly pupae. It complements Muscidifurax species well.
4. Spalangia endius: A versatile parasite that adapts to various climates and manure conditions. It is particularly effective in mixed livestock environments.
5. Spalangia nigroaenea: This species is highly resilient and performs well in challenging environmental conditions, including compacted or older manure.
How Fly Parasites Help Livestock
Using beneficial fly parasites to control livestock flies offers several advantages, including reducing fly populations without chemical pesticides, lowering animal stress and disease transmission, and improving animal health. They are also safe for humans, pets, and the environment.
Recommended Release Rates of Fly Parasites
Proper release rates are essential for success. The number of parasites needed depends on the type and number of animals, manure volume, and fly pressure.
Weekly Rates for Animals
Horses or cows:
- 1 animal = 1,000–2,000 parasites
- 5 animals = 5,000–10,000 parasites
- 5–20 animals = 10,000–50,000 parasites
- 20+ animals = 50,000+ parasites
Sheep or goat: 200–500 parasites per animal
Poultry facilities: 1,000–2,000 parasites per 100 birds
Timing and Frequency
For effective fly control, release wasps in early spring before fly populations build. Continue weekly or biweekly applications throughout the season, depending on infestation levels, and increase release rates during peak populations in the summer months. Target fly breeding areas, especially manure piles and moist organic matter. To enhance effectiveness against livestock flies, combine two species of parasitic wasps—Muscidifurax raptor and Spalangia cameroni—and also use fly traps.
Conclusion
Beneficial fly parasites including Muscidifurax raptor and Spalangia cameroni are a safe, natural, and highly effective solution for controlling nuisance livestock flies like house flies, horse flies, cattle flies, stable flies, and horn flies. By using proper release rates and maintaining a consistent program, livestock owners can significantly reduce fly populations and improve animal health and comfort.