How to Control Flies and Pests in Feedlots

Managing flies and pests in feedlots is a critical aspect of livestock production. These pests not only cause discomfort to animals but also pose health risks, reduce productivity, and can lead to significant economic losses. Effective control requires a comprehensive approach that combines environmental management, chemical treatments, biological control, and ongoing monitoring. This article explores practical strategies and best practices for controlling flies and pests in feedlots.

Understanding the Problem: Why Control Flies and Pests?

Feedlots create an ideal environment for pest proliferation due to the abundance of organic waste, moisture, and animals. Common pests include:

• House flies (Musca domestica)
• Stable flies (Stomoxys calcitrans)
• Horn flies (Haematobia irritans)
• Mosquitoes
• Mites
• Rodents

These pests can:

• Transmit diseases such as E. coli, Salmonella, and pinkeye.
• Cause stress to animals, leading to decreased feed intake and weight gain.
• Contaminate feed and water sources.
• Create nuisance issues for workers and neighboring communities.

Effective pest control improves animal welfare, enhances production efficiency, and maintains a safer environment for workers.

Integrated Pest Management (IPM) Approach

An Integrated Pest Management (IPM) strategy combines multiple control methods to minimize pest populations in an environmentally sustainable way. The key components include:

1. Cultural Practices
2. Mechanical and Physical Controls
3. Biological Controls
4. Chemical Controls
5. Monitoring and Record-Keeping

1. Cultural Practices

Preventing pest breeding sites through proper management is foundational.

Manure Management

Manure is the primary breeding ground for many fly species.

• Frequent Cleaning: Remove manure from pens regularly—ideally daily or every few days—to break fly life cycles.
• Proper Storage: Store manure away from feedlot areas in well-managed piles or compost facilities.
• Dry Bedding: Use dry bedding materials such as straw or sawdust to reduce moisture levels that attract flies.

Feed Management

Spilled feed attracts pests.

• Clean up spilled feed promptly.
• Store feed in pest-proof containers.

Water Management

Standing water supports mosquito breeding.

• Drain or fill low spots where water accumulates.
• Maintain proper drainage systems around the feedlot.

Vegetation Control

Keep grass and weeds trimmed around the feedlot to reduce shelter for pests like rodents and ticks.

2. Mechanical and Physical Controls

Mechanical methods physically remove or block pests.

Fly Traps

Various traps can capture adult flies:

• Sticky traps: Hang near problem areas to catch flies landing on adhesive surfaces.
• Baited traps: Use attractants to lure flies into containers they cannot escape.

Traps are helpful in reducing fly populations but usually not sufficient alone.

Screens and Barriers

Install screens on windows, doors, and ventilation openings of barns or enclosed structures to prevent pest entry.

Fans and Air Curtains

Strong airflow from fans discourages flies from settling on animals or feed storage areas.

3. Biological Controls

Utilizing natural enemies can suppress pest populations sustainably.

Parasitic Wasps

Tiny wasps from families such as Pteromalidae lay eggs inside fly pupae, killing developing flies before they emerge.

• Apply commercially available parasitic wasp products regularly during fly seasons.

Predatory Insects

Certain predatory beetles consume fly larvae in manure piles.

Encouraging biodiversity by minimizing broad-spectrum insecticide use helps maintain beneficial insect populations.

4. Chemical Controls

Chemical treatments are often necessary as part of an integrated program but should be used judiciously to avoid resistance development.

Larvicides

Applied directly to manure or breeding sites to kill immature fly stages before they reach adulthood.

Common larvicides include:

• Organophosphates
• Insect growth regulators (IGRs)

Regular application timing is important—usually weekly or biweekly during peak fly seasons.

Adulticides

Adulticide sprays or dusts kill adult flies on contact.

Options include:

• Pyrethroids
• Organophosphates
• Carbamates

Use spot treatments on resting sites such as fences, walls, or animal housing structures rather than broad area spraying to minimize non-target effects.

Insecticide Ear Tags and Animal Treatments

For horn flies and stable flies that feed on cattle blood:

• Ear tags impregnated with insecticides provide ongoing control.
• Pour-on insecticides or dust bags treat animals directly.

Rotate insecticide classes annually or biannually to prevent resistance buildup.

5. Monitoring and Record-Keeping

Consistent monitoring allows early detection of pest problems and assessment of control effectiveness.

Fly Counts

Perform regular fly counts using standardized methods such as:

• Counting flies on animal legs, backs, or faces at set times.
• Using traps with known sampling periods.

Document counts along with treatment dates and environmental conditions for trend analysis.

Inspection of Breeding Sites

Regularly inspect manure piles, wet areas, and feeding zones for signs of larvae or pupae presence.

Additional Strategies for Specific Pests

Rodent Control

Rodents pose both health risks and physical damage threats in feedlots.

• Maintain cleanliness by promptly removing spilled feed.
• Seal gaps in buildings.
• Use rodenticides carefully according to label instructions.
• Employ traps strategically around feed storage facilities.

Regularly inspect rodent activity signs such as droppings or gnaw marks.

Mosquito Control

Mosquitoes transmit diseases like West Nile virus affecting livestock health.

• Eliminate stagnant water sources.
• Introduce mosquito fish (Gambusia affinis) into ponds where feasible.
• Use larvicidal treatments like Bacillus thuringiensis israelensis (Bti).

Consider adulticide applications during heavy infestations when appropriate.

Environmental Considerations

Maintaining environmental sustainability is vital while controlling pests in feedlots:

• Avoid overuse of chemical pesticides which can harm non-target organisms including pollinators.
• Use targeted application methods rather than blanket spraying.
• Incorporate biological controls as much as possible.
• Practice proper waste management to reduce habitats that sustain pest populations naturally.

Conclusion

Controlling flies and pests in feedlots requires a comprehensive integrated approach combining good sanitation, mechanical controls, biological agents, targeted chemical applications, and diligent monitoring. Success depends on understanding pest biology, timely intervention, adherence to best management practices, and environmental stewardship. Producers who invest effort into effective pest management can improve animal health and welfare while protecting productivity and profitability.