Can Livestock Mosquito Coils Kill Flies? Dual Mosquito & Fly Control on Farms
In summer, mosquitoes and flies often erupt together on livestock farms: mosquitoes harass animals at night, while flies spread enteric diseases by day. Many farmers ask: can livestock mosquito coils kill flies? The answer: they repel and kill flies, but less effectively than mosquitoes-dual control requires the right formula and placement. This article explains how livestock coils work on flies, their real-world effect, and a correct dual-control plan.
1. Why Livestock Coils Also Work on Flies
Livestock mosquito coils (stick coils) use pyrethroid insecticides. When lit, the active ingredient spreads with the smoke and attacks the nervous systems of mosquitoes and flies:
- On mosquitoes: fast knockdown and high kill rate, taking effect in about 10 minutes-the coil's main target;
- On flies: knockdown and repellency also occur, but flies are heavier, metabolize faster, and fly widely by day, so kill rates are lower at the same concentration.
In short, the coil is a product that "mainly kills mosquitoes while repelling and killing flies". When fly density is moderate, coils noticeably reduce fly landings; during fly outbreaks, supplementary fly control is needed.
2. Fly Effect by Coil Formula
| Formula | Mosquito Effect | Fly Effect | Best For |
|---|---|---|---|
| Standard | Good | Moderate, mainly repellent | Daily use, few flies |
| Strong | Strong | Good, repels and kills | High mosquito-fly density, hot humid sheds |
| Wormwood | Good | Moderate, mild and low-irritation | Sow and young-animal sheds, low fly pressure |
For sheds needing strong dual control (finishing pens, open large pens), choose the Strong formula: higher active-ingredient content gives stronger knockdown on flies. Combined with 1.2 m long sticks burning all night, coverage is wide and lasting.
3. Four Placement Tips to Improve Fly Control
Flies behave differently from mosquitoes, so adjust placement:
- Light earlier at dusk: flies rest on walls, railings and ropes at night. Lighting coils at dusk lets the smoke act on resting flies. See best time to light.
- Place points near fly resting surfaces: flies land on walls, partitions and pipes 1-2 m above ground. Place coils along shed walls so smoke spreads along these surfaces. See placement guide.
- Reduce strong airflow after lighting: fly control depends more on smoke concentration than mosquito control; keep doors and windows mostly closed for a while before ventilating.
- Treat manure at the same time: flies breed in manure and leftover feed. Coils alone cannot suppress breeding sources-daily manure removal and lime or larvicide treatment on manure areas are essential.
4. Combined Plan for Fly Outbreaks
When fly density is already high (visible clusters on walls and troughs), use a "coil + environmental management" combination, following Integrated Pest Management on farms:
- Night: Strong coils burn all night to suppress mosquitoes and resting flies;
- Day: remove manure, seal feed troughs, treat breeding sources;
- Physical tools: fly paper and lamps in walkways catch daytime flies;
- Chemical supplement: for safe combination of fly sprays and coils, see Using Fly Spray and Coils Together Safely.
For pen-by-pen plans on pig farms, read Mosquito Coils in Pig Farms.
5. FAQ
Q: Flies still fly after lighting coils-does it not work? By day, active flies move in and out of the shed, so smoke has limited effect on flying flies, but it works continuously on resting flies at night. Dual control means "night coils + daytime environmental management".
Q: Any difference from household coils for flies? Yes. Household coils are designed for small rooms and target mosquitoes; livestock coils are built for large, high-density animal spaces, with far greater smoke volume and coverage that also addresses flies. See livestock vs household coils.
In summary: livestock coils can repel and kill flies. For dual control choose the Strong formula, light at dusk, place along walls, and manage manure. To estimate quantity for your shed, see How Many Livestock Coils per Shed, or contact us for selection advice.