Every horse owner eventually faces the same question during fly season:
Should I use a natural fly spray or a chemical one?
The answer isn’t always simple. Some riders prefer natural ingredients for skin sensitivity and environmental reasons, while others rely on stronger chemical formulas when insects are overwhelming. Understanding the pros, cons, and potential risks of each can help you find the right balance for your horse.
Why Fly Control Matters
Flies, gnats, and biting insects are more than just annoying — they can cause real problems for horses.
Common issues include:
- Skin irritation
- Tail rubbing and mane loss
- Allergic reactions (such as sweet itch & Hives)
- Stress and agitation
- Potential transmission of disease
- Bot & Horse Flies
Effective fly control helps keep horses comfortable and prevents excessive stamping, tail swishing, and skin damage.
The Appeal of Natural Fly Sprays
Natural fly sprays have become increasingly popular as horse owners look for safer, more environmentally friendly alternatives to traditional insecticides.
Most natural formulas rely on plant-based ingredients such as:
- Citronella
- Lemongrass
- Peppermint oil
- Eucalyptus
- Cedarwood oil
- Geranium oil
These oils work primarily by masking the horse’s scent or repelling insects naturally.
Pros of Natural Fly Sprays
✔ Generally gentler on sensitive skin
✔ Lower environmental impact
✔ Free from harsh pesticides
✔ Often smell better than chemical sprays
Cons of Natural Fly Sprays
Natural products typically don’t last as long as chemical formulas.
That means:
- More frequent application
- Less protection during heavy fly pressure
- Reduced effectiveness in humid climates
For some barns and environments, natural sprays work perfectly. For others, they may not be strong enough during peak fly season.
The Problem With Some Chemical Fly Sprays (Chemical Controversy Debate)
Traditional fly sprays often rely on synthetic insecticides designed to kill or repel insects quickly.
Common active ingredients include:
- Permethrin
- Pyrethroids
- Cypermethrin
- Piperonyl butoxide
These chemicals are effective — sometimes very effective — but they can come with drawbacks.
Potential concerns
Some horses may experience:
- Skin sensitivity
- Dryness or irritation
- Respiratory sensitivity from heavy sprays
- Environmental concerns when sprayed near water sources
Additionally, overuse of insecticides can contribute to insect resistance, making some products less effective over time.
The Happy Medium: Smart Fly Control
For many horse owners, the best solution is a balanced approach.
Instead of relying exclusively on natural or chemical sprays, combining strategies often works best:
Layered fly control methods
- Fly sheets and masks
- Manure management around the barn
- Fans in stalls (flies struggle to land in moving air)
- Strategic turnout times (Early Mornings)
- Occasional stronger fly sprays when insect pressure is high
This reduces the need for constant heavy chemical use while still keeping flies under control.
My Personal Fly Spray Favorites
After trying many options, there are two that I consistently reach for during fly season.
Clean fly spray: Electric PONY
Chemical Fly SPray: UltraShield® Absorbine Gold
These options strike a good balance between effectiveness, ingredient safety, and skin tolerance, especially for horses that are sensitive to harsh products.
A barn secret is Skin SO Soft for insect repelling around nose and areas not covered by protective fly gear. Avon SKIn so soft.
Tips for Using Fly Spray Safely
Regardless of which type you choose, always follow these best practices:
- Avoid spraying directly into eyes, ears, or nostrils
- Use a cloth or sponge for the face area
- Test new products on a small patch of skin first
- Avoid excessive over-application
- Reapply according to label directions
Final Thoughts
The truth is, there’s no one-size-fits-all fly spray.
Natural sprays can work beautifully in some environments, while chemical formulas may be necessary during intense fly seasons. The key is finding a solution that keeps your horse comfortable without exposing them to unnecessary irritants.
Often, the best approach lies somewhere in the middle — combining smart management with thoughtful product choices.
