Fly Control for Horses: A Guide to Sprays, Masks, Sheets & More

If you own horses, you know that fly season can turn a peaceful afternoon at the barn into a constant battle of tail swishing, stomping, head shaking, and irritated horses.

The good news? There isn't just one way to fight flies.

From traditional fly sprays and wipes to fly masks, sheets, boots, feed-through products, traps, and barn management, today's horse owners have plenty of options. The trick is figuring out which type of fly control makes sense for your horse and your environment.

And often, the best results come from using several methods together rather than relying on a single product.

Why Is Fly Control So Important?

Flies are more than an annoyance. Biting insects can cause significant irritation, and flies can also contribute to the spread of disease.

Some horses are particularly sensitive to insect bites and may rub their faces, stomp constantly, or develop irritated areas from repeated biting.

That's why fly control is really about two things:

Keeping flies away from your horse and reducing the number of flies around your horse's environment.

University extension programs generally recommend an integrated approach that combines sanitation, physical barriers, repellents, and environmental control rather than relying on one product alone.

Let's look at the different options available.

1. Fly Sprays

Fly spray is probably the first product most horse owners think of when they hear "fly control." These products are designed to be applied directly to the horse and can provide temporary protection against flies and other biting insects.

There are several types available, including:

• Ready-to-use sprays
• Concentrated sprays that are diluted before use
• Sweat-resistant formulas
• Repellent sprays
• Products containing insecticides
• Products marketed with more natural ingredients

When are fly sprays useful?

Fly sprays can be particularly convenient when you're getting ready to ride, turning your horse out, or dealing with a sudden increase in fly activity. However, don't expect one application to last indefinitely. Sweat, rain, bathing, sunlight, and dirt can reduce how long some products remain effective.

Tip: Always read the product label carefully and follow the recommended application rate. More product doesn't necessarily mean more protection.

2. Fly Wipes and Roll-Ons

Not every horse—or horse owner—loves spraying. Wipes and roll-on products provide another way to apply fly protection, particularly around areas where flies tend to bother horses.

They're also handy for:

• The face and neck
• Legs
• Belly
• Sensitive areas where spraying may be difficult
• Horses that dislike the sound of a spray bottle

Because you're applying the product directly, wipes and roll-ons can also make it easier to target specific areas. Just remember to follow the label regarding where the product can safely be applied, especially around the eyes, nose, and mouth.

3. Fly Masks

A fly mask provides something fly spray can't: a physical barrier. Fly masks cover vulnerable areas of the horse's face and can help keep flies away from the eyes, ears, and surrounding facial area.

Some masks are simple face coverings, while others include:

• Ear protection
• Extended nose coverage
• UV protection
• Different mesh densities
• Detachable nose pieces
• More structured designs for horses that tend to rub

For horses that spend a lot of time outside, a properly fitted fly mask can be an extremely useful part of a fly-control routine.

Important: Check your horse's mask regularly for dirt, rubbing, damage, or debris and make sure it fits correctly.

4. Fly Sheets

Fly sheets take the physical-barrier concept and extend it across much more of the horse's body. A lightweight mesh fly sheet can help protect the horse's back, sides, shoulders, and other areas that are difficult to protect with topical products alone. Some fly sheets also offer UV protection, making them particularly appealing for horses that spend significant time outside during sunny weather.

Fly sheets come in many different designs, including:

• Standard fly sheets
• Full-coverage sheets
• Belly-band styles
• Neck-cover styles
• Hooded designs
• UV-protective sheets

A fly sheet doesn't have to replace fly spray. Many owners use the two together for additional protection.

5. Fly Boots and Leg Protection

Have you ever watched your horse spend an entire turnout session stomping at flies? If so, you may want to consider fly protection specifically for the legs. Fly boots, socks, and leggings create a physical barrier around the lower legs and can be particularly helpful for horses that are bothered by biting flies around their legs.

They're especially worth considering if your horse:

• Stomps constantly during turnout
• Develops irritated areas from fly bites
• Has significant fly activity around the legs
• Spends time in areas with heavy insect pressure

As with fly masks and sheets, fit matters. You want protection without creating rubbing or restricting normal movement.

6. Feed-Through Fly Control

Feed-through products work very differently from fly sprays and protective gear. Instead of trying to repel adult flies from the horse, certain feed-through products are designed to interfere with the development of fly larvae in manure. In other words, they're aimed at breaking part of the fly life cycle.

Some products contain insect growth regulators that interfere with the development of fly larvae before they become adults. This can be an appealing option for owners who want to address fly populations at their source. However, feed-through products aren't a replacement for good manure management. Extension guidance recommends combining them with practices such as regular manure removal and cleaning up spilled hay or feed. And because these products contain active ingredients, always follow the label and make sure the product is appropriate for your horse and location.

7. Fly Traps and Barn Fly Control

Sometimes the best place to fight flies isn't on the horse at all. It's in the barn. Fly traps, baits, and environmental pest-control products can help reduce the number of adult flies around stalls, barns, and other areas where horses spend time. This is particularly important because many flies aren't actually sitting on your horse. Stable flies, for example, may spend considerable time resting in the surrounding environment.

Depending on your setup, environmental control may include:

• Fly traps
• Fly baits
• Premise sprays
• Screens and netting
• Fans
• Keeping feed areas clean
• Removing manure regularly
• Removing wet or soiled bedding

Think of it as attacking the problem from the outside instead of asking your horse to carry the entire burden of fly control.

8. Natural and Alternative Fly Repellents

You'll also find a wide variety of products marketed as natural, herbal, or alternative fly repellents. These may contain ingredients such as essential oils, botanical extracts, or other plant-based ingredients. Some owners prefer these products because they want to minimize their use of conventional insecticides. However, "natural" doesn't automatically mean "risk-free" or "more effective." Horses can have sensitive skin, and some homemade or improperly formulated ingredients can cause irritation.

If you're using a commercial product, look for clear directions and appropriate labeling. EPA-registered pesticide products have undergone safety testing and carry an EPA registration number on the label.

So Which Fly Control Product Should You Use?

The answer depends on your horse.

Instead of asking, "What's the best fly spray?", consider asking:

"Where are flies bothering my horse the most?"

• If flies are bothering your horse's face:
  • Consider a fly mask, possibly with ear and nose protection.
• If your horse is constantly stomping:
  • Consider fly boots or leg protection, along with topical protection.
• If your horse is covered in flies during turnout:
  • A combination of fly spray + fly sheet + fly mask may provide more coverage than any one product alone.
• If your barn has a major fly population:
  • Focus on manure management, environmental control, traps, and possibly feed-through control rather than simply spraying your horse more often.
• If your horse has sensitive skin:
  • Look carefully at ingredients and consider discussing appropriate products with your veterinarian if your horse experiences repeated skin irritation.

The Most Effective Approach May Be a Combination

One of the biggest mistakes horse owners can make is expecting one product to solve the entire fly problem. Think of fly control as a layered approach:

Clean environment → reduce breeding areas → physical barriers → topical protection → environmental control

For example, a summer fly-control routine might look something like:

At the barn

• Remove manure regularly
• Keep feed and hay spills cleaned up
• Keep stalls and bedding as dry as possible
• Use appropriate traps or environmental controls

On the horse

• Apply fly repellent according to its label
• Use a fly mask
• Add a fly sheet when appropriate
• Use fly boots if leg-biting flies are a problem

For long-term fly management

• Consider whether a labeled feed-through product makes sense for your situation
• Continue environmental management throughout fly season

This approach is often more effective than simply reaching for the fly spray every time your horse starts stomping.

Don't Forget the Simple Stuff

Sometimes the least exciting parts of fly control are some of the most important.

Manure management matters.

Flies can develop in manure, so regularly removing manure and soiled bedding can reduce opportunities for flies to reproduce. Spilled feed and hay can also create additional breeding areas.

You don't necessarily need the biggest collection of fly-control products in the tack room.

You need the right combination of tools for your horse, your property, and your local fly pressure.

And remember: products containing pesticides or insecticides should always be used exactly according to their labels. Don't assume that a product intended for one part of the horse or barn is automatically appropriate for another use.

Build Your Horse's Fly-Control Kit

If you're putting together your fly-season supplies, a good starting point might include:

☐ Fly spray or repellent
☐ Fly mask
☐ Fly sheet
☐ Fly boots or leg protection
☐ Barn fly traps
☐ Manure-management supplies
☐ Optional feed-through fly control

You don't necessarily need every item on this list. Start with the areas where your horse is experiencing the most trouble and build from there.

Fly season is frustrating—but with a little planning, you can make it much more manageable for both you and your horse.

Ready to build your fly-control kit?
You don't need every product available. Start with the areas where your horse needs the most protection and add additional layers as needed.