Fly sprays and repellents help keep flies, midges and other biting insects off your horse. They split into stronger synthetic repellents (often containing DEET, for long-lasting protection), gentler natural and citronella formulas, and targeted gels, creams and roll-ons for the face and sensitive areas. Just Horse Riders stocks them from brands including NAF, Carr & Day & Martin, Barrier, Leovet and Gold Label, from around £5.

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Fly-season advice from the Just Horse Riders team — last reviewed June 2026.

In a hurry? For long-lasting protection on a hard day choose a DEET-based repellent; for sensitive horses or daily use a natural or citronella formula is gentler. Use a roll-on or gel around the face and ears, where a spray is not ideal.

Which fly repellent do I need?

Type	Best for
DEET-based	Strong, long-lasting protection for busy yards and hard days
Natural / citronella	Sensitive horses and everyday use — gentler, top up more often
Gel / cream	Targeted protection for the face, ears and sore spots
Roll-on	Mess-free application around the eyes and muzzle

How do I apply fly spray?

Spray onto a clean, dry coat from a short distance and smooth it in, avoiding the eyes; use a sponge or roll-on for the face. Reapply as directed — strong repellents last longer, while natural ones usually need topping up more often, especially after rain or sweating. Always patch-test a new product first.

What is the strongest horse fly repellent?

DEET-based sprays such as NAF Off Deet Power and Flygard Extra Strength are among the longest-lasting. For midges and sweet-itch-prone horses, pair a repellent with a fly rug for a physical barrier.

The best fly sprays & repellents

Best all-round: Carr & Day & Martin Flygard Extra Strength (from £14.13).
Strongest / longest-lasting: NAF Off Deet Power (from £17.20).
Best natural: Barrier Super Plus Fly Repellent (from £12.82) or Global Herbs FlyFree (from £16.91).
Best value citronella: Gold Label Citronella Compound (from £6.27).

Frequently asked questions

How long does horse fly spray last?

It varies by formula: DEET-based repellents typically last longest, while natural and citronella sprays usually need topping up more often, especially after rain or sweating. Always follow the label directions.

What is the best natural fly spray for horses?

Citronella and plant-based repellents such as Barrier or Global Herbs are popular gentler options for sensitive horses. They work well but generally need more frequent reapplication than DEET formulas.

Can I use fly spray on my horse's face?

Do not spray directly near the eyes. Apply a roll-on or gel, or spray a little onto a sponge and wipe it carefully around the face and ears — or use a fly mask to protect the eyes.

Does fly spray help with sweet itch?

A repellent helps deter the midges that trigger sweet itch, but the most reliable protection is a full-coverage barrier rug. Use the two together for sweet-itch-prone horses.

Not sure which repellent suits your horse? Tap the WhatsApp button at the bottom of the screen and one of the team will help.

Stableline Citronella Spray