Best Fly Spray System for Barn: 10 Misting Kits, Dispensers and Refills Compared

You muck the stalls, wipe the water buckets and the flies are back by lunch. Hand spraying works for an hour. A barn that holds horses, hay and manure draws flies every single day, so the real fix is a system that sprays for you.

A fly spray system is not one product. It is a tank, tubing and nozzles, or a timed dispenser, plus a concentrate that goes inside. The Pynamite 10 Gallon Misting System is a complete misting system with a phone app. The MCS 55 Gallon Gold Misting System is a 55 gallon kit for big barns. The Country Vet Flying InsectKill System is a timed dispenser for one stall.

We compared 10 options by type, size, nozzles and refill, using only listing details. Read each label closely, since barn sprays are insecticides that need careful use around horses, other animals and feed.

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On this page

1. Compare Barn Fly Spray Systems by Type, Size and Control
2. Detailed Reviews: Best Fly Spray System for Barn
3. Do Not Buy a Refill Without the System It Fits
4. Read the Label for Animals, Feed and Water
5. How to Choose a Barn Fly Spray System
6. Which Fly Spray System Should You Choose?
7. Frequently Asked Questions
8. Final Verdict

Compare Barn Fly Spray Systems by Type, Size and Control

Detailed Reviews: Best Fly Spray System for Barn

1. 10 Gallon Mosquito Misting System Pynamite Wi-Fi/Bluetooth app and 10 Nozzle Kit (Best complete system for a smaller barn)

• 10 galTank
• 10Nozzles
• 10 ftNozzle spacing
• AppController

Best for: a small to mid-size barn where you want a full kit and phone control

Why it ranks #1: It is the only complete system here that the listing says to place in stalls and down the center aisle of a barn.

Pynamite lists a smaller misting system for yards, boat docks and barns that works on mosquitoes, flies, spiders and no-see-ums. The 10 nozzle kit has nickel plated brass 45 degree nozzles, and the listing says to place nozzles 10 ft apart around the area, in the stalls and down the center aisle of a barn.

It includes a Wi-Fi and Bluetooth controller with a free phone app, a pump with jet agitation and a strainer to keep nozzles clear. The listing says the misting concentrate works on many nuisance insects. Read the concentrate label for use around animals.

Skip it if you need coverage for a big barn; the MCS 55 Gallon Gold Misting System has a 55 gallon tank and 30 nozzles.

2. MCS Products 55 Gallon Gold Insect Misting System Kit for Mosquitos, Flies, Pests, Barns, Farms, Stables (Best large-barn misting kit)

• 55 galTank
• 30Nozzles
• 500 ftTubing
• 80 to 90%Listed reduction

Best for: larger barns and stables that need many nozzles

Why it ranks #2: It is the biggest kit here, with push-fit fittings and a listed reduction in flying insects.

MCS lists a kit with a 500 ft roll of 1/4 in nylon tubing, 30 slimline misting nozzles in stainless steel, 30 T adapters and push to connect unions and elbows. No tools are required because all fittings push together.

The listing says it gives an 80 to 90 percent reduction of flying insects including mosquitoes, flies, gnats and no-see-ums. The listing names barns, farms and stables. Read the product label for the concentrate to use.

Skip it if you have a small barn; the Pynamite 10 Gallon Misting System is a 10 gallon system.

3. Waterbury Country Vet Flying InsectKill System, 24 Hour Control, Dispenser Every 15 Minutes (Best metered dispenser for one area)

• 15 minSpray interval
• 24 hrRuns
• 1Canister
• SleekDispenser

Best for: a stall, tack room or small aisle without plumbing

Why it ranks #3: It needs no tank or tubing, just a canister, but it covers one spot.

Waterbury lists a metered dispenser that activates a valve every 15 minutes, 24 hours a day. It comes with one fly spray canister and the listing says it kills gnats and small flying moths.

The listing does not give a coverage area or the active ingredient, so check the canister label.

Skip it if you want to cover a whole barn; the MCS 55 Gallon Gold Misting System covers many nozzles.

4. AMREP 074026 2 Piece Country Vet Equine Mosquito/Flying Insect Control Kit (Best starter kit for a stall)

• 6.9 ozCan
• 2Pieces
• AutomaticDispenser
• EquineUse

Best for: a single stall or a small barn where you want an easy start

Why it ranks #4: It is a small starter kit with one can and a dispenser.

The listing says this kit has one 6.9 ounce can of maximum strength mosquito and fly spray and one automatic dispenser. It names barn stall and stable automatic flying insect control.

The listing says it kills and repels flying insects including mosquitoes. It does not give a spray interval or area, so check the packaging.

Skip it if you want a stated spray interval; the Country Vet Flying InsectKill System lists 15 minutes.

5. PYRANHA 1-10 HP Concentrate Refill 2.5 Gallon for 55 Gal Automatic Spray Systems (Best refill for 55 gallon systems)

• 2.5 galSize
• 55 galSystem size
• PyrethroidsActive type
• 50 yearsBrand claim

Best for: refilling a 55 gallon automatic spray system

Why it ranks #5: It kills and repels many biting flies, but it is a refill, not a system.

Pyranha lists a 1-10 HP concentrate made with pyrethroids for 55 gallon automatic spray systems. The listing says it kills and repels horn flies, deer flies, stable flies, horse flies, face flies, mosquitoes and midges.

The listing says it was developed over 50 years. You mix it per the label for your system, and the label tells you which animals and areas it is for.

Skip it if you have a 30 gallon system; the PYRANHA 1-10 HPS 2.5 Gal Refill (30 Gal Systems) is made for that size.

6. PYRANHA 1-10 HPS Concentrate Refill 2.5 Gallon for 30 Gal Automatic Spray Systems (Best refill for 30 gallon systems)

• 2.5 galSize
• 30 galSystem size
• PyrethroidsActive type
• HPSVersion

Best for: refilling a 30 gallon automatic spray system

Why it ranks #6: It is the same idea as the PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems) but made for a 30 gallon system.

Pyranha lists a 1-10 HPS concentrate with pyrethroids for 30 gallon automatic spray systems. The listing says it kills and repels horn flies, deer flies, stable flies, horse flies, face flies, mosquitoes and midges.

It is a refill only, so you need a system to use it. Read the label for mixing and for use around animals.

Skip it if you have a 55 gallon system; the PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems) is made for that size.

7. PYRANHA Bug Armor Zero-Bite Concentrate Refill for Automatic Spray Systems (Best essential oil refill)

• 1 galSize
• GeraniolActive type
• 55 galSuits
• NaturalListed

Best for: barns where you prefer an essential oil product

Why it ranks #7: It uses essential oils instead of pyrethroids, so check what it controls.

Pyranha lists a concentrate with essential oils including geraniol that is used in misting systems such as the 55 gallon SprayMaster. The listing says it helps manage flies, fleas, ants and mosquitoes.

The listing calls it a safe alternative to harsh compounds when applied as directed. It is a refill, so read the label for mixing and animals.

Skip it if you want a broader list of biting flies; the PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems) lists several.

8. Bonide Revenge Barn and Stable Fly Spray, 32 oz Concentrate (Best concentrate for premises and animals)

• 32 ozSize
• 13.3%Permethrin
• Indoor/outdoorUse
• Livestock and dogsAnimals

Best for: spraying barn surfaces and animals by hand

Why it ranks #8: It works as a hand spray for both surfaces and several animals, but the label rules apply.

Bonide lists a concentrate with 13.3 percent permethrin for premise and on-animal fly spray. It names horses, beef and dairy cattle, goats, sheep, swine, poultry and dogs, and says it is for indoor and outdoor use around the farm.

It controls flies, spiders, fleas, ticks and more. Mix and apply per the label, and note which animals the label allows.

Skip it if you want an automatic setup; the Pynamite 10 Gallon Misting System and MCS 55 Gallon Gold Misting System are systems.

9. BONIDE Revenge Barn and Stable Fly Spray Ready to Use, 1.33 Gallon (Best ready-to-use spray for livestock)

• 1.33 galSize
• 4 weeksWorks up to
• PumpSprayer
• RefillableBottle

Best for: spraying livestock without mixing

Why it ranks #9: It needs no mixing and lists up to 4 weeks of protection.

The listing says to spray it directly on livestock and that it protects horses, beef and dairy cattle, goats, sheep and swine from horse flies, stable flies and face flies. It works for up to 4 weeks.

It is ready to use with a pump and spray bottle that is refillable. Keep it out of reach of children.

Skip it if you want an automatic system; the Pynamite 10 Gallon Misting System is one.

10. Insect Misting System Parts Kit 1/4 in Compatible for Mosquitos, Flies, Barns, Stables (Best add-on parts kit)

• 100 ftTubing
• 10Nozzles
• 1/4 inSize
• Push to fitFittings

Best for: extending or repairing a compatible 1/4 in misting system

Why it ranks #10: It is parts only, not a system, and works only with compatible 1/4 in low pressure kits.

MCS lists a parts kit with 100 ft of 1/4 in nylon tubing, 10 slimline stainless steel nozzles, push to connect unions, tees, an elbow, a tubing cutter and screws. Fittings push together with no glue or tools.

The listing says it is compatible with 1/4 in low pressure insect misting kits. It has no tank or pump.

Skip it if you need a full system; the MCS 55 Gallon Gold Misting System includes one.

Do Not Buy a Refill Without the System It Fits

Many listings here are refills or parts, not systems. The PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems) is a concentrate for 55 gallon systems and the PYRANHA 1-10 HPS 2.5 Gal Refill (30 Gal Systems) is for 30 gallon ones. The MCS Misting Parts Kit 1/4 in is parts only. These do nothing alone.

Start with the system: a misting kit like the Pynamite 10 Gallon Misting System or MCS 55 Gallon Gold Misting System, or a timed dispenser like the Country Vet Flying InsectKill System. Then buy the concentrate or canister it calls for. Make sure the refill matches your tank size.

Read the Label for Animals, Feed and Water

Barn insecticides are chemicals. Some products use pyrethroids, like the PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems), and others use essential oils, like the PYRANHA Bug Armor Zero-Bite Concentrate. Labels say which animals the product is for, how much to mix and when animals and people should stay away.

Keep nozzles away from feed, water buckets and open hay where the label says to, and think about cats, birds and fish that share the space. Check state rules for livestock or food animals. A system does not replace cleaning: remove manure, wet bedding and spilled feed where flies breed.

How to Choose a Barn Fly Spray System

Barn size

For a small barn, the Pynamite 10 Gallon Misting System lists 10 nozzles and a 10 gallon tank. For a large barn, the MCS 55 Gallon Gold Misting System lists 30 nozzles and a 55 gallon tank. For one stall, the Country Vet Flying InsectKill System or Country Vet Equine Flying Insect Kit works.

Control

The Pynamite 10 Gallon Misting System has a phone app. The Country Vet Flying InsectKill System sprays every 15 minutes, all day. Hand sprays like the Bonide Revenge Barn and Stable 32 oz Concentrate and Bonide Revenge Barn and Stable RTU 1.33 Gal are manual.

Concentrate type

Pyrethroid refills like the PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems) list several biting flies. The PYRANHA Bug Armor Zero-Bite Concentrate uses essential oils.

Related reading

If mosquitoes are also a problem, see our best mosquito pesticide for yard guide.

Which Fly Spray System Should You Choose?

• If you want a full system for a small barn, choose the Pynamite 10 Gallon Misting System, because it lists stalls and aisle placement.
• If you have a large barn, choose the MCS 55 Gallon Gold Misting System, because it has 30 nozzles and 500 ft of tubing.
• If you want a dispenser for one area, choose the Country Vet Flying InsectKill System, because it sprays every 15 minutes.
• If you want a starter kit for a stall, choose the Country Vet Equine Flying Insect Kit, because it includes a can and a dispenser.
• If you run a 55 gallon system, choose the PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems), because it is made for that size.
• If you run a 30 gallon system, choose the PYRANHA 1-10 HPS 2.5 Gal Refill (30 Gal Systems), because it is made for that size.
• If you prefer essential oils, choose the PYRANHA Bug Armor Zero-Bite Concentrate, because it uses geraniol.
• If you want a hand spray concentrate, choose the Bonide Revenge Barn and Stable 32 oz Concentrate, because it works on premises and animals.
• If you want ready-to-use spray, choose the Bonide Revenge Barn and Stable RTU 1.33 Gal, because it needs no mixing.
• If you are expanding a system, choose the MCS Misting Parts Kit 1/4 in, because it adds tubing and nozzles.

Frequently Asked Questions

What is the best fly spray system for a barn?

For a small barn, the Pynamite 10 Gallon Misting System is the best complete system here, with 10 nozzles and app control. For a large barn, the MCS 55 Gallon Gold Misting System lists 30 nozzles and a 55 gallon tank.

Are automatic fly sprayers worth it?

They save daily hand spraying. Systems like the Pynamite 10 Gallon Misting System and dispensers like the Country Vet Flying InsectKill System run on a schedule, but you still need to clean the barn and refill concentrate.

How many nozzles do I need?

The Pynamite 10 Gallon Misting System listing says to place nozzles 10 ft apart in the stalls and down the aisle. Divide your aisle and stall length by 10 ft to estimate.

Are essential oil fly sprays as strong as pyrethroids?

Listings differ. The PYRANHA 1-10 HP 2.5 Gal Refill (55 Gal Systems) lists many biting flies, while the PYRANHA Bug Armor Zero-Bite Concentrate lists flies, fleas, ants and mosquitoes. Check the label for what each controls.

Can I spray my horses with barn spray?

Only if the label allows it. The Bonide Revenge Barn and Stable 32 oz Concentrate and Bonide Revenge Barn and Stable RTU 1.33 Gal list on-animal use for several animals. Never use a premise spray on animals unless it says so.

How often do I need to refill?

It depends on tank size, nozzle count and timer. A 55 gallon kit like the MCS 55 Gallon Gold Misting System lasts longer between fills than a 10 gallon tank like the Pynamite 10 Gallon Misting System. Check the label for mix rates.

Final Verdict

The Pynamite 10 Gallon Misting System is the best fly spray system for a barn in this guide for smaller barns. It lists 10 nozzles, a 10 gallon tank, app control and a placement guide for stalls and the center aisle. For larger barns, the MCS 55 Gallon Gold Misting System has 30 nozzles and a 55 gallon tank. Before you buy, measure your aisle and read the concentrate label for use around animals.

See the Pynamite 10 Gallon Misting System on Amazon