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Fly Stoppers
SmartPak Equine (#27055)

Fly Stoppers™

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(You save 5% as a member of . Because you have supplements on AutoShip, you can save an extra 10% on this and all other SmartPak tack & apparel items! Enter promo code PERKS at checkout.)
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As riders and online shoppers, we know it can be tough to buy a new bridle or pair of boots without trying them on. That's why we moved the fitting room to your living room (or barn)! From breeches to blankets, if you or your horse can try it on, you can return it, free! Just request a return with a FREE SmartPak return label from your Order History within 60 days of the purchase date. And of course, please make sure the item is in like-new condition with original packaging (we said 'fitting room', not 'war room'!).

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FINAL SALE - This item cannot be returned or exchanged.

FINAL SALE - This item cannot be returned or exchanged.

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You'll love our AutoShip because it's:
  • Focused on happy riders - never worry about running out!
  • Easy to snooze or cancel online, anytime
  • Totally flexible - edit your order as often as you'd like
PLUS! You'll save % on every shipment if you order this product on AutoShip
You'll love our AutoShip because it's:
  • Focused on healthy s, because consistency is key
  • Easy to snooze or cancel online, anytime
  • Totally flexible - edit your order as often as you'd like
  • Your VIP pass to FREE SmartPerks benefits
PLUS! You'll save % on every shipment if you order this product on AutoShip
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Start date: Customize your program for estimated start date. View estimated schedule
Zone Map
Begin with the zone for the state you are in. Dates shown on the map indicate suggested start and end dates for Fly Stoppers™ shipments. You may want to shift a zone if your elevation or microclimate is unusual, or if you fall on the border between two zones. You can start anytime during the fly season. Choose "Year Round" for climates that have flies all year, and start now.
Program Type Shipment/Application Frequency
Regular Programs: Ships every 4 weeks. For low to average fly levels, frequent manure management and few neighbors.
Premium Programs: Ships every 3 weeks. For high fly levels or weekly manure management or nearby livestock.
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Before purchasing this item, please note:

  1. This item can't be shipped to a PO Box.
  2. This product will be shipped directly from the manufacturer using a shipping company.
  3. The freight company will call you to schedule a delivery appointment.
  4. If SmartPak and the shipper are unable to contact you within 7 business days of the product shipping out, your order will be cancelled.
  5. You may be liable for any storage fees due to missed delivery appointments or requests for dates beyond the standard delivery window.
  6. When your shipment arrives, you will be responsible for inspecting the shipment to make sure it's complete and that no items are damaged.
  7. Before accepting the shipment and signing for it, you must record missing items and damaged items on the receipt, and take pictures of any damage.
  8. SmartPak and the manufacturer will not be able to assist you in filing a claim if you haven't noted any damage on the receipt. You will be responsible for filing any claims.

Shipping is not available to Alaska or Hawaii for this item. We apologize for any inconvenience.
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All customized items are personalized in our Plymouth, MA facility, and it looks like this item is currently out of stock in that location.
Please call 1-800-461-8898 to order this product.
Lowest Price Guaranteed
We're bringing you this product at the lowest price allowed by the manufacturer so you won't find it cheaper anywhere else. This also means we can't apply any further discounts or promotions.
We're sorry this item is currently out of stock. Our team is working to get it back in stock asap.

SmartPerks Putting your horse's supplements on AutoShip helps you take great care of your horse, so we take great care of you with SmartPerks! When you order your horse's supplements on AutoShip, you're automatically* eligible for our FREE SmartPerks benefits, including:

  • Free shipping every day
  • 10% off all SmartPak brand tack, apparel, and gear

Learn more about SmartPerks

*At least one individual AutoShip supplement or horse's SmartPaks must be over $40. Some exclusions apply. Visit or call 1-800-461-8898 for details.


Why We Love This

Fly Stoppers™ are the smart way to make your farm a no-fly zone! These tiny, beneficial bugs stop adult pest flies from developing by feeding upon and breeding within the developing (pupal) stages of manure breeding flies.

Fly Stoppers™ work by seeking out their target host – the fly pupae – and depositing their eggs inside them. These eggs then hatch and begin to grow and feed on the developing fly, thus stopping the adult pest fly from hatching. Once mature, the Fly Stoppers emerge from the fly pupae to look for a mate and the female Fly Stoppers™ continue to lay eggs in fly pupaes.

While Fly Stoppers™ reproduce in approximately three weeks to replenish the beneficial insect population, pest flies do reproduce at a faster rate than Fly Stoppers. That’s why Fly Stoppers must be reintroduced to your property on a regular basis. We recommend releasing a shipment of Fly Stoppers™ every three to four weeks throughout fly season for maximum results. If you order them on AutoShip, you’ll save 5% on every shipment and you won’t have to remember to reorder every month!

Please note: Hatching can take up to 10 days, and Fly Stoppers like to be warm and cozy before they hatch. Wrapping them in a pillow case and storing on top of a fridge or hot water heater can help!
Favorite Features:
  • Beneficial insects stop pest flies from developing, helping to control the fly population at your farm
  • They're a chemical-free solution you can feel good about using
  • You'll prevent flies from developing before they can bother your horse
  • Spend just five minutes releasing them each month and enjoy a fly-free farm all summer
  • Put them on AutoShip ad you'll stop stressing about your fly control program and save 5% on every shipment
(Maintenance Dose = )
Ingredient Amount
Instructions for Use:
  • Fly Stoppers are shipped via US Mail as parasitized fly pupae in wood shavings.
  • When received, check for evidence of hatching.
  • Once a few have hatched, simply disperse small handfuls or scoops around your property into "hot spot" breeding areas, such near manure piles, under water troughs, below bedding, the corners of pens and paddocks, and feeding sites.
  • Cover with dirt to protect pupaes.
  • If you do not see movement within the bag, you can speed up the process by placing the bag in an old pillowcase and setting it on top of your hot water heater or refrigerator. Make sure you check them every day for fly parasite activity.
  • It may take up to 14 days for hatching to occur at various time during the fly season.
  • You can release the Fly Stoppers before they hatch; however, they must be covered with a thin layer of manure or ground cover to prevent birds and ants from consuming the unhatched fly parasites.
What Customers Say:
Fly Stoppers™ is rated 3.1 out of 5 by 37.
Rated 1 out of 5 by from Really wanted them to work! Can’t tell they are helping at all. First bag never hatched second hatched and they all escaped the bag and were all over my house. Third bag seems to be in a lot of spider webs (that I knock down daily).
Date published: 2023-06-23
Rated 1 out of 5 by from Not Consistent Hatchers I started using these last year (2022) and they seemed to help. However, come August, the bag I received never hatched. SmartPak was helpful and offered a replacement. Sadly, the replacement never hatched either. Throughout the rest of fly season, it was hit or miss whether the bag I received hatched. So far this spring I have received two bags - both have not hatched. When I tried to request a refund this time I got an error message. I canceled my subscription and will try fly predators.
Date published: 2023-06-06
Rated 5 out of 5 by from Working so far! They seem to be working so far! The bugs are very tiny, might be a little hard to see when they start hatching. SmartPak is great to work with. Thank you!
Date published: 2023-06-05
Rated 1 out of 5 by from I'm sure they would be great if they hatched They did not hatch unfortunately. Maybe it was a defective couple bags.
Date published: 2023-05-12
Rated 5 out of 5 by from Huge difference! I rarely take the time to leave a review, but the Fly Stoppers are worth my time. In the summer of 2021, the flies in my barn were horrible. So, I decided to that I didn't have anything to loose and decided to try the Fly Stoppers in 2022. There were flies, you could never eradicate them all, but they were not the nuance that there were the previous year. In 2021 we would have the whole ceilings covered in flies, this never happened in 2022 with the Fly Stoppers. Follow the instructions and use them as directed and you will have good results. I highly recommend them and are ordering them again this year!
Date published: 2023-02-21
Rated 2 out of 5 by from Hit or miss I received 4 shipments and was so excited after the first one. The flies really seemed to be well controlled. Every subsequent order (3 of them!) failed to hatch or had very little activity compared to the first order. The flies came back full swing. I followed the directions on the packaging and it just didn't work out for me.
Date published: 2022-08-27
Rated 3 out of 5 by from Inconsistent Quality I've gotten these delivered a few times now. The first batch was great. The second, they arrived as normal but then all hatched and died in a day. I looked at them in the morning, there was a little bit of activity and I planned to release them when it got a little warmer. When I looked again, they were all dead.
Date published: 2022-08-16
Rated 1 out of 5 by from Not as good as fly predators Was hoping these would work as the fly predators did. Didn’t help at all, in fact, most of them never even hatched.
Date published: 2022-08-07
Rated 5 out of 5 by from The best fly control for barns Fly predators work and are affordable at the price point they are at now. Very happy with this product. Highly recommend them.
Date published: 2022-06-16
Rated 1 out of 5 by from Not impressed This is the second year I’ve bought these and I’m not seeing any difference in fly population. Our paddocks are cleaned twice daily, manure is removed from the property all together on a regular basis and the flys are horrendous. The last two shipments I received were already hatched as well and when I opened the shipping envelope they were all over inside that. I love smart pak but I’ll be cancelling my subscription.
Date published: 2022-06-07
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Q & A
How to use Fly Stoppers™
SmartPaker Emily shows you how easy Fly Stoppers are to spread and gives you some tips and tricks so you can get the most out of these bugs!

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