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SmartPak Equine (#27055)

Fly Stoppers™

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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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You'll love our AutoShip because it's:
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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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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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Please call 1-800-461-8898 to order this product.
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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:

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*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
  • 100% Happiness Guarantee
    100% Happiness Guarantee
    At SmartPak, your happiness is at the core of everything we do. We put our products to the test in our barns and on our horses, and back every order with our world-class customer service so that you can shop with confidence. As part of our Happiness Guarantee, we promise you:
    • Expert advice from riders
    • Free shipping every day
    • Free return shipping on sized items
    • Hassle-free returns up to 365 days after purchase
(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 2.9 out of 5 by 58.
Rated 5 out of 5 by from They really work! I rarely write reviews, I just read them. But these bugs really have helped my horses. I love not seeing flies on my horses face! We haven’t used masks this year. They are rarely hatched when I get them, I leave them outside in the shade, I live in South Texas. I check each day and dump them when they are really active, usually 3-4 days later. My horses are very happy.
Date published: 2021-09-16
Rated 5 out of 5 by from They work!! These are a definite MUST to any fly reducing program. I started them in April and used disposable fly traps as well. Here is July and I have little to no flies. Horses no longer need to wear fly masks or spray!! I have 5 animals and bought the 6-10animal pack. You will not be disappointed!!!
Date published: 2021-07-23
Rated 5 out of 5 by from Miracle Worker I would like to point out these work and produce a night and day difference from having flies all over our ponies. . . to hardly being able find one on them. I know they work and people give up too quickly before seeing the effects these amazing insects can do! We keep our manure in ONE PILE, and I think this is a factor that really helps fly stoppers target where the majority of fly eggs are. Second, do NOT miss any treatments of using fly stoppers consistently, our barn uses them YEAR ROUND. Our: horses, ponies, mini horses, mini donkeys and all the other animals are happy and fly free these days thanks to fly stoppers. We will use this system for the rest of our life. If we could add another star we would!
Date published: 2021-03-07
Rated 4 out of 5 by from Less Flies I have noticed fewer flies since using fly stoppers. Will continue to use them.
Date published: 2020-08-22
Rated 5 out of 5 by from Good bye flies! We use these at the barn and this year I decided to try them at my house around the dog kennel. Has helped a lot in reducing fly populations.
Date published: 2020-07-23
Rated 5 out of 5 by from Working I am glad I added flystoppers to my fly control this year! They are working
Date published: 2020-07-12
Rated 2 out of 5 by from Was happy, but the last two shipments were duds. I have been buying these since early spring to get ahead of the fly population. I've used Arbico organics for several years, was happy to see SmartPak had a version so I gave them a try. They seemed to be doing comparable job, but I decided to go up in size just for the added protection. I have used the premium shipping right from the start, having them delivered every 3 weeks. I have received two shipments now of the double sized order, and neither have hatched. I have been using fly predators for years, so it's not a user issue, it's a product issue. Needless to say, I'm disappointed, and will be canceling this autoship and requesting a refund.
Date published: 2020-07-05
Rated 1 out of 5 by from SmartPak needs to be more forthcoming I have used a competitor's brand of wasps for a few years before SmartPak came out with their version. I switched to SmartPak, because I love the company and their products. After some time using their version, Fly Stoppers, my fly problem was never really improved. I tried doubling the amount, shipping more frequently, and then I came across a Podcast that named specific species of wasps. After digging into SmartPaks description of their Fly Stoppers, and chatting with a SP staff, they are not willing to disclose the type of wasp used in their "proprietary blend" of Fly Stoppers. This is a big red flag for me!! I am sad to say, this is the first time I have been disappointed in SmartPak. I cancelled my Fly Stoppers, and will be ordering from the competition from here on out.
Date published: 2020-06-18
Rated 4 out of 5 by from very pleased used them for the first time last year. I house three horses on my property. Two belong to me and one to a friend. I never told her I was using them because I wanted to see if she noticed a difference. we went to the vet and he brought them up and I responded " yes I am trying them this year" My friend had know clue I was using fly stoppers or even what they were but she did comment that she had noticed less flies around my property. We are definitely going to try them again this year. Now if anyone can come up with something to control the Horseflies that would be a God send
Date published: 2020-03-07
Rated 5 out of 5 by from These little bugs really make a difference! The flies were starting off horrendous this spring with all the rain we had. The horses were miserable and I was doing all I could to reduce flies and they were getting worse by day. I started the fly stoppers and within a week the flies were obviously reduced and the horses were barely swishing their tails! I went to auto delivery every three weeks and the results were amazing. I’ve done fly predators in the past from different distributors but never saw such an obvious difference as I did this season. will definitely do again next season!
Date published: 2019-09-10
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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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