Skip to content
PLEASE NOTE: You may experience errors on our site when using Internet Explorer 10 or lower. Please consider updating your browser, or download Google Chrome.
Ship speed applies to in stock items, pending location. Does not include personalized items like engraving, embroidery, SmartPaks, or PortionPaks. Complete details on our Shipping Policies page.
All of our supplement and product expertise is just a text away. Ask questions, manage your account, and place orders by texting 26756 from your mobile phone. Have a great ride!

Our experts are available
Monday – Thursday 9:00 am – 5:00 pm EST
Friday 9:00 am – 3:00 pm EST

*By texting 26756, you're giving SmartPak your consent to text you to help resolve your issue, including automated replies, at the number you provided. To opt out, text STOP to 26756. Text HELP to 26756 for info. Msg&rates may apply. Consent to receive texts not required to buy products. Terms & conditions and the full Text Message Privacy Policy can be found at https://www.smartpakequine.com/content/2waytextTC in case you're interested.
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:
Learn more about SmartPerks
*At least one individual AutoShip supplement or horse's SmartPaks must be over $40. Some exclusions apply.
Visit SmartPak.com/SmartPerks or call 1-800-461-8898 for details.

Qualifying Items

Qualifying items are eligible for free shipping, every day. Look for the badge below on the product page to confirm that your item ships free!
SmartPerks
Free Shipping

Ride Along Items

Ride Along items are eligible for free shipping when shipped with your next AutoShip order or any qualifying item. Look for the badge below to identify a Ride Along item.
Ride Along Item
Ships free with a qualifying item
Clicking on the following image links will update the image above.
Clicking on the following image links will update the image above.
colors available

Fly Stoppers™

SmartPak Equine - Item #27055
Our Price: List Price:
Our Price: Our Price: Sale Price: : $ (%) :
Member Price:
(Members save 5% at SmartPak)
:
SmartPerks Price:
(Because you have supplements on AutoShip, you save an extra 10% on this and all other SmartPak tack & apparel items!)
Your Price:
(You save 5% as a member of . And, because you have supplements on AutoShip, you save an extra 10% on this and all other SmartPak tack & apparel items!)
SmartPerks Price:
(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.)
Your Price:
(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.)
SmartPerks
Free Shipping (Details)
(Details)
Ships free with a qualifying item
Free Return Shipping
Free Return Shipping

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'!).

Customize your program:
Selecting any options will update the details accordingly with respect to the product

FINAL SALE - This item cannot be returned or exchanged.

FINAL SALE - This item cannot be returned or exchanged.

- +
Just left - order today! Don't wait - just a few left!
on every AutoShip order (Details)

days
(Discounted price will be reflected in your cart)
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
(Details)
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
Price for one-time shipment:
Find zone
How to choose
AutoShip price: Price per shipment:
AutoShip Savings applied
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
Regular Programs:
Premium Programs:
Shipment/Application Frequency
Ships every 4 weeks. For low to average fly levels, frequent manure management and few neighbors.
Ships every 3 weeks. For high fly levels or weekly manure management or nearby livestock.
Required: (Optional)
These are for:
Sign in to choose an existing
Order within and have it by
Shipping to
Est. arrival times vary,
with some as soon as
Shipping to
Order within and have it by
Shipping to
Add these items to your cart to get your estimated arrival date.
Shipping to
Please call 1-800-461-8898 to order this product.
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, but certain colors/sizes are sold out and are no longer available.

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
• Our AutoShip option means that you don’t have to worry about remembering to reorder them every month
(based on )
of customers would recommend this product to a friend!
Tell us what you think!

The reviews provided on this website represent the experience of the individual posting the review. We do not adopt, edit, or endorse any of the submissions posted within the reviews section. Rather, the reviews are part of an online community of animal owners that desire to share their particular experience with other individuals. These reviews are not a substitute for discussing the health of your animal with a veterinarian.

SmartPak customers are some of the most conscientious animal owners around. We encourage you to share your experience with the products we sell to help fellow customers to make informed choices for their animals. We do not edit these reviews in any way - they are direct customer-to-customer communication. We do monitor reviews for positive and negative feedback, and use this feedback to improve our selection as well as sharing feedback with product manufacturers to help them improve their products. Please note that we recommend consulting your vet with serious health issues.

  • Review 0
  • Votes 0
  • Discipline:
  • Expertise:
  • Product
    Experience:
  • Competitor:
Quality
Value
Palatability

Helpful?

Ingredients

(Maintenance Dose = )
Ingredient Per Serving Per Pound

Instructions

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.

Sizing

What Customers Say:

You Might Like

    Reviews

    Fly Stoppers™ is rated 2.8 out of 5 by 55.
    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
    Rated 1 out of 5 by from Terrible This is the 2nd year I’ve tried these and there’s no difference in the terrible fly population. I’ve done everything recommended including starting at the beginning of fly season, over ordering the fly stoppers, bait and traps. And as far as 100% happiness guaranteed, all I got was a oh, sorry they didn’t work for you. Total waste of money.
    Date published: 2019-09-04
    Rated 5 out of 5 by from Work well if used correctly Any negative review on these I firmly believe is because they are being used incorrectly. Please read the directions: buy for the appropriate amount of horses first of all. Second: release when they are just starting to hatch. Third: release in the areas that have the most manure. Fourth: rotate release sites. Finally: I do recommend a "double dose" at first. For example: my farm has 12 horses and we are next to another small farm with horses and livestock. I use the 10-15 horse (1.5 bags) order every 3 weeks (as recommended). Initially, I released the 1.5 bags with another 1 bag a week later as a "boost". Since then, continuing every three weeks. Our flies have been cut down to 10% of what they were before. I wish I had taken pictures. Moral of the story: do not try to cut corners. The recommendations are there for a reason. Follow the instructions and these work very very well.
    Date published: 2019-09-01
    Rated 5 out of 5 by from funny story It was a great product but I would say warning not to let the package sit in the garage for several weeks under extreme heat would have worked wonders. They ended up hatching before I wanted them to but I don't have any flies in my garage or house now. i'll be more careful next time but great product.
    Date published: 2019-08-19
    • y_2020, m_11, d_29, h_16
    • bvseo_bulk, prod_bvrr, vn_bulk_3.0.12
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_55
    • loc_en_US, sid_17055, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_smartpak
    • bvseo_sdk, net_sdk, 3.2.0.0
    • CLOUD, getContent, 79ms
    • REVIEWS, PRODUCT

    Q & A