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Farnam Companies, Inc. — Item #12587
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Breaks the fly life cycle

  • Prevents the formation of fly larvae's exoskeletons when they molt (resulting in their death)
  • Contains no organophosphates & can be used as part of an integrated pest management program
SimpliFly with LarvaStop is a highly palatable additive to prevent the development of stable flies and house flies in the manure of treated horses. LarvaStop breaks the fly life cycle by preventing the formation of fly larvae's exoskeletons when they molt (resulting in their death).

SimpliFly contains no organophosphates and can be used as part of an integrated pest management program. SimpliFly with LarvaStop is a reduced-risk pesticide.

View our Insect Control Supplement Comparison Chart


Active Ingredients:
  • Diflubenzuron (Dimilin)
Inactive Ingredients:: Wheat Middlings, Dehydrated Alfalfa Meal; Calcium Carbonate; Sodium Chloride; Calcium Propionate (preservative)


Instructions for Use:
Feed the recommended dosage of SimpliFly to each horse separately to make certain he receives his full portion. This product should be fed top dressed on grain or mixed with the horse's total ration to provide 6.8mg of diflubenzuron per 100lbs of body weight. For an occasional finicky eater who does not accept new feeds readily, mix this product with sweet feed or grain ration.

Daily Dosage
300 - 500lbs : feed 2/5 oz. per horse per day
500 - 700lbs : feed 3/5 oz per horse per day
700 - 900lbs : feed 4/5 oz per horse per day
900 - 1100lbs : feed 1 oz per horse per day
1100 - 1300lb horse : feed 1 1/5oz per horse per day.
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    out of 5
    89% 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.

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    SimpliFly is rated 4.5 out of 5 by 195.
    Rated 5 out of 5 by from So far, so good I've only been giving my horses Simplifly for about 2 months, but it appears to be working well. It's not the only tool I use for managing the flies around my barn but but it's definitely an important part of the overall regimen.
    Date published: 2016-06-21
    Rated 4 out of 5 by from Works Great! Just be patient. I started my horses on this after the flies were already taking over, so it took about six weeks to show it was working. But now my manure piles don't have any baby flies, and there aren't any maggots under the piles. There are still some adult flies around, but they are just the normal population that would be here even without any animals. The only reason I didn't give 5 stars is because it does take a long time to affect in the fly population, and it seems a bit expensive.
    Date published: 2016-06-20
    Rated 5 out of 5 by from Great product. Really works Super satisfied with this feed through. It works great. Keeps fly population down and all the horses are it great.
    Date published: 2016-06-13
    Rated 5 out of 5 by from Effective We use this during the summer months in TX to control the ubiquitous flies, which it does well. We feed it daily to our 2-3 horses, and have very few flies. I also use metered spray units (Country Vet), Farnum spot-on product, and Tri-Tec spray-on. Our neighbor uses a similar product on his cattle -- taken together, our barn in unusually comfortable in the summer. The horses eat it readily, and have had no health complications. It's a little costly, but worth it for our operation.
    Date published: 2016-05-30
    Rated 4 out of 5 by from So far, so good! I just purchased Simplify last month because last summer the flies were insane! Nothing I used seemed to work. My two horses were covered with nasty biting flies. I would love to give this five stars, but it's only been a month and the height of fly season is yet to come, but I am very hopeful. It seems like there are less flies so far but time will tell. At least my horses have no problem eating it with their regular grain so I will continue to use it through out the summer.
    Date published: 2016-05-25
    Rated 5 out of 5 by from Good name for product. I started with this product last year. I am really pleased how it really repels flies, especially mosquitoes and biting flies.
    Date published: 2016-05-11
    Rated 4 out of 5 by from Fly Prevention Seems to be keeping flys down. Will have to see if there is a great reduction this summer.
    Date published: 2016-05-08
    Rated 4 out of 5 by from Great product I've been using this product for 1 month and so far I haven't seen any flies in my barn or stalls. I'm interested to see how well it works in the hotter summer months.
    Date published: 2016-05-05
    Rated 1 out of 5 by from expensive and little benefit I have my own 18 acre farm very high and dry. I have been using this product for over a month on my own 3 horses. This product may have minimally reduced the flies but not as much as I had hoped.
    Date published: 2016-04-09
    Rated 4 out of 5 by from Help reduce fly population! Only have two horses at my farm so feed through really helps control the vector fly population! Love that product is available in a SmartPak!
    Date published: 2016-01-02
    Rated 5 out of 5 by from No flies in my barn! Love this stuff! I don't have to fight all the flies that the people without this in their horse's feed have too! It seems to cut down on even the nats that had been bad in and around my barn. Very palatable and my picky eaters don't even flinch to clean it up with their feed
    Date published: 2015-11-17
    Rated 5 out of 5 by from Safe for my horse My horse can't take the "spot-on fly control, it seems to make her sick. She does just fine with the "SimpliFly" feed-thru product, which I feed with her SmartTranquility and SmartGut pellets.
    Date published: 2015-11-07
    Rated 4 out of 5 by from Works pretty well This does help with overall fly population. It is not as good as Solitude, but it isn't as pricey.
    Date published: 2015-10-30
    Rated 5 out of 5 by from Works Great!!! Took about 3 weeks, and then suddenly the fly population dropped in less than half!!!
    Date published: 2015-10-20
    Rated 5 out of 5 by from I start feeding this in March (before flies start) and feed through Oct or Nov till a good hard frost, it is great. People walk in the barn and will comment on no flies. I wish I could afford it for all pasture horses too.
    Date published: 2015-09-27
    Rated 5 out of 5 by from Bye, bye flies! The horses love the taste and it really seems to lessen the flies in the barn and bothering the horses.
    Date published: 2015-09-26
    Rated 2 out of 5 by from Maybe next year. I have only been using this for a month to replace Fly Predators, which didn't work at all this year. I haven't noticed any improvement in this short time. Will update next year and start using earlier. Both horse seem to love the taste
    Date published: 2015-09-18
    Rated 5 out of 5 by from Great Product! I couple months ago I bought my own small farm. There were 2 horses on the property when I bought it and when I moved my horses there a month later. The flies were TERRIBLE!!! We had previously been at a farm with more than 100 horses and didn't have this kind of fly problem. I put both my horses on this product and within a month there was a drastic reduction in the fly population. I am extremely happy with this product!
    Date published: 2015-08-25
    Rated 4 out of 5 by from Good addition to Fly Predators I use this product in addition to fly predators and it works for our barn. I like the fact that I don't have to put out predators every month and can skip 1 month in between. My horses don't mind eating it mixed in with their grain.
    Date published: 2015-08-12
    Rated 4 out of 5 by from good product The flies are minimal! Late summer usually brings the biting flies, but adding this product to my horses diet has reduced the flies enormously. Recommended!
    Date published: 2015-08-04
    Rated 5 out of 5 by from Definitely Fewer Flies I have used SimpliFly for several years now and it is an intregral part of my insect repellent program. It works! I start it in the spring before flies arrive and keep it until late fall.
    Date published: 2015-08-04
    Rated 4 out of 5 by from helps work to get rid of the flys I am on my second tub, I would start this earlier next year though. I does take about 10 days for it to really start working. But I do notice a huge difference with it.
    Date published: 2015-07-25
    Rated 4 out of 5 by from Late start, but a difference! I have not been feeding this quite a month, I got a late start with it. The biting flies in NE Oklahoma are HORRIBLE this year because of all the rain and it seems that my usual fly population is down a bit.
    Date published: 2015-07-10
    Rated 5 out of 5 by from easy to use I have used this product for many years and it works but you need to start using it early in the spring.
    Date published: 2015-06-18
    Rated 4 out of 5 by from Very helpful It's been a weird year, but there are definitely far fewer flies than usual. The barn is not full of them, and the horses don't seem too bothered. We don't have huge amounts of space, so we still get flies from neighbors, but it is still a noticeable difference from last year. It would be nice if it had a repellent effect, but I'm still very happy. The only thing that is somewhat annoying is the measuring scoop I got with the bucket is for left-handed people! Only one side is marked with the measurements, and I can only see them if I'm holding it in my left hand.
    Date published: 2015-06-02
    Rated 5 out of 5 by from So far so goo I recently started my horses in this feed through fly system a month ago, haven't noticed any direct results yet as they need to be on 60 days but hoping for the best!
    Date published: 2015-06-01
    Rated 5 out of 5 by from seems to work well for us we used this last year and had very little fly problems. This year with all the wet the flys are bad for every one. But our barn seems to have very few.
    Date published: 2015-05-29
    Rated 4 out of 5 by from works great This is the second summer I have used this product. It doesn't get rid of all of the flies but it sure does help a bunch
    Date published: 2015-05-26
    Rated 5 out of 5 by from Amazing! NO Flies on the poop in the stalls I never believed it until I tried it. There are 6 horses on it at my farm and there are no flies on anyones poop in the stalls and out in the pasture. I do have goats and the neighbor has cows, so there are some out in the fields, but nothing like last year. I started using it in April and will continue until fall. Great stuff. I am impressed!
    Date published: 2015-05-25
    Rated 5 out of 5 by from Noticed results quickly I bought one of these as I was having morning flies then usual in my barn this Spring. Within a week I noticed that the number of flies was less. Horses didn't mind eating it - just mixed with their grain.
    Date published: 2015-05-19
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