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Farnam SimpliFly Feed-Thru Fly Control

Farnam Companies, Inc.


Get a jump start on fly control by starting your horse on SimpliFly ® Feed-Thru Fly Control with LarvaStop - which prohibits flies from developing into mature adults - early in the spring and continue throughout the summer until cold weather restricts fly activity.

Key Benefits

  • Preventative treatment: Prevents the development of house and stable flies in manure when horses are continually treated.
  • Palatable formula: Supplement is highlypalatable; just add to horse's feed
  • Contains no organophosphates
  • EPA-Approved: Only equine feed-thru fly control granted reduced-risk pesticide status by the EPA
  • Contains Diflubenzuron

Directions For Use

Feed the recommended dosage of Farnam ® SimpliFly ® Feed-Thru Fly Control 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 6.8 mg of diflubenzuron per 100 lbs. of body weight. For an occasional finicky eater who does not accept new feeds readily, mix this product with sweet feed or grain ration.

Start feeding Farnam ® SimpliFly ® Feed-Thru Fly Control early in the spring before flies begin to appear and continue feeding throughout the summer and into the fall until cold weather restricts fly activity. This product contains an insect growth regulator which prevents the development of house flies and stable flies in the manure of treated horses, but is not effective against existing adult flies.

In some cases, supplemental fly control measures may be needed in and around paddocks and buildings to control adult house and stable flies which can breed in other decaying vegetable matter or silage on-premises, or that migrate in from other areas.


300-500 lb. Horse, Pony or Miniature Horse Feed 2/5 oz. per horse per day.

500-700 lb. Horse or Pony Feed 3/5 oz. per horse per day.
(One measuring cup filled to the red line.)

700-900 lb. Horse Feed 4/5 oz. per horse per day.

900-1100 lb. Horse Feed 1 oz. per horse per day.

1100-1300 lb. Horse Feed 1 1/5 oz. per horse per day

For larger horses over 1,300 lbs. of body weight or draft horses, feed an additional ½ oz. for each additional 200 lbs. of body weight.

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Active Ingredients:

Diflubenzuron (CAS# 35367-38-5): 0.24%