Break the Fly Life Cycle

Get a jump start on fly control. Start your horse on SimpliFly Feed-Thru Fly Control with LarvaStop early in the spring and continue throughout the summer until cold weather restricts fly activity. Break the fly life cycle by preventing the development into mature adults.

  • Prevents development of house and stable flies in manure when horses are continually treated
  • Highly palatable; just add to horse's feed
  • Contains no organophosphates
  • Only equine feed-thru fly control granted reduced-risk pesticide status by the EPA
  • Contains Diflubenzuron
  • Available in 3.75 lb., 10 lb., 20 lb. and 50 lb. sizes


Directions for Use

It is a violation of Federal law to use this product in a manner inconsistent with its labeling.


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 that 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.

Farnam SimpliFly Feed-Thru Fly Control should be used as part of an integrated, pest-management program aimed at reducing fly populations in the horse's environment. Consult your retailer for program recommendations. In order to achieve optimum fly control, this product should be used in conjunction with other premise and on-animal products as well as good management and sanitation practices.

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 1/5 oz. for each additional 200 lbs. of body weight.

The No Fly Zone is Farnam’s system for keeping your horse comfortable and happy. See below for more information on how to create your own No Fly Zone!