Beef Feedlot

On beef feedlots, producers’ profits are directly tied to efficient weight gain. Because fly infestations cause significant reductions in performance, they can have considerable effects on an operation’s bottom line. This is especially true given the rate at which infestations spread; as a result of having so many animals within close proximity to one another, flies move rapidly throughout facilities. It should come as no surprise then that fly control on beef feedlots must be proactive.

A feed-through insect growth regulator (IGR) like ClariFly® Larvicide presents an effective method for controlling fly populations by preventing fly larvae from becoming adults. When recommending a feed through to producers, it is important to inform them that ClariFly® Larvicide is not a “silver bullet” for fly control; it should only be one part of a multi-faceted fly control program. Additionally, for the feed through to be effective it is essential that all animals on the facility are treated.

Next Steps

Understanding the Problem

Fly populations on beef feedlots are largely unavoidable at certain times of they year. The main species present are house flies and stable flies.

As vectors for both human and cattle diseases, house flies threaten cattle health by spreading diseases. They also expose employees working on the feedlot to diseases such as E. Coli and Salmonella. Additionally, house-fly populations can spread to neighboring operations and homes, thus becoming a nuisance to the entire community.

Stable flies are the most economically-damaging species present on a beef feedlot. These biting flies cause discomfort amongst cattle, which in turn leads animals to “stomp” their feet and neglect regular eating schedules. They will also cause cattle to bunch together, which leads to additional heat stress. As a result of all of these factors, infestations can cause reductions in weight gain of up to 20 pounds per head. To spot a stable fly infestation, encourage producers to look for cattle that are bunched together. Point out that stable fly populations of as little as five per leg can cause losses.

Learn more about house flies and house fly control  by clicking on this icon. Feed-through fly control starts with understanding the problem.

House Fly

  • Feeds freely on human food, fresh animal waste and rotting garbage
  • Prefers manure and warm decaying organic matter as breeding sources
  • Implicated in the transmission of more than 65 disease organisms, including the bacteria that cause mastitis
Understand horn flies, their feeding habits and the reasons why horn fly control is so essential for on operations by clicking this horn fly icon.

Stable Fly

  • Feeds on blood, inflicting painful bites on a variety of animals, including humans
  • Breeds in rotting vegetation, urine-soaked bedding and manure/vegetation mixtures
  • Shown to cause reductions in proper weight gain
Next Steps

Fly Management Through IPM

Effective control of flies on a beef feedlot is dependent on a complete integrated pest management (IPM) program. In addition to a feed through, an IPM program incorporates several routine practices and control methods that help keep fly populations in check and below an established economic threshold.

Building an IPM program can be broken down into three phases; planning, implementation and evaluation.

Click on the pie chart below to learn more.

Pie Chart
When it comes to executing an integrated pest management program (IPM)on a beef feedlot, planning is key. Click here to get best practices. To ensure the success of an integrated pest management (IPM) program, evaluation of methods used is necessary. Click here for best evaluation practices. Tricks for implementing an integrated pest management (IPM) program will help operators make the most of feed-through products like ClariFly Larvicide.

For a more detailed look at IPM, download our Integrated Pest Management program planning guide.

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How Feed-Through Products Work

Conventional insecticides – often referred to as adulticides – kill flies by attacking their nervous systems. Feed-through products such as ClariFly® Larvicide work by interrupting the fly’s life cycle rather than through direct toxicitiy. The active ingredient in ClariFly® Larvicide specifically targets flies in the larval stages of pupation by disrupting the proper development of an exoskeleton. Without an exoskeleton, flies are unable to survive into adulthood.

When a feed through like ClariFly® Larvicide is mixed into feed or feed supplements, cattle ingest it as part of their daily diet. It then passes through the animals’ digestive systems and ends up in their manure, where flies lay eggs. It is here that the fly life cycle is ended. Use of ClariFly® Larvicide can result in a more than 96% reduction in fly emergence in treated manure*.

For best results, ClariFly® Larvicide should be added to your feed supplement 30 days before fly emergence (typically when average daily temperatures reach 65 degrees) and continued throughout the season until 30 days after the first frost. To learn more about the 30/30 program, download our 30/30 White Paper.

*Data on file.

This diagram shows how feed-through fly control products like ClariFly Larvicide provide fly control for cattle on beef feedlots by passing into manure. Next Steps

ClariFly® Larvicide Formulations

Selecting the right formulation of feed-through control is the key to effectiveness. It is dependent on the size of the operation and the intensity of the fly problem. ClariFly® Larvicide can be custom blended into a feedlot diet when requested.

To find out which product best suits your needs, contact your ClariFly® Larvicide representative to get more information.

To learn more about these formulations, visit

ClariFly® Larvicide Formulations:

  • ClariFly® Larvicide Livestock Premix 0.67% - Premixed into feed with a .67% active ingredient level (also available for custom blending).
  • ClariFly® Larvicide Livestock Premix 0.04% - Premixed into feed with a .04% active ingredient level.
Next Steps

Become Certified

This is an opportunity to become certified in Centralized Fly Control. By no means an official designation, Centralized Fly Control Certification will improve your feed-through knowledge so you can provide your customers with accurate product knowledge and expertise in how to control flies across a variety of livestock markets.

Become Certified